Fermented liquid feed for promoting digestion in piglets and method for preparing the same

Abstract

The present application belongs to the technical field of breeding feed, and discloses a fermented liquid feed for promoting digestion of piglets and a preparation method thereof. Raw materials of the fermented liquid feed include water, grain energy feed, plant protein feed, compound probiotic agent, compound enzyme preparation, acidifying agent and intestinal function regulator. The preparation method comprises the following steps: S1, pretreatment and enzymolysis of raw materials; S2, aerobic fermentation; S3, anaerobic fermentation; and S4, post-treatment and filling. The present application has the following advantages: 1. Yeast and bacillus subtilis pre-digest raw materials in the aerobic stage, and lactic acid bacteria further degrade anti-nutritional factors in the anaerobic stage; 2. The product pH is controlled in the acidic range to form a natural antibacterial environment, and the synergistic effect of glutamic acid sodium and sodium butyrate promotes the development of intestinal villi and the repair of damaged intestinal mucosa; and 3. The enzymolysis pre-digestion step is set, and the compound enzyme preparation is used for deep enzymolysis of the feed raw materials, so that the product viscosity is significantly reduced, which is beneficial to the sucking and digestion of piglets.

Description

Technical Field

[0001] This invention relates to the field of animal feed technology, specifically to a fermented liquid feed that promotes digestion in piglets and its preparation method. Background Technology

[0002] Weaning is a critical period in pig farming. Weaning stress can lead to decreased appetite, insufficient digestive enzyme secretion, intestinal mucosal atrophy, and increased diarrhea rates in piglets, and in severe cases, even death, causing huge economic losses to the pig industry. Therefore, developing functional feeds that can promote piglet digestion and alleviate weaning stress is of great practical significance.

[0003] Liquid feed has been widely used in piglet farming in recent years due to its advantages such as being similar in form to breast milk, having good palatability, and being easy to consume. However, traditional liquid feed has the following technical drawbacks: (1) Heavy digestive burden: The protein and starch in conventional liquid feed are not pre-digested. The digestive enzyme system of piglets is not fully developed and it is difficult to fully decompose and absorb them, resulting in low feed utilization and frequent nutritional diarrhea.

[0004] (2) Insufficient maintenance of intestinal health: The intestinal flora of weaned piglets is in a disordered state. Traditional liquid feed lacks sufficient probiotics and organic acids, which cannot effectively inhibit the proliferation of pathogens (such as Escherichia coli and Salmonella) and also cannot promote the development of intestinal villi and the repair of the mucosal barrier.

[0005] (3) Simple fermentation process: Most existing fermented liquid feeds use single anaerobic fermentation or simple mixed fermentation, which fails to give full play to the synergistic effect of different probiotics. Yeast and Bacillus grow vigorously under aerobic conditions and can produce rich enzymes and growth factors, while lactic acid bacteria mainly produce acid under anaerobic conditions. The metabolic characteristics of both have not been fully utilized.

[0006] (4) Improper combination of functional additives: Although there are reports of adding acidifiers or probiotics in the existing technology, there is a lack of systematic formulation design for the intestinal physiological characteristics of piglets, and the synergistic effect between the components has not been fully explored. Summary of the Invention

[0007] To address the above problems, this invention provides a fermented liquid feed that promotes piglet digestion and its preparation method. This invention is achieved through the following technical solutions.

[0008] A fermented liquid feed for promoting digestion in piglets and its preparation method, wherein the fermented liquid feed is prepared by sequentially subjecting the following raw materials in parts by weight to aerobic fermentation and anaerobic fermentation: 60-100 parts water; 15-35 parts of cereal-based energy feed; 8-25 parts of plant protein feed; 1-6 parts of compound probiotic agent; 0.2–3 parts of compound enzyme preparation; Acidifying agent 0.2–1.5 parts; Intestinal function regulator 0.15-0.7 parts.

[0009] As a further embodiment of the present invention, the fermented liquid feed is prepared from raw materials comprising the following parts by weight: 40 parts water; 30 parts cereal energy feed; 20 parts plant protein feed; 5 parts compound probiotic agent; 2.5 parts compound enzyme preparation; 1.2 parts acidifier; and 0.55 parts intestinal function regulator.

[0010] As a further embodiment of the present invention, the cereal energy feed is puffed corn flour and / or puffed rice flour.

[0011] As a further embodiment of the present invention, the plant protein feed is enzymatically hydrolyzed soybean meal and / or fermented cottonseed protein.

[0012] As a further aspect of the present invention, the compound probiotic agent includes yeast, lactic acid bacteria and Bacillus subtilis; the initial live bacteria ratio of yeast, lactic acid bacteria and Bacillus subtilis is 1:3.2:0.8.

[0013] As a further embodiment of the present invention, the compound enzyme preparation comprises the following components in parts by weight: 1.25 parts of protease, 0.625 parts of amylase, and 0.625 parts of non-starch polysaccharide enzyme, wherein the non-starch polysaccharide enzyme is selected from at least one of xylanase, β-glucanase, and cellulase.

[0014] As a further embodiment of the present invention, the acidifying agent is one or more of lactic acid, citric acid, fumaric acid and phosphoric acid.

[0015] As a further embodiment of the present invention, the intestinal function regulator comprises 0.4 parts monosodium glutamate and 0.15 parts sodium butyrate. A method for preparing a fermented liquid feed that promotes digestion in piglets includes the following steps: S1, Raw material pretreatment and enzymatic hydrolysis: Mix 30 parts by weight of cereal energy feed and 20 parts by weight of plant protein feed, add 40 parts by weight of water, adjust the pH to 6.0-6.8, add 2.5 parts by weight of compound enzyme preparation, and enzymatically hydrolyze at 45-55℃ for 60-120 minutes to obtain enzymatic hydrolysate; S2, Aerobic fermentation: Cool the enzymatic hydrolysate obtained in step S1 to 30-35℃, add 1.0 part by weight of yeast and 0.8 parts by weight of Bacillus subtilis, control the dissolved oxygen to 0.5-2.0 mg / L, and carry out aerobic fermentation for 8-16 hours to obtain aerobic fermentation broth; S3, Anaerobic fermentation: Add 3.2 parts by weight of lactic acid bacteria, 1.2 parts by weight of acidifying agent, 0.4 parts by weight of monosodium glutamate and 0.15 parts by weight of sodium butyrate to the aerobic fermentation broth obtained in step S2. Seal the container and let it stand at 32-37°C for anaerobic fermentation for 24-48 hours until the pH drops to 3.8-4.5 to obtain the anaerobic fermentation broth. S4, Post-processing and filling: Cool the anaerobic fermentation liquid obtained in step S3 to below 15°C to terminate fermentation, and after homogenization, aseptically fill it to obtain the fermented liquid feed that promotes piglet digestion.

[0016] As a further embodiment of the present invention, after the enzymatic hydrolysis in step S1 is completed, the enzyme is subjected to high-temperature instantaneous inactivation treatment at 80-90°C for 30-60 seconds, and then rapidly cooled to 30-35°C.

[0017] The beneficial effects of this invention are as follows: 1. Employing a two-stage process of "aerobic fermentation followed by anaerobic fermentation," yeast and Bacillus subtilis secrete large amounts of extracellular enzymes during the aerobic stage to pre-digest feed ingredients, while lactic acid bacteria produce large amounts of acid during the anaerobic stage to further degrade anti-nutritional factors. The resulting product exhibits a significantly increased proportion of acid-soluble protein in the total protein, a marked increase in lactic acid content, and a substantial improvement in feed conversion efficiency, resulting in significantly better average daily weight gain for piglets compared to existing technologies.

[0018] 2. By fermenting with a high content of lactic acid bacteria, the product's pH is controlled within the acidic range, creating a natural antibacterial environment. Combined with the synergistic effect of monosodium glutamate and sodium butyrate, this promotes intestinal villus development and repairs damaged intestinal mucosa. Piglets show a significant increase in intestinal absorption area, a substantial reduction in diarrhea rate, and a significant enhancement of intestinal barrier function.

[0019] 3. An enzymatic pre-digestion step is incorporated before fermentation. The compound enzyme preparation deeply hydrolyzes the feed ingredients, significantly reducing the product viscosity and facilitating sucking and digestion by piglets. Simultaneously, through process control including enzyme inactivation treatment, pH feedback feeding, and homogenized filling, the product exhibits excellent storage stability and batch consistency, making it suitable for large-scale production. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 : A flowchart of a method for preparing a fermented liquid feed that promotes digestion in piglets. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, a fermented liquid feed for promoting digestion in piglets and its preparation method are disclosed. The fermented liquid feed is prepared by sequentially subjecting the following raw materials, in parts by weight, to aerobic fermentation and anaerobic fermentation: 60-100 parts water.

[0024] 15-35 portions of cereal-based energy feed.

[0025] Grain-based energy feeds are puffed corn flour and / or puffed rice flour.

[0026] 8-25 parts of plant protein feed.

[0027] The plant protein feed consists of enzymatically hydrolyzed soybean meal and / or fermented cottonseed protein.

[0028] 1 to 6 parts of compound probiotic agent.

[0029] The compound probiotic agent includes yeast, lactic acid bacteria and Bacillus subtilis; the initial live count ratio of yeast, lactic acid bacteria and Bacillus subtilis is 1:3.2:0.8.

[0030] 0.2 to 3 parts of compound enzyme preparation.

[0031] The compound enzyme preparation contains the following components in parts by weight: 1.25 parts of protease, 0.625 parts of amylase, and 0.625 parts of non-starch polysaccharide enzyme, wherein the non-starch polysaccharide enzyme is selected from at least one of xylanase, β-glucanase, and cellulase.

[0032] Acidifier 0.2 to 1.5 parts.

[0033] The acidifying agent is one or more of lactic acid, citric acid, fumaric acid, and phosphoric acid.

[0034] Intestinal function regulator 0.15-0.7 parts.

[0035] The intestinal function regulator consists of 0.4 parts monosodium glutamate and 0.15 parts sodium butyrate.

[0036] Preferably, the fermented liquid feed is prepared from the following raw materials in parts by weight: 40 parts water; 30 parts cereal energy feed; 20 parts plant protein feed; 5 parts compound probiotic agent; 2.5 parts compound enzyme preparation; 1.2 parts acidifier; and 0.55 parts intestinal function regulator.

[0037] A method for preparing a fermented liquid feed that promotes digestion in piglets includes the following steps: S1, Raw material pretreatment and enzymatic hydrolysis: Mix 30 parts by weight of cereal energy feed and 20 parts by weight of plant protein feed, add 40 parts by weight of water, adjust the pH to 6.0-6.8, add 2.5 parts by weight of compound enzyme preparation, and enzymatically hydrolyze at 45-55℃ for 60-120 minutes to obtain enzymatic hydrolysate.

[0038] After enzymatic hydrolysis, the enzyme is inactivated by high-temperature instantaneous treatment at 80-90℃ for 30-60 seconds, and then rapidly cooled to 30-35℃.

[0039] S2, Aerobic fermentation: Cool the enzymatic hydrolysate obtained in step S1 to 30-35°C, add 1.0 part by weight of yeast and 0.8 parts by weight of Bacillus subtilis, control the dissolved oxygen to 0.5-2.0 mg / L, and carry out aerobic fermentation for 8-16 hours to obtain aerobic fermentation broth.

[0040] S3, Anaerobic fermentation: Add 3.2 parts by weight of lactic acid bacteria, 1.2 parts by weight of acidifying agent, 0.4 parts by weight of monosodium glutamate and 0.15 parts by weight of sodium butyrate to the aerobic fermentation broth obtained in step S2. Seal the container and let it stand at 32-37°C for anaerobic fermentation for 24-48 hours until the pH drops to 3.8-4.5 to obtain the anaerobic fermentation broth.

[0041] S4, Post-processing and filling: Cool the anaerobic fermentation liquid obtained in step S3 to below 15°C to terminate fermentation, and after homogenization, aseptically fill it to obtain fermented liquid feed that promotes digestion in piglets.

[0042] One specific embodiment of the present invention is as follows: I. All raw materials used in the following examples are commercially available: Grain-based energy feeds: puffed corn flour (80 mesh), puffed rice flour (80 mesh).

[0043] Plant protein feed: enzymatically hydrolyzed soybean meal (crude protein ≥ 50%), fermented cottonseed protein (crude protein ≥ 55%).

[0044] Compound probiotic agent: yeast (Saccharomyces cerevisiae), lactic acid bacteria (Lactobacillus plantarum), and Bacillus subtilis are activated separately before use and then mixed at a live bacteria ratio of 1:3.2:0.8.

[0045] Compound enzyme preparations: protease (enzyme activity 100,000 U / g), amylase (enzyme activity 50,000 U / g), xylanase (enzyme activity 150,000 U / g).

[0046] Acidifying agents: lactic acid (food grade, purity ≥85%), citric acid (food grade, purity ≥99%).

[0047] Intestinal function regulators: Monosodium glutamate (food grade, purity ≥99%), sodium butyrate (feed grade, purity ≥98%). II. Implementation Examples Example 1

[0048] Raw material ratio (parts by weight): Water: 40 parts Puffed rice flour: 30 servings Fermented cottonseed protein: 20 servings Compound probiotic preparation: 5 parts (Yeast:Lactic acid bacteria:Bacillus subtilis live bacteria ratio = 1:3.2:0.8) Compound enzyme preparation: 2.5 parts (1.25 parts protease, 0.625 parts amylase, 0.625 parts non-starch polysaccharide enzyme, including 0.375 parts xylanase and 0.25 parts β-glucanase) Citric acid: 1.2 parts Monosodium glutamate: 0.4 parts Sodium butyrate: 0.15 parts Preparation steps: The preparation was carried out according to the above proportions, referring to the general preparation method in Part II. The enzymatic hydrolysis conditions were: 50℃ for 90 minutes; aerobic fermentation for 12 hours (dissolved oxygen 1.0 mg / L); and anaerobic fermentation for 36 hours (35℃). No enzyme inactivation treatment was performed.

[0049] Product specifications: pH 4.0, lactic acid content 1.7g / 100mL, acid-soluble protein accounts for 41.2% of total protein, viscosity 115mPa·s (25℃), viable lactic acid bacteria count 1.1× CFU / mL.

[0050] Example 2 (Lower Limit Ratio) Raw material ratio (parts by weight): Water: 60 parts Puffed corn flour: 15 parts Enzymatically hydrolyzed soybean meal: 8 portions Compound probiotic preparation: 1 part (in a ratio of 1:3.2:0.8) Compound enzyme preparation: 0.2 parts (in a ratio of 1.25:0.625:0.625) Lactic acid: 0.2 parts Monosodium glutamate: 0.1 parts Sodium butyrate: 0.05 parts Preparation steps: Refer to Example 1, the enzymatic hydrolysis conditions are 45℃ for 120 minutes; aerobic fermentation for 16 hours (dissolved oxygen 0.5 mg / L); anaerobic fermentation for 48 hours (32℃).

[0051] Product specifications: pH 4.3, lactic acid content 1.2g / 100mL, acid-soluble protein accounts for 35.8% of total protein, viscosity 138mPa·s (25℃), viable lactic acid bacteria count 5.2× CFU / mL.

[0052] Example 3 (Upper Range Ratio) Raw material ratio (parts by weight): Water: 100 parts 35 parts of a 1:1 mixture of puffed corn flour and puffed rice flour 25 portions of a 1:1 mixture of enzymatically hydrolyzed soybean meal and fermented cottonseed protein. Compound probiotic preparation: 6 parts (in a ratio of 1:3.2:0.8) Compound enzyme preparation: 3 parts (in a ratio of 1.25:0.625:0.625) 1.5 parts of a 1:1 mixture of lactic acid and citric acid. Monosodium glutamate: 0.5 parts Sodium butyrate: 0.2 parts Preparation steps: Refer to Example 1. Enzymatic hydrolysis conditions were 55℃ for 60 minutes; aerobic fermentation for 8 hours (dissolved oxygen 2.0 mg / L); and anaerobic fermentation for 24 hours (37℃). After enzymatic hydrolysis, enzyme inactivation treatment was performed (85℃ for 45 seconds).

[0053] Product specifications: pH 3.9, lactic acid content 1.6g / 100mL, acid-soluble protein accounts for 40.5% of total protein, viscosity 122mPa·s (25℃), viable lactic acid bacteria count 9.6× CFU / mL.

[0054] III. Comparison Example To verify the beneficial effects of the technical solution of the present invention, the following comparative examples are provided.

[0055] Comparative Example 1 (simple anaerobic fermentation, without an aerobic stage) The raw material ratio is exactly the same as in Example 1. The difference lies in the preparation method: the S2 aerobic fermentation step is omitted, and the enzymatic hydrolysate is directly cooled and then all the compound probiotic agents (yeast, lactic acid bacteria, and Bacillus subtilis are added at the same time), and sealed for anaerobic fermentation for 48 hours, with all other conditions being the same.

[0056] Product specifications: pH 4.2, lactic acid content 0.9g / 100mL, acid-soluble protein accounts for 29.7% of total protein, viscosity 198mPa·s (25℃), viable lactic acid bacteria count 3.8× CFU / mL.

[0057] Control Example 2 (without added intestinal function regulators) The raw material ratio is basically the same as in Example 1, except that monosodium glutamate and sodium butyrate are not added. The preparation method is the same as in Example 1.

[0058] Product specifications: pH 4.1, lactic acid content 1.6g / 100mL, acid-soluble protein accounts for 40.8% of total protein, viscosity 118mPa·s (25℃), viable lactic acid bacteria count 1.0× CFU / mL.

[0059] Control Example 3 (without added compound enzyme preparation) The raw material ratio is basically the same as in Example 1, except that no compound enzyme preparation is added. The preparation method is the same as in Example 1.

[0060] Product specifications: pH 4.5, lactic acid content 1.0g / 100mL, acid-soluble protein as a percentage of total protein 24.3%, viscosity 215mPa·s (25℃), viable lactic acid bacteria count 2.9× CFU / mL.

[0061] IV. Implementation Examples 4.1 Design of Piglet Feeding Experiment To verify the effect of the fermented liquid feed of this invention on the digestion of piglets, 160 21-day-old weaned piglets (Duroc × Landrace × Large White), with an initial weight of 6.5 ± 0.3 kg, were randomly divided into 5 groups, with 4 replicates per group and 8 piglets per replicate. The experimental period was 14 days. Example 1 group: fed with the fermented liquid feed prepared in Example 1 Example 2 group: fed with the fermented liquid feed prepared in Example 2 Example 3 group: fed with the fermented liquid feed prepared in Example 3 Control Group 1: Feeded with the feed prepared in Control Group 1 Control group 2: fed with the feed prepared in control group 2 Control group 3: fed with the feed prepared in control group 3 Control group: Commercially available liquid feed for piglets All groups were kept under the same feeding and management conditions, with free access to food and water, and were immunized according to the routine immunization program.

[0062] 4.2 Production performance measurement Weighing was performed at the beginning and end of the experiment, and daily food intake and diarrhea were recorded. The results are shown in Table 1.

[0063] Table 1. Effects of different feeds on the production performance of weaned piglets (experiment period 14 days)

[0064] Results Analysis: The average daily weight gain of the Example 1 group (optimal formulation) reached 200.0 g / d, significantly higher than that of the control group (135.0 g / d) and Control Example 1 group (134.3 g / d) (P<0.01). The Example 1 group had the lowest feed conversion ratio (1.39) and the highest feed conversion efficiency. Regarding the diarrhea rate, the Example 1 group (5.9%) was significantly lower than that of the control group (18.6%) and Control Example 1 group (16.3%). Although the effects of Example 2 group (lower limit of the range) and Example 3 group (upper limit of the range) were slightly lower than those of Example 1 group, they were still significantly better than all the control examples and the control group, indicating that the scope defined in claim 1 of this invention is reasonable and effective.

[0065] 4.3 Determination of intestinal digestive enzyme activity After the experiment, eight piglets were randomly selected from each group and slaughtered. The duodenal contents were collected to determine the activity of digestive enzymes. The results are shown in Table 2.

[0066] Table 2 Effects of different feeds on the activity of digestive enzymes in the small intestine of piglets

[0067] Results analysis: The activities of trypsin, amylase and lipase in piglets in Example 1 group were significantly higher than those in the control group and control group (P<0.05), indicating that the feed of the present invention can effectively promote the secretion of endogenous digestive enzymes in piglets, thereby improving feed digestibility.

[0068] 4.4 Observation of intestinal morphology Duodenal tissue was collected, stained with hematoxylin and eosin (HE), and the villus height and crypt depth were measured. The results are shown in Table 3.

[0069] Table 3 Effects of different feeds on the morphology of duodenal mucosa in piglets

[0070] Results analysis: The duodenal villus height of piglets in the Example 1 group reached 422 μm, and the villus height / crypt depth ratio reached 3.40, which was much higher than that of the control group (1.86), indicating that the feed of the present invention can significantly promote the development of intestinal mucosa and enhance nutrient absorption capacity.

[0071] V. Verification of Process Parameters To verify the rationality of the process parameters in the preparation method of the present invention, based on the ratio of Example 1, the effects of enzymatic hydrolysis temperature, aerobic fermentation time, and anaerobic fermentation pH on the key indicators of the product were investigated.

[0072] Table 4. Effect of enzymatic hydrolysis temperature on the proportion of acid-soluble proteins

[0073] The results showed that when the enzymatic hydrolysis temperature was 45-55℃, the proportion of acid-soluble protein reached more than 35%, with the optimal temperature being 50℃.

[0074] Table 5. Effects of aerobic fermentation time on subsequent proliferation of lactic acid bacteria

[0075] The results showed that aerobic fermentation for 8–16 hours was conducive to the full growth of yeast and Bacillus subtilis, creating favorable conditions for subsequent anaerobic fermentation by lactic acid bacteria, with the optimal time being 12 hours.

[0076] Table 6. Effects of anaerobic fermentation termination pH on lactic acid content and stability of the product.

[0077] The results showed that the product exhibited good lactic acid content and stability when the pH range was 3.8–4.5, with the optimal range being 4.0.

[0078] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A fermented liquid feed that promotes digestion in piglets, characterized in that, The fermented liquid feed is prepared from raw materials comprising the following parts by weight through sequential aerobic fermentation and anaerobic fermentation: 60-100 parts water; 15-35 parts of cereal-based energy feed; 8-25 parts of plant protein feed; 1-6 parts of compound probiotic agent; 0.2–3 parts of compound enzyme preparation; Acidifying agent 0.2–1.5 parts; Intestinal function regulator 0.15-0.7 parts.

2. The fermented liquid feed for promoting digestion in piglets according to claim 1, characterized in that, The fermented liquid feed is prepared from the following raw materials in parts by weight: 40 parts water; 30 parts cereal energy feed; 20 parts plant protein feed; 5 parts compound probiotic agent; 2.5 parts compound enzyme preparation; and 1.2 parts acidifier. 0.55 parts of intestinal function regulator.

3. The fermented liquid feed for promoting piglet digestion according to claim 1, characterized in that, The cereal-based energy feed is puffed corn flour and / or puffed rice flour.

4. The fermented liquid feed for promoting digestion in piglets according to claim 1, characterized in that, The plant protein feed is enzymatically hydrolyzed soybean meal and / or fermented cottonseed protein.

5. The fermented liquid feed for promoting piglet digestion according to claim 1, characterized in that, The compound probiotic agent includes yeast, lactic acid bacteria and Bacillus subtilis; the initial live count ratio of yeast, lactic acid bacteria and Bacillus subtilis is 1:3.2:0.

8.

6. The fermented liquid feed for promoting piglet digestion according to claim 1, characterized in that, The compound enzyme preparation comprises the following components in parts by weight: 1.25 parts of protease, 0.625 parts of amylase, and 0.625 parts of non-starch polysaccharide enzyme, wherein the non-starch polysaccharide enzyme is selected from at least one of xylanase, β-glucanase, and cellulase.

7. The fermented liquid feed for promoting piglet digestion according to claim 1, characterized in that, The acidifying agent is one or more of lactic acid, citric acid, fumaric acid, and phosphoric acid.

8. The fermented liquid feed for promoting piglet digestion according to claim 1, characterized in that, The intestinal function regulator comprises 0.4 parts sodium glutamate and 0.15 parts sodium butyrate.

9. A method for preparing a fermented liquid feed that promotes digestion in piglets, characterized in that, Includes the following steps: S1, Raw material pretreatment and enzymatic hydrolysis: Mix 30 parts by weight of cereal energy feed and 20 parts by weight of plant protein feed, add 40 parts by weight of water, adjust the pH to 6.0-6.8, add 2.5 parts by weight of compound enzyme preparation, and enzymatically hydrolyze at 45-55℃ for 60-120 minutes to obtain enzymatic hydrolysate; S2, Aerobic fermentation: Cool the enzymatic hydrolysate obtained in step S1 to 30-35℃, add 1.0 part by weight of yeast and 0.8 parts by weight of Bacillus subtilis, control the dissolved oxygen to 0.5-2.0 mg / L, and carry out aerobic fermentation for 8-16 hours to obtain aerobic fermentation broth; S3, Anaerobic fermentation: Add 3.2 parts by weight of lactic acid bacteria, 1.2 parts by weight of acidifying agent, 0.4 parts by weight of monosodium glutamate and 0.15 parts by weight of sodium butyrate to the aerobic fermentation broth obtained in step S2. Seal the container and let it stand at 32-37°C for anaerobic fermentation for 24-48 hours until the pH drops to 3.8-4.5 to obtain the anaerobic fermentation broth. S4, Post-processing and filling: Cool the anaerobic fermentation liquid obtained in step S3 to below 15°C to terminate fermentation, and after homogenization, aseptically fill it to obtain the fermented liquid feed that promotes piglet digestion.

10. A method for preparing a fermented liquid feed to promote piglet digestion according to claim 9, characterized in that, After the enzymatic hydrolysis described in step S1 is completed, the enzyme is inactivated by high-temperature instantaneous treatment at 80-90°C for 30-60 seconds, and then rapidly cooled to 30-35°C.

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