Plant extract composition pet food for improving dog tear stains and preparation method of plant extract composition pet food

Abstract

The present invention belongs to the technical field of pet food and particularly relates to a dog tear stain improving plant extract composition pet food and a preparation method thereof, and the dog tear stain improving plant extract composition pet food comprises the following components in parts by weight: 50-60 parts of duck meat, 10-20 parts of soybean enzymolysis protein, 5-10 parts of cassava starch, 3-5 parts of fish oil, 2-4 parts of snow pears, 0.4-0.8 part of vitamin C, 0.4-0.8 part of vitamin E and 1-2 parts of cellulose. The composition comprises the following components in parts by weight: 0.1-0.3 part of chicory root powder, 0.1-0.3 part of yucca extract, 0.4-1.2 parts of plant extract composition and 0.1-0.3 part of nanocrystalline curcumin. According to the air-dried pet food added with the specially-treated combination of the hypoallergenic meat source and the plant extract, the nutritional ingredients are locked to the maximum extent, the nutrient digestion and absorption rate is increased, and the tear stain phenomenon caused by dietary habits can be improved and eliminated only through daily feeding.

Description

Technical Field

[0001] This invention belongs to the technical field of pet food, specifically relating to a plant extract composition pet food for improving tear stains in dogs and its preparation method. Background Technology

[0002] With the rise of my country's pet economy, more and more dog lovers are using pets to express their emotional needs, and the status of dogs in the family has risen sharply. Pet owners are also paying more and more attention to the health and nutrition of their pet dogs, among which tear stains are one of the concerns of pet owners.

[0003] Tear stains in dogs are dark marks formed when secretions from the dog's eyes (porphyrins, iron compounds) come into contact with the fur. This not only affects the pet's appearance but also causes the surrounding skin to become damp, leading to the growth of bacteria and fungi, inflammation, and ultimately affecting the pet's health.

[0004] The causes of tear stains in dogs are very complex. The formation of tear stains can be divided into physiological factors, pathological factors and dietary factors.

[0005] Currently, pathological and physiological tear stains are mainly treated with medication or clinical surgery. Clinical treatment not only requires a specific environment and is costly, but also carries certain risks.

[0006] Most tear stain improvement products on the market are topical medications containing chemical ingredients, which may irritate a dog's skin and eyes, and lack ingredients that protect the liver and gallbladder.

[0007] Prolonged improper diet in dogs, such as feeding them stale food, insufficient vitamins and minerals, or food containing highly allergenic ingredients, can increase tear production. Existing tear stain removal products are mostly extruded products. Traditional fresh meat extruded dry food contains multiple meat sources, increasing the risk of allergies. The added meat sources are often unprocessed meat or even lower-quality meat meal, and the high-temperature extrusion process easily denatures proteins, causing the loss of nutrients such as meat protein, vitamins, and minerals, thus reducing nutritional value. Summary of the Invention

[0008] To address the shortcomings of the existing technology, this invention provides a plant extract composition pet food for improving tear stains in dogs and its preparation method. The air-dried pet food, which combines specially treated hypoallergenic meat and plant extracts, locks in nutrients to the maximum extent and improves nutrient digestibility and absorption. Tear stains caused by dietary habits can be improved and removed simply by feeding the food daily.

[0009] The specific technical solution is as follows: The first objective of this invention is to provide a plant extract composition pet food for improving tear stains in dogs, comprising the following components by weight: 50-60 parts duck meat, 10-20 parts soy hydrolyzed protein, 5-10 parts tapioca starch, 3-5 parts fish oil, 2-4 parts pear, 0.4-0.8 parts vitamin C, 0.4-0.8 parts vitamin E, 1-2 parts cellulose, 0.1-0.3 parts chicory root powder, 0.1-0.3 parts yucca extract, 0.4-1.2 parts plant extract composition, and 0.1-0.3 parts nanocrystalline curcumin.

[0010] The beneficial effects of the above approach are as follows: Red meat (beef, lamb, and venison) is rich in iron, which increases the burden on the dog's liver after ingestion, requiring the processing of additional iron and magnesium. The higher saturated fat content also exacerbates the liver's burden, leading to porphyrin accumulation and worsening tear stains. This invention selects the milder, less allergenic duck meat as the main protein source to reduce tear stains. Duck meat is rich in B vitamins and vitamin E, more than other meats, and has anti-inflammatory and heat-clearing effects. It contains unsaturated fatty acids and low-carbon saturated fatty acids, making it easily digestible and reducing the metabolic burden on the liver. Furthermore, emulsified duck meat has a more even distribution of protein and fat, a finer texture, and improved palatability.

[0011] By utilizing the emulsifying effect of enzymatically hydrolyzed soybean protein, meat raw materials can be processed. At the same time, the hydrolyzed soybean protein contains easily digestible and absorbable small peptides, reducing the digestive burden on pets.

[0012] Vitamin C plays various physiological roles in dogs, such as promoting immune system function, participating in antioxidant reactions, and promoting collagen synthesis. In the treatment of tear stains in dogs, vitamin C may alleviate symptoms through its antioxidant and anti-inflammatory effects. Furthermore, vitamin C can promote collagen synthesis, helping to maintain the health of the skin around the eyes. Vitamin E is a bioactive antioxidant that neutralizes free radicals. It can reduce inflammation and edema in the periorbital area while protecting eye tissues from free radical damage. In products that supplement with high levels of unsaturated fatty acids, additional vitamin E supplementation is necessary to mitigate oxidation in the body; vitamin E deficiency in dogs can lead to retinal degeneration.

[0013] Curcumin is a natural polyphenol extracted from the turmeric plant (Zingiber officinale). It possesses various nutritional activities and pharmacological functions, such as antioxidant, anti-inflammatory, anti-cancer, anti-tumor, anti-diabetic, antiviral, lipid-lowering, and immune-enhancing effects. However, conventional curcumin is poorly absorbed in the gastrointestinal tract, with only a very small amount being absorbed and utilized. If not fully absorbed, curcumin is rapidly eliminated, significantly reducing its effectiveness. Nanocrystalline curcumin, based on supramolecular chemistry principles, enhances the interaction between curcumin and its carrier, allowing it to remain stable in a glassy state for extended periods. This reduces the lattice work required during dissolution, thereby improving bioavailability. This invention uses nanocrystalline curcumin, which increases the contact area with gastrointestinal fluids and significantly improves the digestion and absorption of curcumin in the body. It is also combined with soybean small molecule peptides, which are more easily digested and absorbed after enzymatic hydrolysis, to improve the digestion and absorption of the material in the pet's body, prolong its time in the body, improve bioavailability, maximize the ability of curcumin to regulate fat metabolism, activate the antioxidant system, and enhance the protective effect on the pet's liver.

[0014] Furthermore, the plant extract composition comprises the following components by weight: 0.1-0.3 parts blueberry extract, 0.1-0.3 parts wolfberry extract, 0.1-0.3 parts cassia seed extract, and 0.1-0.3 parts natural lutein.

[0015] The beneficial effects of the above-mentioned approach are as follows: Combining the plant extracts (goji berry extract, cassia seed extract, bilberry extract, and natural lutein) enhances antioxidant capacity and inhibits inflammation. Natural lutein, derived from marigolds, is a natural antioxidant. Combined with bilberry extract, which contains vitamin C and vitamin E, it creates a synergistic effect of dual natural antioxidants, combating free radicals, inhibiting and scavenging their activity, reducing oxidative stress in eye tissues, and thus playing an antioxidant role. This, in turn, promotes the formation of rhodopsin in the retina and increases the density of the macular pigment, inhibiting oxidative damage to eye tissues. After scavenging free radicals in the body, the synergistic effect of goji berry extract (whose main active substances are goji berry polysaccharides) and cassia seed extract (containing free anthraquinones) inhibits inflammatory responses, reduces pro-inflammatory factors, and achieves a clearing and anti-inflammatory effect in the body, thereby improving eyesight.

[0016] Furthermore, the duck meat is fresh duck meat, the pear is fresh pear, and the tapioca starch is pregelatinized tapioca starch.

[0017] The beneficial effects of adopting the above approach are: combined with fresh pears, it achieves the effects of clearing heat, improving eyesight, and reducing internal heat. At the same time, the yucca extract and soluble dietary fiber from fresh fruits and vegetables promote digestion while inhibiting the fermentation of harmful substances.

[0018] Adding pre-gelatinized tapioca starch gives it better flowability, adhesion, and stability than regular tapioca starch. It can expand and spread rapidly in water, and has higher viscosity and transparency. In contrast, regular tapioca starch requires heating to gelatinize and has lower viscosity.

[0019] A second objective of this invention is to provide a method for preparing pet food containing the above-mentioned plant extract composition for improving tear stains in dogs, comprising the following steps: S1. Weigh out the duck meat and snow pear according to the weight proportions, and coarsely mince the duck meat and snow pear separately; S2. Place the coarsely minced duck meat and the weighed soybean enzymatic protein into an emulsifier for emulsification. S3. Weigh other raw and auxiliary materials according to the weight proportions, put them into a mixer with the emulsified product of S2, and mix evenly to obtain mixed raw materials; S4. The mixed raw material obtained in S3 is conveyed to the molding equipment and extruded into round granules; S5. Spread the extruded granules evenly on a wire mesh and air dry; S6. The dried granules are transported to the metal detector via a cooling line. S7. Remove excess powder from qualified products by passing them through a vibrating screen; S8. Pack the final qualified products into packaging bags and seal them.

[0020] Furthermore, in step S1, the duck meat and pear are coarsely minced by passing them through mesh plates with apertures of 16mm and 12mm, respectively.

[0021] Furthermore, in step S2, the mesh size of the emulsifier is 4mm / 2.5mm / 1.5mm, and the emulsification time is 5-30min.

[0022] Furthermore, in step S4, the vacuum degree of the molding equipment is set to 100%.

[0023] Furthermore, in step S4, the material is extruded into spherical particles with a diameter of 8 mm.

[0024] Furthermore, in step S5, the air-drying temperature is set to 70-80℃ and the air-drying time is 8-10 hours.

[0025] Furthermore, in step S5, the moisture content is air-dried to below 14%.

[0026] Furthermore, in step S6, the natural cooling time for the cooling line is 3-5 minutes.

[0027] Furthermore, in step S6, the metal detector performs sensitivity testing every hour using 1.5mm iron, 1.5mm non-ferrous and 1.5mm stainless steel test blocks.

[0028] The beneficial effects of adopting the above solution are: the present invention aims to improve the utilization rate of the plant extract composition by adding specific plant extract composition and pre-treating the raw materials in pet food according to scientific ratio and low-temperature air drying. Tear stains caused by dietary habits can be improved and removed simply by daily feeding.

[0029] Addressing the issues of diverse and inconsistent meat sources, high allergy rates, and the presence of irritating chemicals in existing pet tear stain treatment extruded dog food, this invention utilizes a low-temperature air-drying process to protect the food's enzymes, nutrients, and proteins, significantly locking in the nutritional components and improving nutrient absorption. Furthermore, the addition of emulsified, hypoallergenic, and gentle duck meat further reduces the risk of allergies. Simultaneously, through the synergistic effects of goji berry extract, cassia seed extract, bilberry extract, and natural lutein; the synergistic effects of pear and yucca extracts; and the synergistic effects of enzymatically hydrolyzed soybean protein and nanocrystalline curcumin, this invention not only improves tear stains but also protects the liver and gallbladder health of dogs. Detailed Implementation

[0030] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention. The parts mentioned in the specific embodiments are parts by weight.

[0031] In the specific implementation, the soybean enzymatic hydrolysate was purchased from Shandong Yuxin Biotechnology Co., Ltd., the pregelatinized cassava starch was purchased from Hangzhou Prostar Starch Co., Ltd., the yucca extract was purchased from Weifang Xinmeite Agricultural and Animal Husbandry Technology Co., Ltd., the blueberry extract, wolfberry extract, and cassia seed extract were purchased from Xi'an Lesen Biotechnology Co., Ltd., and the nanocrystalline curcumin was purchased from Hangzhou Aibed Life Science and Technology Research Institute.

[0032] Example 1 A plant extract composition for improving tear stains in dogs, comprising the following components by weight: 50 parts fresh duck meat, 10 parts hydrolyzed soybean protein, 5 parts pregelatinized tapioca starch, 3 parts fish oil, 2 parts fresh pear, 0.4 parts vitamin C, 0.4 parts vitamin E, 1 part cellulose, 0.1 parts chicory root powder, 0.1 parts yucca extract, 0.1 parts blueberry extract, 0.1 parts wolfberry extract, 0.1 parts cassia seed extract, 0.1 parts natural lutein, and 0.1 parts nanocrystalline curcumin.

[0033] A method for preparing a pet food containing a plant extract composition that improves tear stains in dogs, comprising the following steps: S1. Weigh out fresh duck meat and fresh pears according to the weight proportions, and coarsely grind the fresh duck meat and fresh pears through mesh plates with apertures of 16mm and 12mm respectively. S2. Place the coarsely minced duck meat and the weighed soybean enzymatic protein into an emulsifier for emulsification. The mesh size of the emulsifier is 4mm / 2.5mm / 1.5mm, and the emulsification time is 5 minutes. S3. Weigh other raw and auxiliary materials according to the weight proportions, put them into a mixer with the emulsified product of S2, and mix evenly to obtain mixed raw materials; S4. The mixed raw material obtained in S3 is conveyed to the molding equipment. The vacuum degree of the molding equipment is set to 100%, and the material is extruded into round particles with a diameter of 8mm. S5. Spread the extruded granules evenly on a wire mesh and air dry them. Set the air drying temperature to 70℃ and the air drying time to 10 hours, until the moisture content is below 14%. S6. The air-dried granules are transported to the metal detector via a cooling line. The cooling line is allowed to cool naturally for 3 minutes. The metal detector is tested for sensitivity every hour using 1.5mm iron, 1.5mm non-ferrous and 1.5mm stainless steel test blocks. S7. Remove excess powder from qualified products by passing them through a vibrating screen; S8. Pack the final qualified products into packaging bags and seal them.

[0034] Example 2 A plant extract composition for pet food that improves tear stains in dogs, comprising the following components by weight: 55 parts fresh duck meat, 15 parts hydrolyzed soybean protein, 7 parts pregelatinized tapioca starch, 4 parts fish oil, 3 parts fresh pear, 0.6 parts vitamin C, 0.6 parts vitamin E, 1.5 parts cellulose, 0.2 parts chicory root powder, 0.2 parts yucca extract, 0.2 parts blueberry extract, 0.2 parts wolfberry extract, 0.2 parts cassia seed extract, 0.2 parts natural lutein, and 0.2 parts nanocrystalline curcumin.

[0035] A method for preparing a pet food containing a plant extract composition that improves tear stains in dogs, comprising the following steps: S1. Weigh out fresh duck meat and fresh pears according to the weight proportions, and coarsely grind the fresh duck meat and fresh pears through mesh plates with apertures of 16mm and 12mm respectively. S2. Place the coarsely minced duck meat and the weighed soybean enzymatic protein into an emulsifier for emulsification. The mesh size of the emulsifier is 4mm / 2.5mm / 1.5mm, and the emulsification time is 18min. S3. Weigh other raw and auxiliary materials according to the weight proportions, put them into a mixer with the emulsified product of S2, and mix evenly to obtain mixed raw materials; S4. The mixed raw material obtained in S3 is conveyed to the molding equipment. The vacuum degree of the molding equipment is set to 100%, and the material is extruded into round particles with a diameter of 8mm. S5. Spread the extruded granules evenly on a wire mesh and air dry them. Set the air drying temperature to 75℃ and the air drying time to 9 hours, until the moisture content is below 14%. S6. The air-dried granules are transported to the metal detector via a cooling line. The cooling line is allowed to cool naturally for 4 minutes. The metal detector is tested for sensitivity every hour using 1.5mm iron, 1.5mm non-ferrous and 1.5mm stainless steel test blocks. S7. Remove excess powder from qualified products by passing them through a vibrating screen; S8. Pack the final qualified products into packaging bags and seal them.

[0036] Example 3 A plant extract composition for pet food that improves tear stains in dogs, comprising the following components by weight: 60 parts fresh duck meat, 20 parts hydrolyzed soybean protein, 10 parts pregelatinized tapioca starch, 5 parts fish oil, 4 parts fresh pear, 0.8 parts vitamin C, 0.8 parts vitamin E, 2 parts cellulose, 0.3 parts chicory root powder, 0.3 parts yucca extract, 0.3 parts blueberry extract, 0.3 parts wolfberry extract, 0.3 parts cassia seed extract, 0.3 parts natural lutein, and 0.3 parts nanocrystalline curcumin.

[0037] A method for preparing a pet food containing a plant extract composition that improves tear stains in dogs, comprising the following steps: S1. Weigh out fresh duck meat and fresh pears according to the weight proportions, and coarsely grind the fresh duck meat and fresh pears through mesh plates with apertures of 16mm and 12mm respectively. S2. Place the coarsely minced duck meat and the weighed soybean enzymatic protein into an emulsifier for emulsification. The mesh size of the emulsifier is 4mm / 2.5mm / 1.5mm, and the emulsification time is 30 minutes. S3. Weigh other raw and auxiliary materials according to the weight proportions, put them into a mixer with the emulsified product of S2, and mix evenly to obtain mixed raw materials; S4. The mixed raw material obtained in S3 is conveyed to the molding equipment. The vacuum degree of the molding equipment is set to 100%, and the material is extruded into round particles with a diameter of 8mm. S5. Spread the extruded granules evenly on a wire mesh and air dry them. Set the air drying temperature to 80℃ and the air drying time to 8 hours, until the moisture content is below 14%. S6. The air-dried granules are transported to the metal detector via a cooling line. The cooling line is allowed to cool naturally for 5 minutes. The metal detector is tested for sensitivity every hour using 1.5mm iron, 1.5mm non-ferrous and 1.5mm stainless steel test blocks. S7. Remove excess powder from qualified products by passing them through a vibrating screen; S8. Pack the final qualified products into packaging bags and seal them.

[0038] Example 4 A plant extract composition for improving tear stains in dogs, comprising the following components by weight: 50 parts fresh duck meat, 10 parts hydrolyzed soy protein, 5 parts pregelatinized tapioca starch, 3 parts fish oil, 4 parts fresh pear, 0.4 parts vitamin C, 0.4 parts vitamin E, 1 part cellulose, 0.3 parts chicory root powder, 0.3 parts yucca extract, 0.3 parts blueberry extract, 0.3 parts wolfberry extract, 0.3 parts cassia seed extract, 0.3 parts natural lutein, and 0.3 parts nanocrystalline curcumin.

[0039] A method for preparing a pet food containing a plant extract composition that improves tear stains in dogs, as described in Example 1.

[0040] Comparative Example 1 A pet food for improving tear stains in dogs comprises the following ingredients by weight: 50 parts fresh duck meat, 10 parts hydrolyzed soy protein, 5 parts pregelatinized tapioca starch, 3 parts fish oil, 4 parts fresh pear, 0.4 parts vitamin C, 0.4 parts vitamin E, 1 part cellulose, 0.3 parts chicory root powder, 0.3 parts yucca extract, 0.3 parts wolfberry extract, 0.3 parts cassia seed extract, 0.3 parts natural lutein, and 0.3 parts nanocrystalline curcumin.

[0041] A method for preparing pet food that improves tear stains in dogs, referring to Example 4 (or Example 1), differs from Example 4 (or Example 1) in that bilberry extract is not added.

[0042] Comparative Example 2 A pet food for improving tear stains in dogs, referring to Comparative Example 1, except that 0.3 parts of cassia seed extract are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4, except that cassia seed extract is not added.

[0043] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 1, except that 0.3 parts of cassia seed extract are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4 (or Example 1), except that cassia seed extract is not added.

[0044] Comparative Example 3 A pet food for improving tear stains in dogs, referring to Comparative Example 1, except that 0.3 parts of natural lutein are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4, except that natural lutein is not added.

[0045] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 1, except that 0.3 parts of natural lutein are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4 (or Example 1), except that natural lutein is not added.

[0046] Comparative Example 4 A pet food for improving tear stains in dogs, referring to Comparative Example 1, except that 0.3 parts of wolfberry extract are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4, except that wolfberry extract is not added.

[0047] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 1, except that 0.3 parts of wolfberry extract are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4 (or Example 1), except that wolfberry extract is not added.

[0048] Comparative Example 5 A pet food for improving tear stains in dogs, referring to Comparative Example 1, except that 0.3 parts of nanocrystalline curcumin are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4, except that nanocrystalline curcumin is not added.

[0049] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 1, differs from Comparative Example 1 in that 0.3 parts of nanocrystalline curcumin are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4 (or Example 1), the difference from Example 4 (or Example 1) is that nanocrystalline curcumin is not added.

[0050] Comparative Example 6 A pet food for improving tear stains in dogs, referring to Comparative Example 1, except that 10 parts of hydrolyzed soy protein were replaced with 0.3 parts of blueberry extract; that is, referring to Example 4, except that hydrolyzed soy protein was not added.

[0051] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 1, except that 10 parts of enzymatically hydrolyzed soybean protein are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4 (or Example 1), except that enzymatically hydrolyzed soybean protein is not added.

[0052] Comparative Example 7 A pet food for improving tear stains in dogs, referring to Comparative Example 1, except that 0.3 parts of yucca extract are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4, except that yucca extract is not added.

[0053] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 1, except that 0.3 parts of yucca extract are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4 (or Example 1), except that yucca extract is not added.

[0054] Comparative Example 8 A pet food for improving tear stains in dogs, referring to Comparative Example 1, except that 4 parts of fresh pear were replaced with 0.3 parts of blueberry extract; that is, referring to Example 4, except that fresh pear was not added.

[0055] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 1, except that 4 parts of fresh pear are replaced with 0.3 parts of blueberry extract; that is, referring to Example 4, except that fresh pear is not added.

[0056] Comparative Example 9 A pet food for improving tear stains in dogs, compared with Comparative Example 1, except that it contains 0.4 parts of wolfberry extract, 0.4 parts of cassia seed extract, and 0.4 parts of natural lutein.

[0057] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 1 (or Example 1, Example 4), differs in that the weight proportions of the above-mentioned components are changed.

[0058] Comparative Example 10 A pet food for improving tear stains in dogs, compared with Comparative Example 2, except that it contains 0.4 parts of wolfberry extract, 0.4 parts of blueberry extract, and 0.4 parts of natural lutein.

[0059] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 2 (or Example 1, Example 4, Comparative Example 1), differs in that the weight proportions of the above-mentioned components are changed.

[0060] Comparative Example 11 A pet food for improving tear stains in dogs, compared with Comparative Example 3, except that it contains 0.4 parts of wolfberry extract, 0.4 parts of blueberry extract, and 0.4 parts of cassia seed extract.

[0061] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 3 (or Example 1, Example 4, Comparative Example 1), differs in that the weight proportions of the above-mentioned components are changed.

[0062] Comparative Example 12 A pet food for improving tear stains in dogs, compared with Comparative Example 4, but differing from Comparative Example 4 in that it contains 0.4 parts of natural lutein, 0.4 parts of blueberry extract, and 0.4 parts of cassia seed extract.

[0063] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 4 (or Example 1, Example 4, Comparative Example 1), differs in that the weight proportions of the above-mentioned components are changed.

[0064] Comparative Example 13 A pet food to improve tear stains in dogs, compared with Comparative Example 5, except that it contains 10.3 parts of enzymatically hydrolyzed soy protein.

[0065] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 5 (or Example 1, Example 4, Comparative Example 1), differs in that the weight proportions of the above-mentioned components are changed.

[0066] Comparative Example 14 A pet food to improve tear stains in dogs, compared with Comparative Example 7, except that it contains 4.3 servings of fresh pear.

[0067] A method for preparing pet food that improves tear stains in dogs, referring to Comparative Example 7 (or Example 1, Example 4, Comparative Example 1), differs in that the weight proportions of the above-mentioned components are changed.

[0068] The component dosages for each embodiment and comparative example are shown in Table 1.

[0069] Table 1. Component dosage for each embodiment and comparative example (unit: parts)

[0070] Test experiment: 1. Tear stain scoring experiment: Ninety healthy dogs, excluding those with some tear stain issues, were selected and divided into 18 groups. They were fed twice daily, at fixed times and in fixed quantities, the pet food prepared according to Examples 1-4 and Comparative Examples 1-14. After the formal experiment began, the dogs' tear stains were scored every 7 days for 4 weeks: day 0, day 7, day 14, day 21, and day 28. The scores were based on changes in tear stains, and the scoring criteria are shown in Table 2.

[0071] Table 2 Tear Stain Rating

[0072] The tear stain rating data are shown in Table 3 below. The tear stain rating data are expressed as mean ± standard error, and the same subscript letter indicates that the difference is not significant.

[0073] Table 3. Effects of pet food on the average tear stain score of dogs in each example and comparative example.

[0074] Comparing the test data in Table 3, it can be seen that the scores of Examples 1-4 of the present invention are significantly lower than those of Comparative Examples 1-4 and 9-12, indicating that the wolfberry extract, cassia seed extract, blueberry extract, and natural lutein in the plant extract compositions of Examples 1-4 of the present invention have a synergistic effect, which can significantly improve tear stains in pet dogs. The scores of Examples 1-4 of the present invention are significantly lower than those of Comparative Examples 5-6 and 13, indicating that the nanocrystalline curcumin and soybean enzymatic protein in Examples 1-4 of the present invention have a synergistic effect, which can improve the digestion and absorption of materials in the pet's body, reduce the digestive burden of the pet, improve bioavailability, and enhance the protective effect on the pet's liver, thereby improving tear stains in pet dogs. The scores of Examples 1-4 of the present invention are significantly lower than those of Comparative Examples 7-8 and 14, indicating that the fresh pear and yucca extracts in Examples 1-4 of the present invention have a synergistic effect. The soluble dietary fiber in yucca extract and fresh fruits and vegetables promotes digestion and inhibits the fermentation of harmful substances, thereby improving tear stains in pet dogs.

[0075] 2. Digestion and absorption experiment: Fifty healthy dogs were selected and divided into 10 groups, corresponding to the pet foods prepared in Examples 1-4, Comparative Examples 5-8, and Comparative Examples 13-14, respectively. The pet digestibility and absorption experiment was conducted using the 24-hour total fecal-urine collection method. The experimental period was 10 days, with a 6-day pre-feeding period and a 4-day formal experimental period for fecal collection. During the formal experimental period, feces were collected daily, weighed, dried, and the apparent digestibility of dry matter, crude protein, and crude fat in the feces and feed was determined. The data are shown in Table 4. Data are expressed as mean ± standard error, with identical subscripts indicating no significant difference.

[0076] Apparent digestibility of nutrients (%) = {1 - (nutrient content in feces × acid-insoluble ash in feed) / (nutrient content in feed × acid-insoluble ash in feces)} × 100 Table 4. Effects of pet foods from each example and comparative example on the digestibility and absorption of pet dogs.

[0077] Comparing the test data in Table 4, it can be seen that the apparent digestibility of dry matter, crude protein, and crude fat in Examples 1-4 of this invention is significantly higher than that in Comparative Examples 5-6 and 13. This further demonstrates that the nanocrystalline curcumin and soybean enzymatically hydrolyzed protein in Examples 1-4 of this invention have a synergistic effect, which can improve the digestion and absorption of materials in pets, reduce the digestive burden on pets, improve bioavailability, and enhance the protective effect on the pet's liver, thereby improving tear stains in dogs. The apparent digestibility of dry matter, crude protein, and crude fat in Examples 1-4 of this invention is significantly higher than that in Comparative Examples 7-8 and 14. This further demonstrates that the fresh pear and yucca extracts in Examples 1-4 of this invention have a synergistic effect. The soluble dietary fiber in yucca extract and fresh fruits and vegetables promotes digestion while inhibiting the fermentation of harmful substances, thereby improving tear stains in dogs.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pet food of a plant extract composition for improving tear stains in dogs, characterized by, The duck meat 50-60 parts by weight, soybean enzymatic protein 10-20 parts, cassava starch 5-10 parts, fish oil 3-5 parts, snow pear 2-4 parts, vitamin C 0.4-0.8 parts, vitamin E 0.4-0.8 parts, cellulose 1-2 parts, chicory root powder 0.1-0.3 parts, sago palm extract 0.1-0.3 parts, plant extract composition 0.4-1.2 parts, nanocrystalline curcumin 0.1-0.3 parts.

2. The pet food of plant extract composition for improving tear stains in dogs according to claim 1, characterized by, The plant extract composition includes the following components by weight: 0.1-0.3 parts of bilberry extract, 0.1-0.3 parts of medlar extract, 0.1-0.3 parts of cassia seed extract, and 0.1-0.3 parts of natural lutein.

3. The pet food of plant extract composition for improving tear stains in dogs according to claim 1 or 2, characterized in that, The duck meat is fresh duck meat, the snow pear is fresh snow pear, and the cassava starch is pregelatinized cassava starch.

4. A method of preparing a pet food of a plant extract composition for improving tear stains in dogs according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: S1. Weigh the duck meat and snow pear by weight fraction, and coarsely twist the duck meat and snow pear respectively; S2. Place the coarsely twisted duck meat and the weighed soybean enzymatic protein in an emulsifier for emulsification; S3. Weigh other raw and auxiliary materials by weight fraction, and put the product after emulsification in S2 into a blender for uniform stirring to obtain mixed raw materials; S4. Deliver the mixed raw materials obtained in S3 to a forming device to extrude into circular particles; S5. Lay the extruded particles on a net for air drying; S6. Deliver the air-dried particles to a metal detector through a cooling line; S7. Screen the qualified product through a vibrating screen to remove excess powder; S8. Package the finally qualified product into a packaging bag for sealing.

5. The method of making a pet food of a plant extract composition for improving tear stains in dogs according to claim 4, characterized in that, In the step S4, the vacuum degree of the forming device is set to 100%.

6. The method of making a pet food of a plant extract composition for improving tear stains in dogs according to claim 4, characterized in that, In the step S5, the air drying temperature is set to 70-80℃, and the air drying time is 8-10 hours.

7. The method of making a pet food of a plant extract composition for improving tear stains in dogs according to claim 4 or 6, characterized in that, In the step S5, the air drying moisture is below 14%.

8. The method of making a pet food of a plant extract composition for improving tear stains in dogs according to claim 4, characterized by, In the step S6, the cooling time of the cooling line for natural cooling is 3-5 min.

9. The method of making a pet food of a plant extract composition for improving tear stains in dogs according to claim 4, characterized by, In the step S6, the metal detector detects the sensitivity every hour using 1.5mm iron, 1.5mm non-iron, and 1.5mm stainless steel test blocks.

10. The method of making a pet food of a plant extract composition for improving tear stains in dogs according to claim 4, characterized by, In the step S1, the duck meat and snow pear are coarsely twisted through mesh plates with aperture of 16mm and 12mm respectively; in the step S2, the mesh plate aperture of the emulsifier is 4mm / 2.5mm / 1.5mm; in the step S4, the extrusion is circular particles with diameter of 8mm.

Images