Fattening pig feed added with feed lard and preparation method of fattening pig feed

Abstract

The invention discloses a fattening pig feed added with feed lard and a preparation method of the fattening pig feed. The feed is prepared from the following raw materials in parts by weight: 560.7 to 587.2 parts of corn, 150 to 165 parts of soybean meal, 85 to 105 parts of wheat middling, 50 to 80 parts of rice bran meal, 30 to 47 parts of corn germ meal, 15 to 25 parts of cottonseed meal, 11 to 14 parts of mountain flour, 2 to 2.5 parts of sodium chloride, 5 to 8 parts of calcium hydrogen phosphate, 5 to 10 parts of soybean oil, 15 to 25 parts of compound vitamin liposome and 0.9 to 1.1 parts of trace element mixed feed, the lard oil is compounded with the soybean oil, so that the addition amount of the soybean oil is reduced. Meanwhile, the lard oil and the vitamins are added into the feed in the form of lipidosome, so that rancidity of the lard oil can be avoided, and the vitamin lipidosome is added into the pig feed, so that the bioavailability of the vitamins can be remarkably improved, the healthy growth and reproductive performance of pigs are promoted, and related diseases are prevented.

Description

Technical Field

[0001] The invention relates to the technical field of feed, and in particular to a fattening pig feed added with lard and a preparation method thereof. Background Art

[0002] Pork not only provides people with abundant protein and nutrition, but is also an important source of energy for people. As people's living standards continue to improve, the requirements for pork quality are also increasing. In traditional breeding methods, how to improve the production performance of pigs has also become the exploration direction of many colleagues in the industry. Many studies have shown that the balance of fatty acids in the diet can affect the body's fat composition, metabolism and deposition. Adding oil to animal diets has a good improvement in increasing daily weight gain, improving palatability, and anti-stress ability.

[0003] Adding oil to pig feed can not only improve the nutritional level of the diet, but also ensure the balance of energy and eggs in the diet, and improve the production performance of pigs. Zhang Huawei et al.'s study in the Journal of Feed Research (2007) showed that adding 5%-6% oil to the diet of weaned piglets increased the weight gain of weaned piglets while reducing feed consumption by 7%-15%. Cai Zhen et al.'s study in the Journal of Modern Animal Husbandry (2010) showed that adding 3% vegetable oil to the piglet diet has a good effect on improving the growth performance of nursery pigs, and vegetable oil can significantly affect the daily weight gain and feed conversion rate of piglets. Zhang Zengying et al.'s study in the Journal of Feed and Animal Husbandry (2001) found that adding 2.7%-3.5% of mixed oil, palm oil and soybean oil to the diet of fattening pigs increased the weight of pigs by 6.79%-7.06%, thereby reducing the feed-to-meat ratio by 4.22%-5.72%. Mu Xiaofeng et al., Anhui Agricultural Science Journal (2007) found that adding fat to pig diets improves feed utilization, promotes pig growth, and shortens the feeding cycle. The results show that adding 3% and 5% fat in the early and middle stages of fattening can achieve the best daily weight gain, lean meat rate and feed conversion rate for fattening pigs.

[0004] The selection of oil raw materials by feed companies is always inseparable from basic requirements such as supply stability and cost-effectiveness. Most of them choose soybean oil as their first choice because of its stable product quality. However, with soybean oil prices remaining high and prices of livestock products such as pigs and poultry volatile or even falling in the feed consumption market, the problems of raw material costs and raw material technology substitution have become prominent. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a fattening pig feed added with lard and a preparation method thereof, wherein lard is used to reduce the amount of soybean oil used to reduce costs, and at the same time, lard is made into liposomes to avoid lard deterioration and improve the absorption rate of vitamin components.

[0006] One of the purposes of the present invention is achieved by the following technical solution:

[0007] A fattening pig feed with added lard, comprising the following raw materials in parts by weight: 560.7-587.2 parts of corn, 150-165 parts of soybean meal, 85-105 parts of wheat flour, 50-80 parts of rice bran meal, 30-47 parts of corn germ meal, 15-25 parts of cottonseed meal, 11-14 parts of stone powder, 2-2.5 parts of sodium chloride, 5-8 parts of calcium hydrogen phosphate, 5-10 parts of soybean oil, 15-25 parts of complex vitamin liposomes, and 0.9-1.1 parts of trace element mixed feed; wherein the raw materials of the vitamin liposomes include the following raw materials in parts by weight: 3-6 parts of soybean lecithin, 40-145 parts of lard, 10-15 parts of Tween, 20-30 parts of sucrose solution and 2-40 parts of complex vitamins; the mass concentration of sucrose in the sucrose solution is 10-20%; the complex vitamins include at least one of vitamin A, vitamin B, vitamin D, vitamin E, and vitamin K;

[0008] Wherein, the preparation method of the vitamin liposome comprises the following steps:

[0009] Soy lecithin, lard, Tween and multivitamins are dissolved in chloroform, the chloroform is removed to form a lipid film, and then sucrose solution is added and stirred to obtain vitamin liposomes.

[0010] The invention selects lard and soybean oil as the oil source of the feed. Lard has good flavor and good taste. Lard and soybean oil are compounded and used in sows and weaned piglets to achieve good effects, can improve the reproductive performance of sows, increase the lactation amount, and increase the birth weight and weaning weight of piglets; improve the palatability and daily weight gain of weaned piglets, and have no negative impact on the diarrhea rate of weaned piglets.

[0011] At the same time, the present invention replaces common cholesterol with lard to prepare liposomes, which are vesicle structures with double-layer phospholipid membranes, similar to the structure of the cell membrane of an animal body. This structure enables liposomes to be used as an effective delivery system, encapsulating active ingredients such as vitamins, protecting them from enzymatic hydrolysis in the digestive system, thereby improving their bioavailability. For pigs, vitamin liposomes can be more effectively absorbed by the intestines, enter the blood circulation, and be targeted and delivered to specific tissues or cells to meet the growth and metabolic needs of pigs. Most importantly, making lard into liposomes can prevent lard from becoming rancid and improve the shelf life of feed.

[0012] Specifically, the lard used in the present invention is feeding lard, which is made from fat, minced meat, intestinal oil, pig skin and other scraps produced during the slaughter of live pigs as raw materials, and is refined and processed into oil for producing feed. Most of the refining methods are mainly fire refining.

[0013] Preferably, the trace element mixed feed comprises the following components by weight: 4-5 parts of basic cupric chloride, 20-25 parts of ferrous sulfate monohydrate, 15-20 parts of zinc sulfate monohydrate, 9-10 parts of manganese sulfate monohydrate, 5-8 parts of calcium iodate, 5-7 parts of sodium selenite and 30-35 parts of calcium hydrogen phosphate.

[0014] More preferably, the trace element mixed feed comprises the following components in parts by weight: 4.8 parts of basic cupric chloride, 22.6 parts of ferrous sulfate monohydrate, 17.5 parts of zinc sulfate monohydrate, 9.4 parts of manganese sulfate monohydrate, 6 parts of calcium iodate, 6 parts of sodium selenite and 33.7 parts of calcium hydrogen phosphate.

[0015] Preferably, the vitamin complex comprises the following components in parts by weight: 3-4 parts of vitamin A, 1-1.5 parts of vitamin D3, 23-26 parts of vitamin E, 2-2.5 parts of vitamin K3, 2-2.5 parts of vitamin B2, 0.5-1 parts of vitamin B6, 0.8-1.2 parts of vitamin B12, 8-12 parts of niacinamide, 7-7.5 parts of calcium pantothenate and 1-1.5 parts of biotin.

[0016] More preferably, the vitamin complex comprises the following components in parts by weight: 3.25 parts of vitamin A, 1.3 parts of vitamin D3, 25 parts of vitamin E, 2.4 parts of vitamin K3, 2.2 parts of vitamin B2, 0.8 parts of vitamin B6, 1 part of vitamin B12, 10 parts of niacinamide, 7.3 parts of calcium pantothenate and 1.3 parts of biotin.

[0017] Preferably, the lard accounts for 0.8-1.2wt% of the total mass of the fattening pig feed.

[0018] Preferably, the trace element mixed feed also includes 45-50 portions of rice husk powder.

[0019] Preferably, in the method for preparing the vitamin liposome, soybean lecithin, lard, Tween and multivitamins are dissolved in chloroform under ultrasonic conditions of 20-30° C. and 30-35 KHz for 5-10 min.

[0020] Preferably, in the method for preparing the vitamin liposomes, the method for removing chloroform is rotary evaporation at 20-30° C. for 1-3 h.

[0021] The second object of the present invention is achieved by adopting the following technical solution:

[0022] The method for preparing the fattening pig feed with added lard comprises the following steps: mixing corn, soybean meal, soybean oil, wheat bran meal, rice bran meal, corn germ meal, cottonseed meal, stone powder, sodium chloride and calcium hydrogen phosphate, and then adding compound vitamin liposomes and trace element mixed feed to mix, so as to obtain the fattening pig feed with added lard.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention selects lard and soybean oil for compounding to reduce the amount of soybean oil added, because lard has high energy density, and adding it as a feed ingredient can significantly improve the energy level of the feed. This is particularly important for fast-growing pigs, because high-energy feed helps to meet the energy required for their growth and development. Feeding lard can not only improve the palatability of the diet, but also adjust the saturation of fatty acids when mixed with soybean oil, and improve the production performance of fattening pigs. At the same time, lard and vitamins are added to the feed in the form of liposomes, which can prevent lard from becoming rancid, and adding vitamin liposomes to pig feed can significantly improve the bioavailability of vitamins, promote the healthy growth and reproductive performance of pigs, and prevent the occurrence of related diseases. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0026] The sources of the raw materials used in the following examples and comparative examples are as follows:

[0027] Lard: from Guangzhou Baker Lianyou Feed Oil Co., Ltd.;

[0028] Unless otherwise specified, other materials, reagents, etc. used in the examples and comparative examples can be obtained from commercial sources.

[0029] Example 1

[0030] A fattening pig feed supplemented with lard, comprising the following raw materials by weight: 575 parts of corn, 155 parts of soybean meal, 90 parts of wheat flour, 60 parts of rice bran meal, 32 parts of corn germ meal, 17 parts of cottonseed meal, 12 parts of stone powder, 2.3 parts of sodium chloride, 6 parts of calcium hydrogen phosphate, 8 parts of soybean oil, 20 parts of multivitamin liposomes, and 1 part of trace element mixed feed;

[0031] The raw materials of the vitamin liposome include the following raw materials in parts by weight: 6 parts of soybean lecithin, 121.4 parts of lard, 12 parts of Tween 80, 28 parts of sucrose solution and 35 parts of multivitamins; the mass concentration of sucrose in the sucrose solution is 15%; that is, lard accounts for 1.2wt% of the mass of the total feed.

[0032] The trace element mixed feed comprises the following components by weight: 4.8 parts of basic copper chloride, 22.6 parts of ferrous sulfate monohydrate, 17.5 parts of zinc sulfate monohydrate, 9.4 parts of manganese sulfate monohydrate, 6 parts of calcium iodate, 6 parts of sodium selenite, 33.7 parts of calcium hydrogen phosphate and 46 parts of rice husk powder. The multivitamin comprises the following components by weight: 3.25 parts of vitamin A, 1.3 parts of vitamin D3, 25 parts of vitamin E, 2.4 parts of vitamin K3, 2.2 parts of vitamin B2, 0.8 parts of vitamin B6, 1 part of vitamin B12, 10 parts of nicotinamide, 7.3 parts of calcium pantothenate and 1.3 parts of biotin.

[0033] Wherein, the preparation method of the vitamin liposome comprises the following steps:

[0034] Soy lecithin, lard, Tween 80 and multivitamins were dissolved in chloroform at 25°C and 32KHz ultrasonic conditions for 6 minutes, and the chloroform was removed by rotary evaporation at 25°C for 2 hours to form a lipid film, and then sucrose solution was added and stirred to obtain vitamin liposomes.

[0035] The method for preparing the fattening pig feed with added lard comprises the following steps: mixing corn, soybean meal, soybean oil, wheat bran meal, rice bran meal, corn germ meal, cottonseed meal, stone powder, sodium chloride and calcium hydrogen phosphate, and then adding compound vitamin liposomes and trace element mixed feed to mix, so as to obtain the fattening pig feed with added lard.

[0036] Example 2

[0037] A fattening pig feed with added lard comprises the following raw materials in parts by weight: 560.7 parts of corn, 150 parts of soybean meal, 85 parts of wheat flour, 50 parts of rice bran meal, 30 parts of corn germ meal, 15 parts of cottonseed meal, 11 parts of stone powder, 2 parts of sodium chloride, 5 parts of calcium hydrogen phosphate, 5 parts of soybean oil, 15 parts of vitamin complex liposomes, and 0.9 parts of trace element mixed feed; wherein the raw materials of the vitamin liposomes comprise the following raw materials in parts by weight: 3 parts of soybean lecithin, 40 parts of lard, 10 parts of Tween 80, 20 parts of sucrose solution, and 2 parts of vitamin complexes; the mass concentration of sucrose in the sucrose solution is 10%; the trace element mixed feed comprises the following components in parts by weight: 4 parts of basic cupric chloride, 20 parts of ferrous sulfate monohydrate, 15 parts of zinc sulfate monohydrate, 9 parts of manganese sulfate monohydrate, 5 parts of calcium iodate, 5 parts of sodium selenite, 30 parts of calcium hydrogen phosphate, and 45 parts of rice husk powder. The multivitamin comprises the following components by weight: 4 parts of vitamin A, 1.5 parts of vitamin D3, 26 parts of vitamin E, 2.5 parts of vitamin K3, 2.5 parts of vitamin B2, 1 part of vitamin B6, 1.2 parts of vitamin B12, 12 parts of niacinamide, 7.5 parts of calcium pantothenate and 1.5 parts of biotin.

[0038] Wherein, the preparation method of the vitamin liposome comprises the following steps:

[0039] Soy lecithin, lard, Tween 80 and multivitamins were dissolved in chloroform at 20°C and 30KHz ultrasonic conditions for 10 minutes, and the chloroform was removed by rotary evaporation at 20°C for 3 hours to form a lipid film, and then sucrose solution was added and stirred to obtain vitamin liposomes.

[0040] The method for preparing the fattening pig feed with added lard comprises the following steps: mixing corn, soybean meal, soybean oil, wheat bran meal, rice bran meal, corn germ meal, cottonseed meal, stone powder, sodium chloride and calcium hydrogen phosphate, and then adding compound vitamin liposomes and trace element mixed feed to mix, so as to obtain the fattening pig feed with added lard.

[0041] Example 3

[0042] A fattening pig feed with added lard, comprising the following raw materials in parts by weight: 587.2 parts of corn, 165 parts of soybean meal, 105 parts of wheat flour, 80 parts of rice bran meal, 47 parts of corn germ meal, 25 parts of cottonseed meal, 14 parts of stone powder, 2.5 parts of sodium chloride, 8 parts of calcium hydrogen phosphate, 10 parts of soybean oil, 25 parts of complex vitamin liposomes, and 1.1 parts of trace element mixed feed; wherein the raw materials of the vitamin liposomes include the following in parts by weight: The raw materials are: 6 parts of soybean lecithin, 145 parts of lard, 15 parts of Tween 80, 30 parts of sucrose solution and 40 parts of multivitamins; the mass concentration of sucrose in the sucrose solution is 20%; the trace element mixed feed includes the following components by weight: 5 parts of basic copper chloride, 25 parts of ferrous sulfate monohydrate, 20 parts of zinc sulfate monohydrate, 10 parts of manganese sulfate monohydrate, 8 parts of calcium iodate, 7 parts of sodium selenite, 35 parts of calcium hydrogen phosphate and 50 parts of rice husk powder. The multivitamins include the following components by weight: 3 parts of vitamin A, 1 part of vitamin D3, 23 parts of vitamin E, 2 parts of vitamin K3, 2 parts of vitamin B2, 0.5 parts of vitamin B6, 0.8 parts of vitamin B12, 8 parts of nicotinamide, 7 parts of calcium pantothenate and 1 part of biotin.

[0043] Wherein, the preparation method of the vitamin liposome comprises the following steps:

[0044] Soy lecithin, lard, Tween 80 and multivitamins were dissolved in chloroform at 30°C and 30KHz ultrasonic conditions for 5 minutes, and the chloroform was removed by rotary evaporation at 30°C for 1 hour to form a lipid film, and then sucrose solution was added and stirred to obtain vitamin liposomes.

[0045] The method for preparing the fattening pig feed with added lard comprises the following steps: mixing corn, soybean meal, soybean oil, wheat bran meal, rice bran meal, corn germ meal, cottonseed meal, stone powder, sodium chloride and calcium hydrogen phosphate, and then adding compound vitamin liposomes and trace element mixed feed to mix, so as to obtain the fattening pig feed with added lard.

[0046] Example 4

[0047] The difference between Example 4 and Example 1 is that the raw materials of the vitamin liposomes include the following raw materials in parts by weight: 6 parts of soybean lecithin, 40.9 parts of lard, 12 parts of Tween 80, 108.5 parts of sucrose solution and 35 parts of multivitamins; the mass concentration of sucrose in the sucrose solution is 15%; that is, lard accounts for 0.4wt% of the mass of the total feed.

[0048] Example 5

[0049] The difference between Example 5 and Example 1 is that the raw materials of the vitamin liposome include the following raw materials in parts by weight: 6 parts of soybean lecithin, 81 parts of lard, 12 parts of Tween 80, 68.4 parts of sucrose solution and 35 parts of multivitamins; the mass concentration of sucrose in the sucrose solution is 15%; that is, lard accounts for 0.8wt% of the mass of the total feed.

[0050] Example 6

[0051] The difference between Example 6 and Example 1 is that the raw materials of the vitamin liposomes include the following raw materials in parts by weight: 6 parts of soybean lecithin, 141.7 parts of lard, 12 parts of Tween 80, 7.7 parts of sucrose solution and 35 parts of multivitamins; the mass concentration of sucrose in the sucrose solution is 15%; that is, lard accounts for 1.4wt% of the mass of the total feed.

[0052] Comparative Example 1

[0053] The difference between Comparative Example 1 and Example 1 is that: Comparative Example 1 does not add lard, but uses an equal amount of cholesterol instead.

[0054] Comparative Example 2

[0055] The difference between Comparative Example 2 and Example 1 is that: Comparative Example 2 does not add soybean oil, but uses an equal amount of lard instead.

[0056] Comparative Example 3

[0057] The difference between Comparative Example 3 and Example 1 is that: in Comparative Example 3, soybean oil and lard are not added, and cholesterol is used to replace lard.

[0058] Comparative Example 4

[0059] The difference between Comparative Example 4 and Example 1 is that the lard and multivitamins in Comparative Example 4 are directly added to the feed, that is, liposomes are not prepared.

[0060] Comparative Example 5

[0061] The difference between Comparative Example 5 and Example 1 is that the sucrose solution in the liposomes of Comparative Example 5 is replaced by pure water.

[0062] Performance Testing

[0063] Healthy lean fattening pigs of similar age and weighing 60±2kg were selected. During the experiment, feed was added once a day, and the pigs were free to eat and drink water. Disinfection, deworming and immunization were carried out according to the routine procedures of the pig farm. The experimental pig farm is a farm affiliated to Heishan County Zhongteng Breeding Pig Co., Ltd. Randomly divided into 12 treatment groups, each treatment was set up with 2 replicates, and the feeds of Examples 1-6 and Comparative Examples 1-5 were fed respectively. Maintain a good pigsty environment with suitable temperature and humidity. Immunization and disinfection of pigs follow the pig farm immunization procedure. The trial period is from October 16, 2023 (90 days of age) to November 30, 2023 (135 days of age), and the trial period is 45 days.

[0064] Each group was weighed after fasting for 2 h on the first day of the experiment and the second day after the end of the experiment. Feed consumption was recorded in replicates (pens), and the average daily feed intake (ADFI), average daily gain (ADG) and feed to gain ratio (F / G) were calculated.

[0065] Average daily gain (ADG) = (average weight at the end of the test - average weight at the beginning of the test) ÷ number of days in the test period;

[0066] Average daily feed intake (ADFI) = total feed consumption ÷ average number of heads in the experimental group ÷ experimental period;

[0067] Feed-to-weight ratio (F / G) = total feed consumption ÷ total weight gain. See Table 1 for specific data.

[0068] Table 1 Feeding data of each group of feed

[0069] Group / Performance Average daily weight gain (g / d) Average daily feed intake (g / d) Feed to meat ratio Example 1 936 2313 2.51 Example 2 852 2284 2.61 Example 3 910 2292 2.55 Example 4 865 2287 2.57 Example 5 930 2293 2.53 Example 6 928 2329 2.52 Comparative Example 1 824 2225 2.66 Comparative Example 2 830 2248 2.65 Comparative Example 3 806 2204 2.69 Comparative Example 4 836 2274 2.63 Comparative Example 5 839 2277 2.62

[0070] As can be seen from Table 1, the feed of Example 1 is the optimal embodiment, which can effectively promote the healthy growth of pigs. Example 1 and Examples 4-6 respectively explore the effect of the weight ratio of lard to the total feed on feed performance. 0. Combined with the data, when lard accounts for 0.4-1.2wt% of the total feed, the higher the proportion of lard, the better the palatability of the diet, and the better the effect on promoting the growth of pigs. However, if it exceeds 1.2wt%, the average daily growth rate will decrease. This is because the addition of too much lard will reduce the protein and sugar intake of pigs, thereby affecting the normal growth and development of pigs and causing a slowdown in growth. Therefore, it is preferred that lard accounts for 0.8-1.2wt% of the total feed weight.

[0071] Comparative Examples 1 and 2 do not add soybean oil and lard respectively, while Comparative Example 3 does not add soybean oil and lard. Combining the data of the above three groups with that of Example 1, it can be seen that soybean oil and lard have a synergistic effect, and the combination of the two can effectively improve the utilization rate of effective ingredients in feed by pigs.

[0072] Comparative Example 4 is to add lard and multivitamins directly to the feed. Because the feed is prepared before feeding, the lard of Comparative Example 4 directly added with lard becomes rancid after 45 days, thereby significantly reducing the absorption effect of the feed by the pigs. Therefore, the present invention makes lard into liposomes, which can avoid rancidity of lard and improve the shelf life of the feed.

[0073] Comparative Example 5 is to replace the sucrose solution with pure water in the liposome, and the feeding effect is reduced, because the osmotic pressure of the sucrose solution is close to that of normal saline, which can meet the needs of in vivo application. In the process of liposome preparation, suitable osmotic pressure helps to maintain the stability of liposomes and prevents them from breaking due to osmotic pressure differences. And the viscosity of the sucrose solution is relatively high, which helps to reduce the aggregation and fusion phenomenon of liposomes during preparation and storage. By increasing the viscosity of the solution, the steric hindrance between liposomes can be increased, thereby reducing the chance of their mutual contact and fusion. At the same time, sucrose, as a kind of carbohydrate, has certain anti-oxidation and reductivity. In the preparation and storage of liposomes, sucrose can protect liposomes from damage by oxidative stress and extend their shelf life.

[0074] In summary, the feed of the present invention reduces the usage of soybean oil by using lard, and uses liposomes to encapsulate lard and vitamins, which can improve the absorption rate and prevent lard from becoming rancid. The feed of the present invention can achieve good results when used in sows and weaned piglets, can improve the reproductive performance of sows, increase the amount of milk secretion, and increase the birth weight and weaning weight of piglets; improve the palatability and daily weight gain of weaned piglets, and has no negative impact on the diarrhea rate of weaned piglets.

[0075] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A fattening pig feed supplemented with lard, characterized in that: The invention comprises the following raw materials in parts by weight: 560.7-587.2 parts of corn, 150-165 parts of soybean meal, 85-105 parts of wheat flour, 50-80 parts of rice bran meal, 30-47 parts of corn germ meal, 15-25 parts of cottonseed meal, 11-14 parts of stone powder, 2-2.5 parts of sodium chloride, 5-8 parts of calcium hydrogen phosphate, 5-10 parts of soybean oil, 15-25 parts of complex vitamin liposomes, and 0.9-1.1 parts of trace element mixed feed; wherein the raw materials of the vitamin liposomes comprise the following raw materials in parts by weight: 3-6 parts of soybean lecithin, 40-145 parts of lard, 10-15 parts of Tween, 20-30 parts of sucrose solution and 2-40 parts of complex vitamins; the mass concentration of sucrose in the sucrose solution is 10-20%; the complex vitamins comprise at least one of vitamin A, vitamin B, vitamin D, vitamin E and vitamin K; Wherein, the preparation method of the vitamin liposome comprises the following steps: Soy lecithin, lard, Tween and multivitamins are dissolved in chloroform, the chloroform is removed to form a lipid film, and then sucrose solution is added and stirred to obtain vitamin liposomes.

2. The fattening pig feed with added lard as claimed in claim 1, characterized in that: The trace element mixed feed comprises the following components by weight: 4-5 parts of basic cupric chloride, 20-25 parts of ferrous sulfate monohydrate, 15-20 parts of zinc sulfate monohydrate, 9-10 parts of manganese sulfate monohydrate, 5-8 parts of calcium iodate, 5-7 parts of sodium selenite and 30-35 parts of calcium hydrogen phosphate.

3. The fattening pig feed with added lard as claimed in claim 1 or 2, characterized in that: The trace element mixed feed comprises the following components in parts by weight: 4.8 parts of basic cupric chloride, 22.6 parts of ferrous sulfate monohydrate, 17.5 parts of zinc sulfate monohydrate, 9.4 parts of manganese sulfate monohydrate, 6 parts of calcium iodate, 6 parts of sodium selenite and 33.7 parts of calcium hydrogen phosphate.

4. The fattening pig feed with added lard as claimed in claim 1, characterized in that: The complex vitamin comprises the following components in parts by weight: 3-4 parts of vitamin A, 1-1.5 parts of vitamin D3, 23-26 parts of vitamin E, 2-2.5 parts of vitamin K3, 2-2.5 parts of vitamin B2, 0.5-1 parts of vitamin B6, 0.8-1.2 parts of vitamin B12, 8-12 parts of nicotinamide, 7-7.5 parts of calcium pantothenate and 1-1.5 parts of biotin.

5. The fattening pig feed supplemented with lard as claimed in claim 1 or 4, characterized in that: The multivitamin comprises the following components by weight: 3.25 parts of vitamin A, 1.3 parts of vitamin D3, 25 parts of vitamin E, 2.4 parts of vitamin K3, 2.2 parts of vitamin B2, 0.8 parts of vitamin B6, 1 part of vitamin B12, 10 parts of niacinamide, 7.3 parts of calcium pantothenate and 1.3 parts of biotin.

6. The fattening pig feed with added lard as claimed in claim 1, characterized in that: The lard accounts for 0.5-1.2 wt% of the total weight of the fattening pig feed.

7. The fattening pig feed with added lard as claimed in claim 1, characterized in that: The trace element mixed feed also includes 45-50 portions of rice husk powder.

8. The fattening pig feed supplemented with lard as claimed in claim 1, characterized in that: In the preparation method of the vitamin liposome, soybean lecithin, lard, Tween and compound vitamins are dissolved in chloroform under ultrasonic conditions of 20-30° C. and 30-35 KHz for 5-10 minutes.

9. The fattening pig feed supplemented with lard as claimed in claim 1, characterized in that: In the method for preparing the vitamin liposome, the method for removing chloroform is to perform rotary evaporation at 20-30° C. for 1-3 hours.

10. The method for preparing a fattening pig feed supplemented with lard according to any one of claims 1 to 9, characterized in that: The following steps are involved: Corn, soybean meal, soybean oil, wheat flour, rice bran meal, corn germ meal, cottonseed meal, stone powder, sodium chloride and calcium hydrogen phosphate are mixed, and then multivitamin liposomes and trace element mixed feed are added and mixed to obtain the fattening pig feed added with feeding lard.