Urea-based animal feed additive and preparation method thereof

Abstract

The invention relates to the technical field of animal feed additives, in particular to a urea-based animal feed additive and a preparation method thereof. The urea-based animal feed additive comprises the following raw materials: an inner core, a shell material, an adhesion liquid and a coating material, and the mass ratio of the inner core to the shell material to the adhesion liquid to the coating material is 1: 0.1: 0.1: 0.5; the inner core is prepared from the following raw materials in percentage by weight: 4 to 6 percent of kelp powder, 4 to 6 percent of lysine, 2 to 4 percent of soybean oil, 2 to 4 percent of cellulase, 4 to 6 percent of calcium bicarbonate, 14 to 18 percent of trace element premix, 14 to 18 percent of compound vitamin and the balance of corn flour. The dairy cow feed is relatively sufficient in nutrition supplement for dairy cows, meets the requirements of dairy cow feeding on nutrient substances, enables the physical functions of the dairy cows to be relatively active, and further plays a role in increasing the milk yield.

Description

Technical Field

[0001] The invention relates to the technical field of animal feed additives, in particular to a urea-based animal feed additive and a preparation method thereof. Background Art

[0002] Feed additives are additives used as additional additives in the production and processing of animal feed. Their main raw materials are various nutrients that meet the growth needs of animals. They can improve feed quality and promote animal growth.

[0003] In the prior art, when animal feed additives are used to feed dairy cows, after the dairy cows eat the additives, the additives will first enter the rumen of the cow for fermentation, and then enter the abomasum for digestion after passing through the rumination, reticulum, and omasum. During this digestion process, the nutrients in the additives will be decomposed in the fermentation environment, and the abomasum, as a stomach that secretes digestive enzymes to substantially digest the nutrients, can only receive part of the nutrients to supply the dairy cow, resulting in defects in the nutritional supplementation of the dairy cow, which affects the milk production. Based on this, the present invention provides a urea-based animal feed additive and a preparation method thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a urea-based animal feed additive and a preparation method thereof. The urea-based animal feed additive prepared by the present invention can increase the milk production of dairy cows, which means that the urea-based animal feed additive can provide a more effective nutritional supply for dairy cows and effectively improve the use performance of the urea-based animal feed additive.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a urea-based animal feed additive, comprising the following raw materials: an inner core, a shell material, an attachment liquid and a coating material, wherein the mass ratio of the inner core, the shell material, the attachment liquid and the coating material is 1:0.1:0.1:0.5;

[0007] The raw materials of the inner core are corn flour, kelp powder, lysine, soybean oil, cellulase, calcium hydrogen phosphate, trace element premix, and multivitamin. The weight percentages of the raw materials of the inner core are: 4-6% kelp powder, 4-6% lysine, 2-4% soybean oil, 2-4% cellulase, 4-6% calcium hydrogen carbonate, 14-18% trace element premix, 14-18% multivitamin, and the balance is corn flour.

[0008] The raw materials of the shell material are composed of hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate, the mass of the triethyl citrate is 8-10% of the mass of the hydroxypropyl methylcellulose phthalate, and the mass of the calcium stearate is 4-6% of the mass of the hydroxypropyl methylcellulose phthalate;

[0009] The raw materials of the attachment liquid are composed of starch, honey and water, and the mass ratio of the starch, honey and water is 1: (0.2-0.4): 3;

[0010] The raw materials of the coating material are composed of urea and urea phosphate, and the mass of the urea phosphate is 1-3% of the mass of the urea.

[0011] Furthermore, the trace element premix consists of equal amounts of iron, zinc, manganese, copper, selenium and iodine.

[0012] Furthermore, the vitamin complex consists of equal amounts of vitamin A, vitamin C, vitamin D, and vitamin E.

[0013] Furthermore, the trace element premix and the vitamin complex are pretreated before the inner core is prepared, and the pretreatment method is a grinding process, and after the grinding process, the premix and the vitamin complex are sieved with 300 meshes.

[0014] Furthermore, the inner core is prepared by the following method: corn flour, kelp powder, lysine, soybean oil, cellulase, and calcium hydrogen phosphate are added to a mixer, the mixer is set to 200-300 r / min for mixing for 6-8 minutes, the pretreated trace element premix and multivitamin are added to the mixer, the mixer is set to 200-300 r / min for mixing for 10-12 minutes, and a mixture is obtained.

[0015] Furthermore, the mixture is added into a granulator, and the temperature of the feeding end of the granulator is set to 150-160°C, the temperature of the discharging end is set to 180-190°C, the screw speed is set to 50-60r / min, the granulation diameter is set to 1.5mm, the pelletizing length is set to 1.5mm, and after the granulation is completed, it is waited to cool to room temperature to obtain the inner core.

[0016] Furthermore, the shell material is prepared by the following method: the hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate are added into a mixer, and the mixer is set at 160-200 r / min for mixing for 20-30 minutes to prepare the shell material.

[0017] Furthermore, the attachment liquid is prepared by the following method: starch, honey and water are added into a container and stirred evenly for use, and the attachment liquid is stirred evenly before use.

[0018] Furthermore, the coating material is prepared by the following method: the urea is selected as slow-release urea, the urea and urea phosphate are ground into powder, the ground powder is sieved through 300 mesh, the ground urea and urea phosphate are evenly mixed to prepare the coating material.

[0019] In a second aspect, the present invention further provides a method for preparing a urea-based animal feed additive, comprising the following steps:

[0020] S1: The inner core is added to the coating machine, and preheated to 40-50°C after the inner core is added. The preheating time is 12-16 minutes. The coating machine is set to have an inlet temperature of 50-60°C and an inlet volume of 10-20m 3 / h, the spray gun pressure is 0.3-0.5MPa, the spray speed is 18-22ml / min, the spray gun outputs the shell material and sprays it onto the surface of the inner core. After the spraying is completed, the coating machine is set to 50-60°C for drying for 40-60min to obtain the first granular material;

[0021] S2: The pellets are added to the uniformly mixed attachment liquid. After sufficient mixing, the surface of the pellets is covered with the attachment liquid. The coating material is added and mixed uniformly to obtain a second pellet. The second pellet is sent to an oven and dried at 30 to 40° C. for 10 to 20 minutes to obtain a urea-based animal feed additive.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, the inner core, shell material, attachment liquid and coating material are prepared in the process of preparing the animal feed additive, wherein the inner core is used as the main nutrient supply material, and the shell material is coated on the inner core, and the shell material is attached to the outer layer of the inner core to form a coating layer. Through the setting of the coating layer, after feeding into the digestive system of the cattle, the inner core with a smaller particle size can avoid being directly chewed and broken, and the shell material made of hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate can maintain a stable state in the rumen and rumination of the cattle, and the hydroxypropyl methylcellulose phthalate with good flexibility and strength can be used as the feed additive. Cellulose phthalate can avoid damage when passing through the reticulum and omasum, so that the inner core can smoothly enter the abomasum of the cow under the protection of the coating layer. The coating layer is digested by the corrosion of gastric acid in the abomasum, and the inner core can be completely digested in the abomasum. At this time, the rich nutrients in the inner core are absorbed by the abomasum and enter the blood circulation, so that the nutrients contained in the feed additives are fully absorbed by the cow, which is a more sufficient nutritional supplement for the cow, meets the nutrient needs of the cow for feeding, makes the cow's body functions more active, and thus achieves the purpose of increasing milk production.

[0024] 2. In the present invention, by using the attachment liquid, urea and urea phosphate can be evenly adhered to the surface of the feed additive. After the feed additive is eaten by the cow, the feed additive enters the rumen, and the urea and urea phosphate fall off under the high humidity environment and the action of saliva. Urea is used as a nitrogen source to provide raw materials for protein synthesis for microorganisms in the rumen of the cow. By adding urea phosphate, the decomposition rate of urea by the cow can be slowed down, so that the ammonia nitrogen concentration in the rumen of the cow is stably maintained at an appropriate level, which is beneficial to the growth of rumen microorganisms and protein synthesis in the cow. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] This embodiment provides a urea-based animal feed additive, comprising the following raw materials: an inner core, a shell material, an attachment liquid and a coating material, wherein the mass ratio of the inner core, the shell material, the attachment liquid and the coating material is 1:0.1:0.1:0.5;

[0027] The raw materials of the inner core are corn flour, kelp powder, lysine, soybean oil, cellulase, calcium hydrogen phosphate, trace element premix, and multivitamin. The weight percentages of the raw materials of the inner core are: 4-6% kelp powder, 4-6% lysine, 2-4% soybean oil, 2-4% cellulase, 4-6% calcium hydrogen carbonate, 14-18% trace element premix, 14-18% multivitamin, and the balance is corn flour.

[0028] The raw materials of the shell material are composed of hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate, the mass of triethyl citrate is 8-10% of the mass of hydroxypropyl methylcellulose phthalate, and the mass of calcium stearate is 4-6% of the mass of hydroxypropyl methylcellulose phthalate;

[0029] The raw materials of the attachment liquid are composed of starch, honey and water, and the mass ratio of starch, honey and water is 1: (0.2-0.4): 3;

[0030] The raw materials of the coating material are composed of urea and urea phosphate, and the mass of urea phosphate is 1-3% of the mass of urea.

[0031] In some embodiments, the trace element premix consists of equal amounts of iron, zinc, manganese, copper, selenium, and iodine.

[0032] In some embodiments, the vitamin complex consists of equal amounts of vitamin A, vitamin C, vitamin D, and vitamin E.

[0033] In some embodiments, the trace element premix and the multivitamin are pretreated before the inner core is prepared, and the pretreatment method is grinding, and after the grinding, the premix is ​​sieved through 300 mesh.

[0034] In some embodiments, the inner core is prepared by the following method: corn flour, kelp powder, lysine, soybean oil, cellulase, and calcium hydrogen phosphate are added to a mixer, the mixer is set to 200-300 r / min and the mixing process is carried out for 6-8 minutes, the pretreated trace element premix and multivitamin are added to the mixer, the mixer is set to 200-300 r / min and the mixing process is carried out for 10-12 minutes to obtain a mixture.

[0035] In some embodiments, the mixture is added to a granulator, and the temperature of the feed end of the granulator is set to 150-160°C, the temperature of the discharge end is set to 180-190°C, the screw speed is set to 50-60r / min, the granulation diameter is 1.5mm, the pelletizing length is 1.5mm, and after granulation is completed, wait for cooling to room temperature to obtain the inner core.

[0036] In some embodiments, the shell material is prepared by the following method: hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate are added to a mixer, and the mixer is set at 160-200 r / min and mixed for 20-30 minutes to prepare the shell material.

[0037] In some embodiments, the attachment liquid is prepared by the following method: starch, honey and water are added into a container and stirred thoroughly for use. The attachment liquid is stirred thoroughly before use.

[0038] In some embodiments, the coating material is prepared by the following method: urea is selected as slow-release urea, urea and urea phosphate are ground into powder, the ground powder is sieved through 300 mesh, and the ground urea and urea phosphate are evenly mixed to prepare the coating material.

[0039] In some embodiments, a method for preparing a urea-based animal feed additive comprises the following steps:

[0040] S1: The inner core is added to the coating machine, and preheated to 40-50°C after the inner core is added. The preheating time is 12-16 minutes. The coating machine is set to have an inlet temperature of 50-60°C and an inlet volume of 10-20m 3 / h, the spray gun pressure is 0.3-0.5MPa, the spray speed is 18-22ml / min, the spray gun outputs the shell material and sprays it onto the surface of the inner core. After the spraying is completed, the coating machine is set to 50-60°C for drying for 40-60min to obtain the first granular material;

[0041] S2: The pellets are added to the uniformly mixed attachment liquid. After sufficient mixing, the surface of the pellets is covered with the attachment liquid. The coating material is added and mixed uniformly to obtain the second pellets. The second pellets are sent to an oven and dried at 30-40° C. for 10-20 minutes to obtain a urea-based animal feed additive.

[0042] In this embodiment, the inner core, shell material, attachment liquid and coating material are prepared in combination during the preparation of animal feed additives, wherein the inner core is used as the main nutrient supply material, and the shell material is used to coat the inner core, and the shell material is attached to the outer layer of the inner core to form a coating layer. Through the setting of the coating layer, after feeding and entering the digestive system of the cow, the inner core with a smaller particle size can avoid being directly chewed and broken, and at the same time, the shell material made of hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate can maintain a stable state in the rumen and rumination of the cow, and the hydroxypropyl methylcellulose phthalate with good flexibility can avoid damage when passing through the reticulum and omasum, so that the inner core can smoothly enter the abomasum of the cow under the protection of the coating layer, and the coating layer is digested and digested by the corrosion of gastric acid in the abomasum, and the inner core can be completely digested in the abomasum. At this time, the inner core is rich in The nutrients absorbed by the abomasum enter the blood circulation, so that the nutrients contained in the feed additives are fully absorbed by the cows, which is a more sufficient nutritional supplement for the cows, meets the cows' feeding needs for nutrients, makes the cows' body functions more active, and thus achieves the purpose of increasing milk production. Through the use of attachment liquid, urea and urea phosphate can be evenly adhered to the surface of the feed additives. After the feed additives are eaten by the cows, the feed additives enter the rumen, and the urea and urea phosphate fall off under the high humidity environment and the action of saliva. Urea is used as a nitrogen source to provide raw materials for protein synthesis for microorganisms in the rumen of dairy cows. The addition of urea phosphate can slow down the decomposition rate of urea by dairy cows, so that the ammonia nitrogen concentration in the rumen of dairy cows is stably maintained at an appropriate level, which is beneficial to the growth of rumen microorganisms and protein synthesis in dairy cows.

[0043] Based on the above embodiments, the following experiments were performed:

[0044] It should be noted that the raw materials used in the following experiments are all commercially available raw materials.

[0045] Experiment 1:

[0046] Raw material preparation: inner core, shell material, attachment liquid and coating material, the mass ratio of inner core, shell material, attachment liquid and coating material is 1:0.1:0.1:0.4;

[0047] The raw materials of the inner core are corn flour, kelp powder, lysine, soybean oil, cellulase, calcium hydrogen phosphate, trace element premix, and multivitamin. The weight percentages of the raw materials of the inner core are: 4% kelp powder, 4% lysine, 2% soybean oil, 2% cellulase, 4% calcium hydrogen carbonate, 14% trace element premix, 14% multivitamin, and the balance is corn flour. The trace element premix consists of equal amounts of iron, zinc, manganese, copper, selenium, and iodine. The multivitamin consists of equal amounts of vitamin A, vitamin C, vitamin D, and vitamin E.

[0048] The raw materials of the shell material are composed of hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate, the mass of triethyl citrate is 8% of the mass of hydroxypropyl methylcellulose phthalate, and the mass of calcium stearate is 4% of the mass of hydroxypropyl methylcellulose phthalate;

[0049] The raw materials of the attachment liquid are composed of starch, honey and water, and the mass ratio of starch, honey and water is 1:(0.2):3;

[0050] The raw materials of the coating material are composed of urea and urea phosphate, and the mass of urea phosphate is 1% of the mass of urea;

[0051] Before the inner core is prepared, the trace element premix and the multivitamin are pretreated by grinding, and then sifted through 300 meshes;

[0052] The inner core is prepared by the following method: corn flour, kelp powder, lysine, soybean oil, cellulase, and calcium hydrogen phosphate are added to a mixer, the mixer is set to 200 r / min for mixing for 6 minutes, the pretreated trace element premix and multivitamin are added to the mixer, the mixer is set to 200 r / min for mixing for 10 minutes to obtain a mixture, the mixture is added to a granulator, the granulator is set to a feed end temperature of 150° C., a discharge end temperature of 180° C., a screw speed of 50 r / min, a granulation diameter of 1.5 mm, a granulation length of 1.5 mm, and after granulation, waiting to cool to room temperature to obtain the inner core;

[0053] The shell material is prepared by the following method: hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate are added into a mixer, and the mixer is set at 160 r / min and mixed for 20 minutes to prepare the shell material;

[0054] The attachment liquid is prepared by the following method: starch, honey and water are added into a container and stirred evenly, and the attachment liquid is stirred evenly before use;

[0055] The coating material is prepared by the following method: urea is selected as slow-release urea, urea and urea phosphate are ground into powder, the ground powders are sieved through 300 meshes, and the ground urea and urea phosphate are evenly mixed to prepare the coating material;

[0056] Urea-based animal feed additive preparation:

[0057] S1: The inner core is added to the coating machine and preheated to 40°C for 12 minutes. The inlet air temperature of the coating machine is set to 50°C and the air volume is 10m 3 / h, the spray gun pressure is 0.3MPa, the spray speed is 18ml / min, the spray gun outputs the shell material and sprays it onto the surface of the inner core. After the spraying is completed, the coating machine is set to 50°C for drying for 40 minutes to obtain the first granular material;

[0058] S2: The pellets are added to the uniformly mixed attachment liquid. After sufficient mixing, the surface of the pellets is covered with the attachment liquid. The coating material is added and mixed uniformly to obtain the second pellets. The second pellets are sent to an oven and dried at 30°C for 10 minutes to obtain a urea-based animal feed additive.

[0059] Experiment 2:

[0060] Raw material preparation: inner core, shell material, attachment liquid and coating material, the mass ratio of inner core, shell material, attachment liquid and coating material is 1:0.1:0.1:0.5;

[0061] The raw materials of the inner core are corn flour, kelp powder, lysine, soybean oil, cellulase, calcium hydrogen phosphate, trace element premix, and multivitamin. The weight percentages of the raw materials of the inner core are: 5% kelp powder, 5% lysine, 3% soybean oil, 3% cellulase, 5% calcium hydrogen carbonate, 16% trace element premix, 16% multivitamin, and the balance is corn flour. The trace element premix consists of equal amounts of iron, zinc, manganese, copper, selenium, and iodine. The multivitamin consists of equal amounts of vitamin A, vitamin C, vitamin D, and vitamin E.

[0062] The raw materials of the shell material are composed of hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate, the mass of triethyl citrate is 9% of the mass of hydroxypropyl methylcellulose phthalate, and the mass of calcium stearate is 5% of the mass of hydroxypropyl methylcellulose phthalate;

[0063] The raw materials of the attachment liquid are composed of starch, honey and water, and the mass ratio of starch, honey and water is 1:(0.3):3;

[0064] The raw materials of the coating material are composed of urea and urea phosphate, and the mass of urea phosphate is 2% of the mass of urea;

[0065] Before the inner core is prepared, the trace element premix and the multivitamin are pretreated by grinding, and then sifted through 300 meshes;

[0066] The inner core is prepared by the following method: corn flour, kelp powder, lysine, soybean oil, cellulase, and calcium hydrogen phosphate are added to a mixer, the mixer is set to 250 r / min for mixing for 7 minutes, the pretreated trace element premix and multivitamin are added to the mixer, the mixer is set to 250 r / min for mixing for 11 minutes to obtain a mixture, the mixture is added to a granulator, the granulator is set to the feed end temperature of 155° C., the discharge end temperature of 185° C., the screw speed of 55 r / min, the granulation diameter of 1.5 mm, the pelletizing length of 1.5 mm, and after the granulation is completed, it is waited to cool to room temperature to obtain the inner core;

[0067] The shell material is prepared by the following method: hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate are added into a mixer, and the mixer is set at 180 r / min and mixed for 25 minutes to prepare the shell material;

[0068] The attachment liquid is prepared by the following method: starch, honey and water are added into a container and stirred evenly, and the attachment liquid is stirred evenly before use;

[0069] The coating material is prepared by the following method: urea is selected as slow-release urea, urea and urea phosphate are ground into powder, the ground powders are sieved through 300 meshes, and the ground urea and urea phosphate are evenly mixed to prepare the coating material;

[0070] Urea-based animal feed additive preparation:

[0071] S1: The inner core is added to the coating machine and preheated to 45°C after adding the inner core. The preheating time is 14 minutes. The coating machine is set to have an inlet temperature of 55°C and an inlet volume of 15m 3 / h, the spray gun pressure is 0.4MPa, the spray speed is 20ml / min, the spray gun outputs the shell material and sprays it onto the surface of the inner core. After the spraying is completed, the coating machine is set to 55°C for drying for 50min to obtain the first granular material;

[0072] S2: The pellets are added to the uniformly mixed attachment liquid. After sufficient mixing, the surface of the pellets is covered with the attachment liquid. The coating material is added and mixed uniformly to obtain the second pellets. The second pellets are sent to an oven and dried at 35°C for 15 minutes to obtain a urea-based animal feed additive.

[0073] Experiment 3:

[0074] Raw material preparation: inner core, shell material, attachment liquid and coating material, the mass ratio of inner core, shell material, attachment liquid and coating material is 1:0.1:0.1:0.5;

[0075] The raw materials of the inner core are corn flour, kelp powder, lysine, soybean oil, cellulase, calcium hydrogen phosphate, trace element premix, and multivitamin. The weight percentages of the raw materials of the inner core are: 6% kelp powder, 6% lysine, 4% soybean oil, 4% cellulase, 6% calcium hydrogen carbonate, 18% trace element premix, 18% multivitamin, and the balance is corn flour. The trace element premix consists of equal amounts of iron, zinc, manganese, copper, selenium, and iodine. The multivitamin consists of equal amounts of vitamin A, vitamin C, vitamin D, and vitamin E.

[0076] The raw materials of the shell material are composed of hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate, the mass of triethyl citrate is 10% of the mass of hydroxypropyl methylcellulose phthalate, and the mass of calcium stearate is 6% of the mass of hydroxypropyl methylcellulose phthalate;

[0077] The raw materials of the attachment liquid are composed of starch, honey and water, and the mass ratio of starch, honey and water is 1: (0.4):3;

[0079] The raw materials of the coating material are composed of urea and urea phosphate, and the mass of urea phosphate is 3% of the mass of urea;

[0080] Before the inner core is prepared, the trace element premix and the multivitamin are pretreated by grinding, and then sifted through 300 meshes;

[0081] The inner core is prepared by the following method: corn flour, kelp powder, lysine, soybean oil, cellulase, and calcium hydrogen phosphate are added to a mixer, the mixer is set to 300 r / min for mixing for 8 minutes, the pretreated trace element premix and multivitamin are added to the mixer, the mixer is set to 300 r / min for mixing for 12 minutes to obtain a mixture, the mixture is added to a granulator, the granulator is set to have a feed end temperature of 160° C., a discharge end temperature of 190° C., a screw speed of 60 r / min, a granulation diameter of 1.5 mm, a granulation length of 1.5 mm, and after granulation is completed, waiting to cool to room temperature to obtain the inner core;

[0082] The shell material is prepared by the following method: hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate are added into a mixer, and the mixer is set at 200 r / min and mixed for 30 minutes to prepare the shell material;

[0083] The attachment liquid is prepared by the following method: starch, honey and water are added into a container and stirred evenly, and the attachment liquid is stirred evenly before use;

[0084] The coating material is prepared by the following method: urea is selected as slow-release urea, urea and urea phosphate are ground into powder, the ground powders are sieved through 300 meshes, and the ground urea and urea phosphate are evenly mixed to prepare the coating material;

[0085] Urea-based animal feed additive preparation:

[0086] S1: The inner core is added to the coating machine and preheated to 50°C for 16 minutes. The inlet air temperature of the coating machine is set to 60°C and the air volume is 20m 3 / h, the spray gun pressure is 0.5MPa, the spray speed is 22ml / min, the spray gun outputs the shell material and sprays it onto the surface of the inner core. After the spraying is completed, the coating machine is set to 60℃ for drying for 60min to obtain the first granular material;

[0087] S2: The pellets are added to the uniformly mixed attachment liquid. After sufficient mixing, the surface of the pellets is covered with the attachment liquid. The coating material is added and mixed uniformly to obtain the second pellets. The second pellets are sent to an oven and dried at 40°C for 20 minutes to obtain a urea-based animal feed additive.

[0088] Comparative Example 1: The difference between this comparative example and Experiment 1 is that this comparative example does not contain trace element premix.

[0089] Comparative Example 2: The difference between this comparative example and Experiment 1 is that this comparative example does not contain multivitamins.

[0090] Comparative Example 3: The difference between this comparative example and Experiment 1 is that no coating material is added in this comparative example.

[0091] Comparative Example 4: The difference between this comparative example and Experiment 1 is that an equal amount of corn flour is used to replace the inner core in this comparative example.

[0092] Performance test: The urea-based animal feed additives prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were subjected to performance tests.

[0093] In the performance test, the main ingredients of the dairy cow feed were first prepared, and the main ingredient formula was 40% corn, 20% soybean meal, 15% bran, 20% alfalfa hay, and 5% bean cake. The urea-based animal feed additives prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were used to prepare dairy cow feeds. The amount of urea-based animal feed additives added was 3.5% of the mass of the main ingredient. Seven batches of dairy cows were fed with different dairy cow feeds prepared using urea-based animal feed additives prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4, with 5 dairy cows in each batch. On the 1st, 14th and 21st days of feeding, the total milk production of each batch of dairy cows (5 cows) was weighed and recorded to obtain milk production data. The obtained test data are recorded in the following table:

[0094]

[0095] By comparing and analyzing the relevant data in the table, it can be seen that the urea-based animal feed additive prepared by the present invention can increase the milk production of dairy cows, which shows that the urea-based animal feed additive can provide more effective nutrition supply for dairy cows. This shows that the urea-based animal feed additive and the preparation method thereof provided by the present invention have a broader market prospect and are more suitable for promotion.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0097] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A urea-based animal feed additive, characterized in that: The invention comprises the following raw materials: an inner core, a shell material, an attachment liquid and a coating material, wherein the mass ratio of the inner core, the shell material, the attachment liquid and the coating material is 1:0.1:0.1:0.5; The raw materials of the inner core are corn flour, kelp powder, lysine, soybean oil, cellulase, calcium hydrogen phosphate, trace element premix, and multivitamin. The weight percentages of the raw materials of the inner core are: 4-6% kelp powder, 4-6% lysine, 2-4% soybean oil, 2-4% cellulase, 4-6% calcium hydrogen carbonate, 14-18% trace element premix, 14-18% multivitamin, and the balance is corn flour. The raw materials of the shell material are composed of hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate, the mass of the triethyl citrate is 8-10% of the mass of the hydroxypropyl methylcellulose phthalate, and the mass of the calcium stearate is 4-6% of the mass of the hydroxypropyl methylcellulose phthalate; The raw materials of the attachment liquid are composed of starch, honey and water, and the mass ratio of the starch, honey and water is 1: (0.2-0.4): 3; The raw materials of the coating material are composed of urea and urea phosphate, and the mass of the urea phosphate is 1-3% of the mass of the urea.

2. The urea-based animal feed additive according to claim 1, characterized in that The trace element premix consists of equal amounts of iron, zinc, manganese, copper, selenium and iodine.

3. The urea-based animal feed additive according to claim 1, characterized in that The vitamin complex consists of equal amounts of vitamin A, vitamin C, vitamin D and vitamin E.

4. The urea-based animal feed additive according to claim 1, characterized in that Before the inner core is prepared, the trace element premix and the vitamin complex are pretreated by grinding, and the grinding is followed by sieving through 300 meshes.

5. The urea-based animal feed additive according to claim 1, characterized in that The inner core is prepared by the following method: corn flour, kelp powder, lysine, soybean oil, cellulase, and calcium hydrogen phosphate are added into a mixer, the mixer is set at 200-300 r / min for mixing for 6-8 minutes, pretreated trace element premix and complex vitamins are added into the mixer, the mixer is set at 200-300 r / min for mixing for 10-12 minutes, and a mixture is obtained.

6. The urea-based animal feed additive according to claim 5, characterized in that The mixed material is added into a granulator, and the temperature of the feeding end of the granulator is set to 150-160° C., the temperature of the discharging end is set to 180-190° C., the screw speed is set to 50-60 r / min, the granulation diameter is set to 1.5 mm, the pelletizing length is set to 1.5 mm, and after the granulation is completed, it is waited to cool to room temperature to obtain the inner core.

7. The urea-based animal feed additive according to claim 1, characterized in that The shell material is prepared by the following method: the hydroxypropyl methylcellulose phthalate, triethyl citrate and calcium stearate are added into a mixer, and the mixer is set at 160-200 r / min for mixing for 20-30 minutes to prepare the shell material.

8. The urea-based animal feed additive according to claim 1, characterized in that The attachment liquid is prepared by the following method: starch, honey and water are added into a container and stirred evenly for use, and the attachment liquid is stirred evenly before use.

9. The urea-based animal feed additive according to claim 1, characterized in that The coating material is prepared by the following method: the urea is selected as slow-release urea, the urea and urea phosphate are ground into powder, the ground powders are sieved through 300 meshes, and the ground urea and urea phosphate are evenly mixed to prepare the coating material.

10. A method for preparing a urea-based animal feed additive according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: The inner core is added to the coating machine, and preheated to 40-50°C after the inner core is added. The preheating time is 12-16 minutes. The coating machine is set to have an inlet temperature of 50-60°C and an inlet volume of 10-20m 3 / h, the spray gun pressure is 0.3-0.5MPa, the spray speed is 18-22ml / min, the spray gun outputs the shell material and sprays it onto the surface of the inner core. After the spraying is completed, the coating machine is set to 50-60°C for drying for 40-60min to obtain the first granular material; S2: The pellets are added to the uniformly mixed attachment liquid. After sufficient mixing, the surface of the pellets is covered with the attachment liquid. The coating material is added and mixed uniformly to obtain a second pellet. The second pellet is sent to an oven and dried at 30 to 40° C. for 10 to 20 minutes to obtain a urea-based animal feed additive.

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