Preparation method of sow feed capable of reducing ammonia nitrogen

Abstract

The invention provides a preparation method of a sow feed capable of reducing ammonia nitrogen, the feed comprises corn, soybean meal, rice bran, rapeseed cakes and additives, and the additives comprise yucca extract and compound probiotics; the specific preparation method comprises the following steps: step 1, crushing all the weighed component materials into fine powder of 1.0-2.0 mm, and putting the crushed materials into mixing equipment for mixing; step 2, adding an additive into the fine powder in the step 1, mixing and stirring, and granulating in a granulator; step 3, putting the screened feed into a dryer for vacuum low-pressure drying; the yucca extract comprises saponin, polysaccharide and polyphenol, and the compound probiotics comprise lactobacillus acidophilus, lactobacillus, lactic streptococci, bacillus licheniformis, bacillus subtillis and saccharomycetes. In actual use, the pig feed can relieve intestinal burden, improve the growth level of pigs and promote healthy growth.

Description

Technical Field

[0001] The invention relates to the technical field of feed, and in particular to a method for preparing sow feed containing reduced ammonia nitrogen. Background Art

[0002] The key to the level of pig farming lies in the level of sow farming; sow feeding is an important part of pig production, and sow feed directly affects the efficiency of pig farming. Improving the reproductive performance of sows by regulating nutrient intake and increasing the number of weaned piglets provided by sows per year is the most effective way to improve the level and efficiency of pig farming. Antibiotics have long been a key additive in sow feed.

[0003] The correct use of antibiotic feed additives in sow feed plays a positive role in promoting sow feed efficiency, preventing diseases, and improving piglet quality. In recent years, with the deepening of people's understanding of antibiotics and increasing attention to food safety, negative issues such as antibiotic resistance and residues have gradually become prominent. The feed in the prior art is easy to cause gastrointestinal burden on pigs after feeding. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing sow feed containing reduced ammonia nitrogen, which can reduce the intestinal burden, improve the growth level of pigs and promote healthy growth in actual use.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A method for preparing sow feed containing reduced ammonia nitrogen, the feed comprising corn, soybean meal, rice bran and vegetable cake, and the invention also comprises additives, the additives comprising lactobacillus, yucca extract and compound probiotics;

[0007] The specific preparation method is as follows:

[0008] Step 1, crush the weighed components into fine powder of 1.0-2.0 mm, and place the crushed materials in a mixing device for mixing;

[0009] Step 2, adding the additive to the fine powder in step 1, mixing and stirring, and then placing in a granulator for granulation;

[0010] Step 3, after screening, the feed is placed in a dryer for vacuum low-pressure drying;

[0011] Yucca extract includes saponins, polysaccharides and polyphenols, and the complex probiotics include Lactobacillus acidophilus, Lactobacillus, Streptococcus lactis, Bacillus licheniformis, Bacillus subtilis and yeast.

[0012] Among them, corn is 50-60 parts, soybean meal is 20-30 parts, rice bran is 35-40 parts, vegetable cake is 20-35 parts, and additives are 3-5 parts.

[0013] Furthermore, the yucca extract and the compound probiotics are mixed in a ratio of 1:2.

[0014] Preferably, the mass ratio of saponin, polysaccharide and polyphenol is 1:1-1.5:1-2.0.

[0015] Furthermore, the mass ratio of saponin, polysaccharide and polyphenol is 1:1.5:1.8.

[0016] Among them, the mass ratio of Lactobacillus acidophilus, Lactobacillus, Streptococcus lactis, Bacillus licheniformis, Bacillus subtilis and yeast is 1:1:1:1:1:1:1.

[0017] Furthermore, the granulator includes a stirring unit and a granulating unit. The stirring unit includes a shell, a connecting cylinder arranged at the lower end of the shell, and a stirring assembly arranged on the shell. The granulating unit is used to granulate the stirred and mixed materials.

[0018] The stirring assembly includes a stirring shaft, stirring blades arranged on the stirring shaft, and a first driving motor installed on the housing.

[0019] Furthermore, a spiral blade is provided on the stirring shaft at the position of the connecting cylinder, and the edge of the spiral blade contacts the edge of the connecting cylinder.

[0020] Wherein, a feed port is arranged on the outer shell, and a door for closing the feed port is arranged at the feed port.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention is mainly composed of corn, soybean meal, rice bran, vegetable cake and additives. In actual use, yucca extract and composite probiotics are added to feed to improve the intestinal absorption of pigs. Since the composite probiotics include Lactobacillus acidophilus, Lactobacillus, Streptococcus lactis, Bacillus licheniformis, Bacillus subtilis and yeast, when lactic acid bacteria ferment carbon sources, a large amount of lactic acid and acetic acid can be produced, and a small amount of formic acid, propionic acid, etc. can also be produced. These acidic metabolites are the main forces of lactic acid bacteria in antibacterial and antiseptic properties. In addition to reducing the pH value, lactic acid can also penetrate some bacterial cell membranes, inhibit the absorption of amino acids by the cell membrane and the activity of some respiratory enzyme systems, thereby achieving the purpose of inhibiting the growth and reproduction of microorganisms. It can restore the microecological balance of the animal intestine, form a barrier, inhibit the reproduction of pathogens, strengthen the body's immune function, inhibit the production of harmful substances, and purify the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the granulator of the present invention.

[0025] Figure 2 For the present invention Figure 1 A partial enlarged schematic diagram in the middle.

[0026] Reference numerals:

[0027] 101 stirring unit, 102 granulating unit, 103 connecting cylinder, 104 stirring assembly, 105 stirring shaft, 106 stirring blade, 107 first driving motor, 108 spiral blade, 109 feeding port, 110 bin door, 111 housing, 112 outer cylinder, 113 driving shaft, 114 first spiral blade, 115 cutting assembly, 116 cavity, 117 first driving motor, 118 feeding port, 119 discharging hole, 120 Driving unit, 121 mounting plate, 122 supporting plate, 123 pushing plate, 124 first return spring, 125 forming column, 126 through hole, 127 supporting block, 128 return assembly, 129 guide hole, 130 guide rod, 131 pulling rod, 132 second return spring, 133 nut, 134 driving motor, 135 cam, 136 cutting motor, 137 connecting shaft, 138 cutting knife, 139 making way hole, 140 guide surface. DETAILED DESCRIPTION

[0028] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0029] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0032] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] This embodiment discloses a method for preparing a sow feed containing reduced ammonia nitrogen, wherein the feed comprises corn, soybean meal, rice bran and vegetable cake, and this embodiment also comprises an additive, wherein the additive comprises yucca extract and compound probiotics;

[0036] The specific preparation method is as follows:

[0037] Step 1, crush the weighed components into fine powder of 1.0-2.0 mm, and place the crushed materials in a mixing device for mixing;

[0038] Step 2, adding the additive to the fine powder in step 1, mixing and stirring, and then placing in a granulator for granulation;

[0039] Step 3, after screening, the feed is placed in a dryer for vacuum low-pressure drying;

[0040] Yucca extract includes saponins, polysaccharides and polyphenols, and the complex probiotics include Lactobacillus acidophilus, Lactobacillus, Streptococcus lactis, Bacillus licheniformis, Bacillus subtilis and yeast.

[0041] Furthermore, 50-60 parts of corn, 20-30 parts of soybean meal, 35-40 parts of rice bran, 20-35 parts of vegetable cake, and 3-5 parts of additives.

[0042] In this embodiment, preferably, 55 parts of corn, 25 parts of soybean meal, 38 parts of rice bran, 30 parts of vegetable cake, and 4 parts of additives.

[0043] Among them, the mixing ratio of yucca extract and compound probiotics is 1:2.

[0044] Among them, yucca extract includes saponins, polysaccharides and polyphenols with a mass ratio of 1:1-1.5:1-2.0.

[0045] Furthermore, in the present application, the mass ratio of saponin, polysaccharide and polyphenol is 1:1.5:1.8.

[0046] Furthermore, the mass ratio of Lactobacillus acidophilus, Lactobacillus, Streptococcus lactis, Bacillus licheniformis, Bacillus subtilis and yeast is 1:1:1:1:1:1:1.

[0047] The present invention is mainly composed of corn, soybean meal, rice bran, vegetable cake and additives. In actual use, yucca extract and composite probiotics are added to feed to improve the intestinal absorption of pigs. Since the composite probiotics include Lactobacillus acidophilus, Lactobacillus, Streptococcus lactis, Bacillus licheniformis, Bacillus subtilis and yeast, when lactic acid bacteria ferment carbon sources, a large amount of lactic acid and acetic acid can be produced, and a small amount of formic acid, propionic acid, etc. can also be produced. These acidic metabolites are the main forces of lactic acid bacteria in antibacterial and antiseptic properties. In addition to reducing the pH value, lactic acid can also penetrate some bacterial cell membranes, inhibit the absorption of amino acids by the cell membrane and the activity of some respiratory enzyme systems, thereby achieving the purpose of inhibiting the growth and reproduction of microorganisms. It can restore the microecological balance of the animal intestine, form a barrier, inhibit the reproduction of pathogens, strengthen the body's immune function, inhibit the production of harmful substances, and purify the environment.

[0048] In the present application, the synergy between the yucca extract and the growth and metabolites of lactic acid bacteria results in better feed stability.

[0049] Furthermore, in actual use, lactobacilli include dead lactobacilli and live lactobacilli containing no less than 1 million / g.

[0050] Dead lactic acid bacteria, i.e. inactivated lactic acid bacteria, also play an important role. Inactivated lactic acid bacteria cannot reproduce, but cells and their fragments still exist. Lactic acid bacteria are Gram-positive bacteria, and their main components are peptidoglycan and a small amount of lipid substances. Peptidoglycan and lipoprotein make lactic acid bacteria adhere to the animal intestine. Inactivated lactic acid bacteria cells have exposed peptidoglycan on their surface, which makes them more adherent to the animal intestine, and their competitive exclusion is also stronger, which makes them more repellent to pathogenic bacteria.

[0051] When lactic acid bacteria ferment carbon sources, they can produce a large amount of lactic acid and acetic acid, as well as a small amount of formic acid, propionic acid, etc. These acidic metabolites are the main force of lactic acid bacteria's antibacterial and preservative effects.

[0052] In addition to lowering the pH value, lactic acid can also penetrate some bacterial cell membranes, inhibiting the cell membrane's absorption of amino acids and the activity of some respiratory enzymes, thereby achieving the purpose of inhibiting the growth and reproduction of microorganisms.

[0053] Lactobacillus produces lactic acid bacteria in the process of metabolism. It is a kind of polypeptide bacteriocin synthesized by ribosomes with bactericidal and antibacterial activity. It is generally a small molecule protein with positive charge. Lactobacillus is an antibacterial substance secreted by lactic acid bacteria. The effect of lactobacillus is similar to that of antibiotics, but the mechanism of action is different. It is specific and not easily destroyed by trypsin in the small intestine. It can effectively inhibit the growth of pathogens.

[0054] Lactobacillus is a mixed powder of lactic acid bacteria, polypeptides, macromolecular proteins, lanolin and its metabolites made by sterilizing pure milk, vacuum concentrating, inoculating lactic acid bacteria, fermenting and drying. Calculated on a dry basis, the total acid content in terms of lactic acid shall not be less than 10%, and the protein content shall not be less than 28%. Lactobacillus can directly kill and inhibit the reproduction of harmful bacteria, restore the microecological balance of the animal intestine, form a barrier, inhibit the reproduction of pathogens, and enhance the body's immune function.

[0055] Saponins have the properties of surfactants, which can improve the digestion and absorption of nutrients; saponins can improve the structure of the intestinal mucosa of animals, promote the growth and development of the intestinal mucosa, and enhance the absorption function of the intestine. Polysaccharides can regulate the structure of intestinal flora, and can combine with ammonia to produce non-toxic nitrogen compounds, which are used by intestinal microorganisms. Polyphenols have antibacterial, anti-inflammatory and antioxidant effects.

[0056] Yucca saponins have a broad-spectrum antibacterial effect: they have strong inhibitory effects on hemolytic Staphylococcus aureus, hemolytic Streptococcus, Pneumococcus, Shigella dysenteriae, Salmonella typhi, Salmonella paratyphi, Vibrio cholerae, Escherichia coli, Proteus, Pseudomonas aeruginosa, Bordetella pertussis and common pathogenic skin fungi.

[0057] Yucca has a significant control effect on the intestinal flora of animals, inhibiting the reproduction of protozoa and other harmful bacteria and promoting the massive reproduction of beneficial bacteria, thereby improving intestinal health and reducing the incidence of disease.

[0058] Yucca polyphenols have antibacterial and anti-inflammatory effects, can inhibit the expression of inflammatory factors, and reduce inflammatory reactions. They can reduce pets' tear spots, prevent pet arthritis, and improve the body's immunity. They also have antioxidant effects, which can help offset free radicals and protect body cells and tissues from damage. They can prolong the action time of other antioxidants in the body (such as VE and VC). They can prevent oxidation and damage to cell membranes, prevent water from flowing out of cells, and improve the water retention capacity of pork. They can also prevent fat oxidation, improve pork color, and increase pork pH, and are natural pork deacidifiers.

[0059] In actual use, the saponins in the yucca extract combine with the cholesterol on the coccidia cell membrane to form a complex, forming small holes on the cell membrane. There are a large number of cholesterol molecules on the coccidia cell membrane. Once bound by saponins, the cells will disintegrate and die. Therefore, yucca extract plays an important role in defending against coccidia, improving animal weight, reducing mortality and damage to the body. Coccidia infection can cause serious damage to animal tissues, and the antioxidant and anti-inflammatory effects of yucca polyphenols are beneficial to the recovery of tissue wounds.

[0060] The present invention can effectively improve the digestibility and utilization rate of nutrients and reduce the discharge of N and P; polysaccharides can combine with harmful gases such as ammonia and hydrogen sulfide, thereby reducing the emission of these harmful gases in feces; at the same time, most of the ammonia in animal excrement comes from the decomposition of urea, and saponins can reduce the decomposition of urea by reducing the activity of urease, thereby reducing the concentration of ammonia.

[0061] The feed prepared by the above method and conventional feed (Jinlefu 4% premix pig high-yielding lactating sow universal concentrated compound premixed nutrient feed) were fed, and the specific conditions were as follows:

[0062] project Control group Experimental Group Number of sows 10 10 Parity 2.9 2.8 Litter size (head) 10.1 10.9 Number of live piglets per litter (head) 9.3 10.4 Stillbirth rate (%) 7.9 4.6 Number of piglets weaned per litter 8.7 9.9 Pre-weaning piglet mortality (%) 6.5 4.8

[0063] The stillbirth rate and the mortality rate of piglets before weaning are significantly reduced when feeding the feed of the present invention.

[0064] See also Figure 1 and Figure 2The present invention also discloses a granulator structure, which includes a stirring unit 101 and a granulating unit 102. The stirring unit 101 includes a shell 111, a connecting tube 103 arranged at the lower end of the shell 111, and a stirring assembly 104 arranged on the shell 111. The granulating unit 102 is used to granulate the stirred and mixed materials.

[0065] The stirring assembly 104 includes a stirring shaft 105 , a stirring blade 106 disposed on the stirring shaft 105 , and a first driving motor 107 installed on a housing 111 .

[0066] Furthermore, a spiral blade 108 is provided on the stirring shaft 105 at the position of the connecting cylinder 103 , and the edge of the spiral blade 108 contacts the edge of the connecting cylinder 103 .

[0067] A feed port 109 is disposed on the outer shell 111 , and a door 110 for closing the feed port 109 is disposed at the feed port 109 .

[0068] In actual use, the fine powder material obtained after crushing needs to be mixed with additives to ensure the uniformity of the ingredients in the feed and improve the quality of the feed.

[0069] In the present application, the mixing unit 101 is provided to achieve mixing and stirring of the materials before granulation, so that the materials can be fully mixed to ensure that the quality of each feed after granulation is the same. The stirring component 104 is provided to fully stir the materials, and after stirring, the spiral blade 108 is used to forwardly rotate the materials to the granulation unit 102 for granulation, so as to achieve uniform feeding of the materials and prevent material blockage.

[0070] Furthermore, the granulation unit 102 includes an outer cylinder 112, a drive shaft 113, a first spiral blade 114 and a cutting assembly 115. The cavity 116 inside the outer cylinder 112 is large at one end and small at the other end. The drive shaft 113 is rotatably mounted on the outer cylinder 112. The drive shaft 113 is connected to a second drive motor 117. The first spiral blade 114 is arranged on the drive shaft 113. The edge of the first spiral blade 114 contacts the inner wall of the cavity 116 in the outer cylinder 112. A material port 118 is arranged on the outer cylinder 112, and the material port 118 is connected to the connecting cylinder 103.

[0071] A plurality of discharge holes 119 are provided at the end surface of the small end of the outer cylinder 112, and the cutting assembly 115 is used to cut the material extruded from the discharge holes 119 to form pellet feed.

[0072] Furthermore, a molding mechanism is arranged at the small end of the outer cylinder 112, and the molding mechanism includes a driving unit 120, a mounting plate 121, a support plate 122 and a push plate 123. The mounting plate 121 is slidably mounted on the outer cylinder 112, a first return spring 124 is arranged between the mounting plate 121 and the outer cylinder 112, the support plate 122 is fixedly mounted on the mounting plate 121 through a connecting rod, a molding column 125 is arranged on the support plate 122, the molding column 125 corresponds to the discharge hole 119 one by one, the diameter of the molding column 125 is smaller than the diameter of the discharge hole 119, a through hole 126 is arranged on the push plate 123, the molding column 125 passes through the through hole 126, so that the push plate 123 is slidably mounted on the molding column 125, and a support block 127 is arranged on the plate; a return assembly 128 is arranged between the push plate 123 and the support plate 122; the driving unit 120 is used to drive the mounting plate 121 to approach or move away from the end face of the outer cylinder 112.

[0073] In this way, in actual use, under the action of the driving unit 120, the forming column 125 can be extended into the discharge hole 119. When the material is squeezed out from the discharge hole 119, a depression is formed on the end surface of the material. When the driving unit 120 drives the mounting plate 121 to reset, under the action of the reset component 128, the push plate 123 moves to facilitate the separation of the material from the forming column 125. After separation, the cutting component 115 cuts the material.

[0074] The formed pellet feed has a depression at one end, which is convenient for subsequent rapid drying, improves the subsequent feed drying efficiency, and shortens the drying time.

[0075] The outer cylinder 112 is provided with a guide hole 129, the mounting plate 121 is provided with a guide rod 130, and the first return spring 124 is sleeved on the guide rod 130. This makes the mounting plate 121 more stable when moving.

[0076] Furthermore, the reset assembly 128 includes a pull rod 131, a second reset spring 132 and a nut 133. The pull rod 131 is fixedly disposed on the push plate 123. A first guide hole 129 is disposed on the support plate 122. The pull rod 131 passes through the first guide hole 129 and is connected to the nut 133. The second reset spring 132 is sleeved on the pull rod 131.

[0077] Furthermore, the driving unit 120 includes a driving motor 134 and a cam 135, wherein the driving motor 134 is connected to the cam 135, and the cam 135 contacts the mounting plate 121. Under the action of the first return spring 124, the mounting plate 121 contacts the cam 135. The mounting plate 121 is driven by the rotation of the cam 135.

[0078] Furthermore, the cutting assembly 115 includes a cutting motor 136, a connecting shaft 137 and a cutter 138. The cutting motor 136 is installed on the support plate 122. A clearance hole 139 is provided at the end of the driving shaft 113. One end of the connecting shaft 137 is installed in the clearance hole 139 through a linear bearing, and the other end is connected to the cutting motor 136. The cutter 138 is provided on the connecting shaft 137, and a clearance groove is provided on the end surface of the outer cylinder 112. When the mounting plate 121 is close to the outer cylinder 112, the cutter 138 is located in the clearance groove. When the mounting plate 121 is away from the outer cylinder 112, the cutter 138 leaves the clearance groove. At this time, the cutting motor 136 drives the connecting shaft 137 to rotate to achieve cutting of the material.

[0079] The connecting shaft 137 passes through the push plate 123 .

[0080] Furthermore, a guide surface 140 is provided on the side of the discharge hole 119 away from the mounting plate 121 , so that the material can enter the discharge hole 119 more smoothly after being squeezed in the outer cylinder 112 .

[0081] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a sow feed containing reduced ammonia nitrogen, the feed comprising corn, soybean meal, rice bran and vegetable cake, characterized in that: Also included is an additive, wherein the additive includes yucca extract and complex probiotics; The specific preparation method is as follows: Step 1, crush the weighed components into fine powder of 1.0-2.0 mm, and place the crushed materials in a mixing device for mixing; Step 2, adding the additive to the fine powder in step 1, mixing and stirring, and then placing in a granulator for granulation; Step 3, after screening, the feed is placed in a dryer for vacuum low-pressure drying; Yucca extract includes saponins, polysaccharides and polyphenols, and the complex probiotics include Lactobacillus acidophilus, Lactobacillus, Streptococcus lactis, Bacillus licheniformis, Bacillus subtilis and yeast.

2. The method for preparing a sow feed containing reduced ammonia nitrogen according to claim 1, characterized in that: 50-60 parts of corn, 20-30 parts of soybean meal, 35-40 parts of rice bran, 20-35 parts of vegetable cake, and 3-5 parts of additives.

3. The method for preparing a sow feed containing reduced ammonia nitrogen according to claim 2, characterized in that: The mixing ratio of yucca extract and complex probiotics is 1:

2.

4. The method for preparing a sow feed containing reduced ammonia nitrogen according to claim 2, characterized in that: Yucca extract includes saponins, polysaccharides and polyphenols with a mass ratio of 1:1-1.5:1-2.

0.

5. The method for preparing a sow feed containing reduced ammonia nitrogen according to claim 4, characterized in that: The mass ratio of saponin, polysaccharide and polyphenol is 1:1.5:1.

8.

6. The method for preparing a sow feed containing reduced ammonia nitrogen according to claim 4, characterized in that: The mass ratio of Lactobacillus acidophilus, Lactobacillus, Streptococcus lactis, Bacillus licheniformis, Bacillus subtilis and yeast is 1:1:1:1:1:1:

1.

7. A method for preparing sow feed containing reduced ammonia nitrogen according to any one of claims 1 to 6, characterized in that: The granulator comprises a stirring unit and a granulating unit. The stirring unit comprises a shell, a connecting cylinder arranged at the lower end of the shell and a stirring assembly arranged on the shell. The granulating unit is used for granulating the stirred and mixed materials.

8. The method for preparing a sow feed containing reduced ammonia nitrogen according to claim 7, characterized in that: The stirring assembly comprises a stirring shaft, a stirring blade arranged on the stirring shaft and a first driving motor installed on a housing.

9. The method for preparing a sow feed containing reduced ammonia nitrogen according to claim 8, characterized in that: A spiral blade is arranged on the stirring shaft at the position of the connecting cylinder, and the edge of the spiral blade contacts the edge of the connecting cylinder.

10. The method for preparing a sow feed containing reduced ammonia nitrogen according to claim 7, characterized in that: The outer shell is provided with a feed inlet, and a door for closing the feed inlet is provided at the feed inlet.

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