Pet food capable of improving peculiar smell of excrement and preparation method of pet food

Abstract

The invention discloses a pet food capable of improving peculiar smell of excrement and a preparation method of the pet food. The pet food comprises pet base food and a material mixing layer from inside to outside, the surface of the pet base food is wrapped with the material mixing layer, the pet base food comprises, by weight, 60-70 parts of pet base food and 30-40 parts of the material mixing layer, and the material mixing layer comprises, by weight, 60-70 parts of livestock and poultry viscera protein ferment powder, 10-15 parts of radix puerariae extract, 5-8 parts of animal grease and 5-10 parts of fructo-oligosaccharide. At least one isolating layer is arranged between the pet base food and the mixed material layer, and the weight of the isolating layer is 2-5% of the total weight of the pet food. The prepared pet food is of a multi-layer structure, the middle is of an isolation layer structure of a macroporous structure, the isolation layer adopts a radix paeoniae alba total saponin extract with deodorization and ammonia reduction effects, livestock and poultry viscera protein ferment powder is adopted in a mixing layer, livestock and poultry viscera protein is fermented and decomposed to obtain small molecule peptides and short-chain fatty acid, and the small molecule peptides and the short-chain fatty acid are mixed with the isolation layer. Peculiar smell in excrement of pets is reduced, palatability is good, and market application prospects are wide.

Description

Technical Field

[0001] The invention relates to the technical field of pet food-grade feed, and in particular to pet food capable of improving the peculiar smell of excrement and a preparation method thereof. Background Art

[0002] As the number of pets in my country increases year by year, the demand for pet food is also increasing. At present, the food for cats and dogs can not only provide the most basic life guarantee for pets, but also provide the nutrients needed for growth, development and health.

[0003] Pets produce odorous gases due to gastrointestinal indigestion, mainly including nitrogen compounds such as ammonia, methylamine, sulfides such as hydrogen sulfide, methyl mercaptan and aliphatic compounds such as indole, acrolein, skatole, methane, etc. The degradation of proteins and amino acids after the digestive tract can produce ammonia, and the concentration can exceed 1000mg / kg, but the odor perception concentration of ammonia is relatively high, and it is generally considered to be a relatively minor malodorous substance. However, the production of sulfur-containing compounds such as hydrogen sulfide and methyl mercaptan is less than that of ammonia, but the perceived concentration is very low, and it contributes greatly to the malodor. Therefore, a stronger malodor will be produced in pet excrement, and the breeder needs to clean up the feces in time to keep the environment fresh.

[0004] Studies have shown that in the field of pet food processing technology, the processing technology of pet food will also affect the digestion and absorption of nutrients in pet food, thereby affecting intestinal health. Therefore, improving pet food formulas and adjusting processing technology to obtain pet food that meets market demand is one of the hot topics for technicians in this field. Summary of the invention

[0005] The invention provides a pet food with improved excrement odor and a preparation method thereof, which solves the problem that the existing pet food is rich in protein and amino acids and easily produces foul odor in excrement during intestinal digestion.

[0006] The present invention adopts the following technical scheme: a pet food for improving the odor of excrement, comprising a pet base food and a mixed material layer wrapped on the surface of the pet base food, wherein the pet base food comprises 80-90 parts by weight and the mixed material layer comprises 10-20 parts by weight, and the components in the mixed material layer comprise 60-70 parts by weight of livestock and poultry visceral protein fermentation powder, 10-15 parts by weight of kudzu root extract, 5-8 parts by weight of animal fat and 5-10 parts by weight of oligofructose, and at least one isolation layer is further provided between the pet base food and the mixed material layer, and the isolation layer accounts for 2-5% of the total weight of the pet food.

[0007] Furthermore, the isolation layer is sodium carboxymethyl cellulose and total saponin extract of white peony root, and the mass ratio of sodium carboxymethyl cellulose to total saponin extract of white peony root is 1:15-20.

[0008] Furthermore, the method for preparing livestock and poultry protein fermentation powder in the mixing layer comprises the following steps:

[0009] (1) Treating the viscera of livestock and poultry with ozone sterilization by jetting;

[0010] (2) the sterilized livestock and poultry viscera are homogenized at high speed, defatted with isopropyl alcohol, and neutral protease, alkaline protease and papain are added under the assistance of ultrasound to extract livestock and poultry viscera protein to obtain livestock and poultry viscera protein hydrolyzate;

[0011] (3) adding 2-5% by weight of a carbon source to the hydrolyzate of livestock and poultry visceral protein, inoculating a mixed strain of Lactobacillus plantarum, Pediococcus pentosaceus and Kombucha at an inoculum rate of 3-7% by weight, and fermenting at 30-37° C. for 24-72 hours;

[0012] (4) freeze-drying the fermented livestock and poultry visceral protein hydrolysate to obtain livestock and poultry protein powder.

[0013] Furthermore, the mass ratio of the neutral protease, the alkaline protease and the papain is 2:1:1.

[0014] Furthermore, the mass ratio of the mixed strains of Lactobacillus plantarum, Pediococcus pentosaceus and Kombucha is 1:1:1.

[0015] Furthermore, the carbon source is glucose or sucrose.

[0016] A method for preparing pet food for improving excrement odor comprises the following steps:

[0017] (1) Place pet food base materials in a bottom spray fluidizer and heat and dry them at 30-50° C. for 10-15 minutes;

[0018] (2) Isolation layer: Sodium carboxymethyl cellulose and total saponin extract of white peony root are prepared in a mass ratio of 1:15-20, and an appropriate amount of water is added to fully dissolve them and then applied to the surface of the pet base food. After freeze-drying, the isolation layer forms a macroporous isolation layer;

[0019] (3) Mixed material layer: 60-70 parts of livestock and poultry visceral protein fermentation powder, 10-15 parts of kudzu root extract, 5-8 parts of animal fat and 5-10 parts of oligofructose are taken by weight, and the mixture is dissolved and atomized, and sprayed onto the surface of the isolation layer to form a mixed material layer;

[0020] (4) Spray coating material on the surface of the mixed layer.

[0021] Pueraria extract: The main component of Pueraria extract is isoflavones, and flavonoid compounds account for 12%, mainly puerarin, daidzein and daidzein, genistein, etc. Pueraria extract has a good antioxidant effect, and at the same time plays a role in strengthening the spleen and moistening the intestines, promoting the absorption of the spleen and stomach, and can be used in pet food to promote digestion and absorption. At the same time, combined with other components, it can promote the digestion and absorption of protein and reduce the generation of odor in excrement.

[0022] Oligofructose: Oligofructose is a natural dietary fiber that can promote gastrointestinal motility, improve the intestinal ecological environment, and promote intestinal health. At the same time, oligofructose will be broken down into short-chain fatty acids by intestinal flora, which is beneficial to improve the intestinal microecological environment and reduce the generation of odor in excrement.

[0023] White peony total saponin extract: It is a type of saponin. Saponin has excellent biological activity in antibacterial, anti-inflammatory and bidirectional immune regulation. It can be used in animal husbandry as a green and natural growth-promoting additive. Experimental verification shows that white peony total saponin extract has the effect of removing ammonia and sulfur, can increase the absorption of nutrients in the gastrointestinal tract, reduce the excretion of ammonia nitrogen in feces, and greatly reduce ammonia odor.

[0024] The present invention has the following beneficial effects:

[0025] (1) The present invention adopts basic cat food, dog food and other pet foods as pet base food materials, and adopts fermented animal-derived raw materials as the outer mixing layer to prepare pet food. The pet food is healthy and has no other flavor components added, and no preservative ingredients. The mixing layer can also produce more volatile flavor substances, with rich aroma and good palatability. The animal raw materials in the mixing layer are decomposed into small molecule peptides and short-chain fatty acids under the action of various microorganisms, proteases and lipases, which can not only be absorbed by the intestines, but also reduce the allergy rate of large molecule proteins, improve the absorption and utilization rate of mineral elements in pet food, and reduce the odor in pet excrement.

[0026] (2) The mixed material layer of the pet food of the present invention is prepared by fermentation of Lactobacillus plantarum, Pediococcus pentosaceus and Kombucha, which can enhance the distribution of microbial populations in the pet's digestive tract and effectively regulate the pet's intestinal tract.

[0027] (3) The pet food prepared by the present invention uses sodium carboxymethyl cellulose and total saponin extract of white peony to form an isolation layer with a hollow crispy structure in the middle layer, which not only increases the taste when chewing and improves the appetite of pets, but also can block the emission of the aroma of pet base food and the volatilization of nutrients. The total saponin extract of white peony has the effect of deodorizing and reducing ammonia, improving the intestinal health of pets, and has a bubble effect, which reduces the ammonia content in pet feces and reduces the odor of excrement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the pet food of the present invention.

[0029] Figure 2 This is an air composition analysis diagram of a pet cat's room in an embodiment of the present invention.

[0030] Figure 3 This is a characteristic gas composition analysis diagram of pet cat urine in an embodiment of the present invention: wherein 1 is methyl 4-O-benzyl-α-L-rhamnopyranoside; 2 is N-methyl-N-[4-(3-hydroxypyrrolidinyl)-2-butynyl]acetamide; 3 is N-methyl-N-[4-[2-acetoxymethyl-1-pyrrolidinyl]-2-butynyl]acetamide; 4 is indolizine; 5 is 2-15,16-diepoxyhexadecane.

[0031] Figure 4 This is an analysis diagram of the characteristic gas composition in pet cat feces in an embodiment of the present invention: 1 is naphthalene; 2 is 3-methylphenol; 3 is butyl 3-methylbutyrate.

[0032] Figure numerals: pet base food 1, mixed material layer 2, isolation layer 3. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment 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 should fall within the scope of protection of the present invention.

[0034] The total saponin extract of white peony root in the present invention was purchased from Xi'an Zhanxun Biotechnology Co., Ltd.

[0035] The kudzu root extract in the present invention was purchased from Shaanxi New Horizon Biotechnology Co., Ltd.

[0036] Embodiment 1:

[0037] (1) Selection and cultivation of Lactobacillus plantarum, Pediococcus pentosaceus and Kombucha:

[0038] The three strains of Lactobacillus plantarum, Pediococcus pentosaceus and Kombucha were all screened from homemade sour meat and sour fish in the laboratory. The specific steps are as follows:

[0039] (1) Add appropriate amounts of sour meat and sour fish to sterile centrifuge tubes containing a certain amount of physiological saline, mix thoroughly with a beating homogenizer, take the diluted solution and add it to a sterile centrifuge tube containing an appropriate amount of physiological saline, repeat this step to obtain liquids with different dilution gradients;

[0040] (2) Take 50-150 μL of the above dilutions, spread them on MRS solid culture medium, and culture them in a 30°C incubator for 2-3 days;

[0041] (3) Single colonies were picked out, numbered, and inoculated into MRS liquid culture medium using an inoculation loop. After culturing at 37°C for 24 h, the colonies were stored in glycerol.

[0042] (2) Fermentation of livestock and poultry visceral proteins:

[0043] Visceral proteins of livestock and poultry include liver protein, bile protein, biliary protein and intestinal protein, etc. The specific steps of fermentation are as follows:

[0044] (1) First, the viscera of livestock and poultry are sterilized by jet ozone. The working voltage of the ozone generator is 10-15KV, and the air intake of the jet is 2.0-4.5m 3 / H, radiation area is 2.5-5.5m 2 , ozone concentration is 0.4-0.8mg / L, sterilization time is 20-40min;

[0045] (2) After sterilizing the livestock and poultry viscera, the sterilized livestock and poultry viscera are homogenized at high speed and then defatted with isopropanol. Ultrasonic-assisted neutral protease, alkaline protease and papain are used to extract livestock and poultry viscera protein. The mass ratio of the three enzymatic hydrolysates is 2:1:1, the ultrasonic power is 50-200 W, the solid-liquid ratio is 5-2:1, the enzyme activity substrate ratio is 2000-5000 U / g, the ultrasonic extraction time is 30-120 min, and the extraction temperature is 30-50° C., thereby obtaining livestock and poultry viscera protein hydrolysate;

[0046] (3) Adding carbon sources of glucose and sucrose to the above-mentioned livestock and poultry visceral protein hydrolysate, wherein the mass of the glucose and sucrose is 5% of the mass of the livestock and poultry visceral protein hydrolysate, inoculating a mixed bacteria of Lactobacillus plantarum, Pediococcus pentosaceus and Kombucha tea at an inoculation rate of 3-7%, and the mass ratio of the three strains of Lactobacillus plantarum, Pediococcus pentosaceus and Kombucha tea is 1:1:1, and fermenting at 30-37° C. for 24-72 hours to obtain a livestock and poultry visceral protein fermentation product.

[0047] Embodiment 2:

[0048] Detection of content of livestock and poultry protein fermentation products:

[0049] Effects on pH, total colony count, and acid-soluble protein content of livestock and poultry visceral protein in ultrasound-assisted fermentation. An appropriate amount of sterilized water was added to the livestock and poultry visceral protein fermentation medium, and the above-screened ultrasonic parameters were used for treatment. Lactobacillus plantarum, Pediococcus pentosaceus, and Kombucha were inoculated for livestock and poultry visceral protein fermentation, and the indicators of livestock and poultry visceral protein samples fermented for 24h-72h were determined.

[0050] The analysis showed that the basic composition of the fermentation product was: crude protein 58.14%, ash 3.62%, and water activity 0.97.

[0051] The pH of livestock and poultry visceral protein hydrolysate is 6.17. After fermentation, the pH of the product is 4.3, and the acidity is enhanced; the total bacterial colony count is 15 billion / g, the acid-soluble protein is significantly increased from 0.28g / L to 0.57g / L, the amino acid nitrogen is significantly increased from 3.01% to 7.93%, and the total amount of free amino acids is significantly increased from 4.31mg / mL to 9.788mg / mL.

[0052] Embodiment 3:

[0053] Preparation of pet food:

[0054] like Figure 1 As shown, the pet food includes a pet base food and a mixed material layer wrapped on the surface of the pet base food, and at least one isolation layer 3 is included between the pet base food 1 and the mixed material layer 2. The pet base food is cat food, and the pet base food is 65 parts by weight, and the mixed material layer is 35 parts. The components in the mixed material layer 2 are 60 parts by weight of livestock and poultry visceral protein fermentation powder, 12 parts of kudzu root extract, 6 parts of animal fat and 8 parts of oligofructose. The isolation layer is 3% of the total weight of the pet food, and the isolation layer 3 is made of sodium carboxymethyl cellulose and white peony total saponin extract mixed at a mass ratio of 1:18.

[0055] The preparation method comprises the following steps:

[0056] (1) placing pet food base materials in a bottom spray fluidizer for granulation, and heating and drying at 35° C. for 15 min;

[0057] (2) Isolation layer: Sodium carboxymethyl cellulose and total saponin extract of white peony root are prepared in a mass ratio of 1:18, and an appropriate amount of water is added to fully dissolve them and then applied to the surface of the pet base food. After freeze-drying, the isolation layer forms a hollow macroporous isolation layer;

[0058] (3) Mixed material layer: 60 parts of livestock and poultry visceral protein fermentation powder, 12 parts of kudzu root extract, 6 parts of animal fat and 8 parts of oligofructose are taken by weight, and the mixture is dissolved and atomized, and then sprayed onto the surface of the isolation layer to form a mixed material layer;

[0059] (4) Spray coating material on the surface of the mixed layer.

[0060] Compared with pet food, the pet food has a crispy texture and better palatability. Compared with the pet food, after 15 days of exposure, the pet food of the present invention can still maintain the aroma of the pet food and is not affected by moisture, thereby increasing the appetite of the pet.

[0061] Example 4

[0062] The isolation layer is one layer, and the preparation method is the same as that of Example 3. The specific component contents are (by weight): 60 parts of pet base food and 40 parts of mixed material layer. The isolation layer accounts for 5% of the total weight of the pet food.

[0063] The contents of the components in the mixed layer are (by weight): 65 parts of livestock and poultry visceral protein fermentation powder, 10 parts of kudzu root extract, 5 parts of animal fat and 10 parts of oligofructose.

[0064] The isolation layer is prepared by mixing sodium carboxymethyl cellulose and total saponin extract of white peony root in a mass ratio of 1:15.

[0065] Example 5

[0066] The isolation layer is one layer, and the preparation method is the same as that of Example 3. The specific component contents are (by weight): 70 parts of pet base food and 30 parts of mixed material layer. The isolation layer accounts for 2% of the total weight of the pet food.

[0067] The contents of the components in the mixed layer are (by weight): 70 parts of livestock and poultry visceral protein fermentation powder, 15 parts of kudzu root extract, 8 parts of animal fat and 5 parts of oligofructose.

[0068] The isolation layer is prepared by mixing sodium carboxymethyl cellulose and total saponin extract of white peony root in a mass ratio of 1:20.

[0069] Example 6

[0070] The components and steps are the same as those in Example 3. The isolation layer includes two layers. The isolation layer in step (2) is repeated twice and freeze-dried on both sides to obtain the product.

[0071] According to tests, the addition of an isolation layer can increase the crispiness of pet food, making it more acceptable to pets.

[0072] Example 7

[0073] The pet food prepared in Example 3 and the cat food with the same pet base material in the pet food were fed to pet cats for 30 days, and then the food intake and weight change index of the pet cats were weighed and recorded, and the pet cat litter and feces were taken to analyze the volatile substance composition.

[0074] Feeding started at 08:00 every day and 250 mL of room temperature water was given. All animals were fed a basic diet, and each group of animals received different feeding treatments according to the grouping during the formal period of 30 days. Necessary immunization and deworming treatments were carried out before the experiment. Every day, the agglomerated cat litter and feces were removed, the cat house was cleaned, and the cat house was kept clean, but the cat house was not ventilated. During the trial period, the initial weight and weight after the experiment of all cats, eating conditions, mental state, and whether there were adverse reactions such as diarrhea and vomiting were observed and recorded. If there were adverse reactions for a long time, the experiment was terminated. Finally, after the two-week formal experiment, the gas, cat litter and feces in the control group and experimental group rooms were collected.

[0075] Index measurement: Growth performance, breeding room gas and pet feces were measured and analyzed respectively.

[0076] (1) Growth performance measurement

[0077] One day before the formal experiment and one day after the experiment, the experimental animals in each group were weighed on an empty stomach and the average daily weight gain was calculated.

[0078] Average daily weight gain = (final total weight - initial total weight) / (number of test days × number of test animals). The results are shown in Table 1.

[0079] Table 1 Types of experimental cats and weight changes

[0080]

[0081] From the results in Table 1, it can be seen that after being fed with the experimental group pet food for 30 days, the weight of the pet cats in the experimental group increased significantly, and the average daily weight gain was much higher than that of the group fed with the ordinary group cat food, which shows that the pet food prepared by the present invention is more palatable.

[0082] Table 2 Growth performance results

[0083]

[0084]

[0085] From the results in Table 2, we can see that the feed intake of the blank group is 72.3g / day / head; that of the experimental group is 81.7g / day / head.

[0086] According to the results of the pet cat feeding rate experiment, the feeding amount of the experimental group increased significantly by 45%. That is, the taste and smell of the pet food prepared by the preparation method of the present invention can enhance the feeding appetite of pet cats, thereby significantly increasing the half-day feeding amount of pet cats within 30 days, while in the blank group, there was no obvious increase in feeding amount.

[0087] (2) Gas collection and analysis in the breeding room

[0088] For the experimental group and the blank group, air bags were used to collect the gas in the animal cages, and the gas was analyzed using an electronic nose (EN).

[0089] like Figure 2 Results of air composition analysis in the electronic tongue of the room where the pet cats are kept: R1: aromatic compounds, R2: nitrogen oxides, R3: nitrogen aromatic molecules, R4: hydrides, R5: olefins, polar molecules, R6: alkanes, R7: sulfur compounds, R8: alcohols, some aromatic compounds, R9: organic compounds of sulfur, R10: alkanes and aliphatic

[0090] Depend on Figure 2 It can be seen that compared with the blank group, the sulfides and sulfur organic compounds in the air of the experimental group's room were significantly reduced. These substances are relatively pungent and have a very characteristic rotten egg smell, such as hydrogen sulfide, mercaptans and other stinky substances.

[0091] (3) Pet feces testing

[0092] The volatile gases in cat litter and feces were determined by headspace solid phase microextraction gas chromatography-mass spectrometry (HS-SPME-GC-MS) combined with comprehensive two-dimensional gas chromatography-time of flight mass spectrometry (GC×GC-TOF-MS).

[0093] Depend on Figure 3 It can be seen that the cat litter in the blank group mainly has the following pungent odors: methyl 4-O-benzyl-α-L-rhamnopyranoside, N-methyl-N-[4-(3-hydroxypyrrolidinyl)-2-butynyl]acetamide, N-methyl-N-[4-[2-acetoxymethyl-1-pyrrolidinyl]-2-butynyl]acetamide, indolizine and 1,2-15,16-diepoxyhexadecane.

[0094] In the cat litter of the experimental group, three of the above five irritating odor gases were not detected. In addition, the proportions of methyl 4-O-benzyl-α-L-rhamnopyranoside and N-methyl-N-[4-(3-hydroxypyrrolidinyl)-2-butynyl]acetamide were also significantly reduced. Therefore, it can be seen that after eating the pet food of the experimental group, the proportion of irritating gases in the cat litter was significantly improved.

[0095] Depend on Figure 4It can be seen that the analysis of the typical characteristic gas composition in cat feces found that the indole content in the blank group was 46.43%, and the indole in the experimental group slightly decreased to 45.1%, but there was no significant difference. However, in the blank group, the naphthalene content was relatively high, at 1.0287%, while the naphthalene component accounted for only 0.1086% in the experimental group. The proportion of 3-methylphenol in the feces of the blank group was 0.7415%, while the proportion of 3-methylphenol in the experimental group was only 0.0141%. In addition, the feces of the blank group contained 3-methylbutyrate, accounting for 0.1847%, but this component was not detected in the experimental group. This shows that after eating the pet food of the experimental group of the present invention, the odor components in the excrement of pet cats can be significantly improved.

Claims

1. A pet food for improving excrement odor, characterized in that: The pet food comprises a base food and a mixed material layer wrapped on the surface of the base food, wherein the base food comprises 80-90 parts by weight and the mixed material layer comprises 10-20 parts by weight, and the components in the mixed material layer comprise 60-70 parts by weight of livestock and poultry visceral protein fermentation powder, 10-15 parts by weight of kudzu root extract, 5-8 parts by weight of animal fat and 5-10 parts by weight of oligofructose, and at least one isolation layer is provided between the base food and the mixed material layer, and the isolation layer accounts for 2-5% of the total weight of the pet food.

2. The pet food for improving excrement odor according to claim 1, characterized in that: The isolation layer is sodium carboxymethyl cellulose and total saponin extract of white peony root, and the mass ratio of sodium carboxymethyl cellulose to total saponin extract of white peony root is 1:15-20.

3. The pet food for improving excrement odor according to claim 1, characterized in that: The method for preparing livestock and poultry protein fermentation powder in the mixing layer comprises the following steps: (1) Treat livestock and poultry viscera with ozone sterilization by jetting; (2) The sterilized livestock and poultry viscera are homogenized at high speed and then defatted with isopropyl alcohol. Neutral protease, alkaline protease and papain are added under the assistance of ultrasound to extract livestock and poultry viscera protein to obtain livestock and poultry viscera protein hydrolyzate; (3) Add 2-5% by weight of carbon source to the hydrolyzate of livestock and poultry visceral protein, inoculate a mixed strain of Lactobacillus plantarum, Pediococcus pentosaceus and Kombucha at an inoculation rate of 3-7% by weight, and ferment at 30-37°C for 24-72 hours; (4) freeze-drying the fermented livestock and poultry visceral protein hydrolysate to obtain livestock and poultry protein powder.

4. The pet food for improving excrement odor according to claim 3, characterized in that: The mass ratio of the neutral protease, the alkaline protease and the papain is 2:1:

1.

5. The pet food for improving excrement odor according to claim 3, characterized in that: The mass ratio of the mixed strains of Lactobacillus plantarum, Pediococcus pentosaceus and Kombucha is 1:1:

1.

6. The pet food for improving excrement odor according to claim 3, characterized in that: The carbon source is glucose or sucrose.

7. A method for preparing pet food for improving excrement odor, characterized in that: The steps include: (1) Place the pet food base material in a bottom spray fluidized bed equipment and heat and dry it at 30-50°C for 10-15 minutes; (2) Isolation layer: Sodium carboxymethyl cellulose and total saponin extract of white peony root are prepared in a mass ratio of 1:15-20, and an appropriate amount of water is added to fully dissolve them and then applied to the surface of the pet base food. After freeze-drying, the isolation layer forms a macroporous isolation layer; (3) Mixed material layer: Take 60-70 parts of livestock and poultry visceral protein fermentation powder, 10-15 parts of Pueraria extract, 5-8 parts of animal fat and 5-10 parts of oligofructose by weight, dissolve the mixture, atomize it, and spray it onto the surface of the isolation layer to form a mixed material layer; (4) Spraying a coating material on the surface of the mixed material layer, and drying the mixed material layer to obtain pet food.

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