Composite dietary fiber for improving production performance of sows as well as preparation method and application of composite dietary fiber

Abstract

The invention discloses a composite dietary fiber for improving the production performance of sows as well as a preparation method and application of the composite dietary fiber, and belongs to the technical field of feeds. Comprising the following raw materials in parts by weight: 25-35 parts of jerusalem artichoke fibers, 10-15 parts of konjac glucomannan, 20-28 parts of alfalfa fibers, 15-20 parts of wheat araboxylan, 1-3 parts of a compound enzyme preparation, 2-3.2 parts of phosphomonoester starch and 3-4.8 parts of maltodextrin. According to the composite dietary fiber for improving the production performance of the sows as well as the preparation method and the application of the composite dietary fiber, dual optimization of physical environment and micro-ecology of intestinal tracts of the sows, stomach protection of functional components and targeted slow release of the intestinal tracts are realized, so that pregnancy constipation is effectively relieved, body fat deposition is controlled, and the production performance of the sows is improved. The feed intake and the lactation performance in the lactation period are improved, and the production efficiency of the sows is comprehensively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of feed, in particular to a compound dietary fiber for improving the production performance of sows and a preparation method and application thereof. BACKGROUND

[0002] Sows, especially sows in the late pregnancy and lactation period, have complex physiological states, and have high requirements for nutrition management and intestinal health. In the late pregnancy, with the rapid development of fetuses and the increase in uterine volume, the abdominal cavity pressure of sows increases significantly, the intestinal peristalsis is physically compressed, and combined with the influence of feeding mode (mostly limited feeding) and hormone level change, constipation becomes a high-incidence problem. Constipation not only causes sows to be in pain, irritable, and to reduce feed intake, but also causes inflammation due to the accumulation of intestinal toxins, and affects fetal development and subsequent delivery. After entering the lactation period, sows need to provide huge nutritional support for high milk yield, and the demand for feed intake and metabolic pressure increases. At this time, intestinal health directly determines the nutrient absorption efficiency, immune status and lactation performance. Intestinal dysfunction will lead to substandard feed intake, decreased milk quality, increased diarrhea rate of piglets, and seriously affect the body condition recovery and estrus of sows after weaning.

[0003] In order to solve the above problems, adding dietary fiber in the diet of sows has become an important nutrition strategy. Dietary fiber can effectively improve the volume of intestinal contents, promote peristalsis, regulate the flora, and provide fermentation substrates for the hindgut probiotics through its unique physicochemical properties (such as water holding capacity, swelling, fermentability).

[0004] At present, the dietary fiber products applied to sows are mainly derived from a single source of flavor, such as bran (mainly containing arabinoxylan), sugar beet meal (containing pectin, cellulose), soybean hull (containing cellulose, hemicellulose) and the like. Such products have single source and unbalanced fiber composition. For example, although bran can promote peristalsis, its fiber fermentation speed is relatively fast, and excessive use can cause excessive gas at the front end of the intestine, causing bloating; and the proportion of insoluble fiber in soybean hull is too high, although it can increase the volume of feces, but the fermentation utilization rate is low, which may reduce the overall energy concentration of the diet. SUMMARY

[0005] The purpose of the present application is to provide a compound dietary fiber for improving the production performance of sows and a preparation method and application thereof. Through scientific compounding of water-soluble and water-insoluble dietary fibers, and combining with directional enzymatic modification and composite carrier embedding technology, the physical environment and microecology of the intestinal tract of sows are optimized, and the gastric protection and intestinal tract targeted slow release of functional ingredients are realized, so as to effectively relieve pregnancy constipation, control body fat deposition, and improve the feed intake and lactation performance in the lactation period, and comprehensively improve the production efficiency of sows.

[0006] In order to achieve the above object, the application provides a compound dietary fiber for improving the production performance of sows, which comprises the following raw materials in mass fraction: 25-35 parts of jerusalem artichoke fiber, 10-15 parts of konjac glucomannan, 20-28 parts of alfalfa fiber, 15-20 parts of wheat arabinoxylan, 1-3 parts of compound enzyme preparation, 2-3.2 parts of monophosphate starch, and 3-4.8 parts of malt dextrin.

[0007] Preferably, the compound enzyme preparation is composed of xylanase, beta-glucanase and pectinase in a mass ratio of 2:1:1.

[0008] The application further provides a preparation method of the compound dietary fiber for improving the production performance of sows, which comprises the following steps: S1, raw material pretreatment: crushing the alfalfa fiber and then performing microwave treatment, and drying the jerusalem artichoke fiber, konjac glucomannan and wheat arabinoxylan respectively; S2, mixing the pretreated alfalfa fiber and wheat arabinoxylan with the compound enzyme preparation to perform enzymolysis, so as to obtain an enzymolysis fiber slurry; S3, mixing the enzymolysis fiber slurry obtained in S2 with the pretreated jerusalem artichoke fiber and konjac glucomannan in S1, and then adding monophosphate starch and malt dextrin to perform homogenization treatment, so as to obtain a homogenized embedding precursor slurry; S4, performing spray drying on the homogenized embedding precursor slurry, and then cooling, sieving, so as to obtain the compound dietary fiber.

[0009] Preferably, in S1, the alfalfa fiber is crushed to 80-100 mesh, and is subjected to microwave treatment at a power of 300-400 W for 2-3 min; the jerusalem artichoke fiber, konjac glucomannan and wheat arabinoxylan are dried at 60-70 DEG C until the water content is less than 8%.

[0010] Preferably, in S2, when performing enzymolysis, 5-8 times of deionized water of the total mass of the pretreated alfalfa fiber and wheat arabinoxylan and the compound enzyme preparation is added, and then the pH is adjusted to 5-5.5, and the enzymolysis is performed at 45-50 DEG C for 3-4 h.

[0011] Preferably, in S2, after the enzymolysis, high-temperature sterilization is performed, the temperature of the high-temperature sterilization is 90-95 DEG C, and the high-temperature sterilization time is 10-15 min.

[0012] Preferably, in S3, after adding the monophosphate starch and malt dextrin, uniform stirring is performed, deionized water is added, the solid content of the slurry is adjusted to 25-30%, and the slurry is sent into a high-pressure homogenizer to perform homogenization treatment under the condition of 20-25 MPa for 2-3 times, and the homogenization time of each time is 3-5 min.

[0013] Preferably, in S4, the spray drying parameters are: inlet temperature 80-85 DEG C, outlet temperature 45-50 DEG C, atomizer rotation speed 18000-20000 r / min, and feeding speed 10-15 L / h; after cooling to room temperature, the product is sieved through a 60-80 mesh sieve.

[0014] The application further provides a use of the compound dietary fiber for improving the production performance of sows.

[0015] Preferably, the improvement of the production performance of sows comprises: improvement of constipation and body fat deposition in the late gestation period, and / or regulation of intestinal flora and improvement of lactation yield in the lactation period, and the specific operation is as follows: T1, adding the compound dietary fiber at 3-5% of the mass of the pig feed before 85 days of pregnancy to delivery; T2, adding the compound dietary fiber at 2-3% of the mass of the pig feed after delivery to weaning.

[0016] Therefore, the compound dietary fiber for improving the production performance of sows, the preparation method and the use thereof have the following beneficial effects: (1) By compounding the water-soluble fiber (Jerusalem artichoke fiber, konjac glucomannan) and the non-water-soluble fiber (alfalfa fiber, wheat arabinoxylan) at a specific ratio, the product has the dual functions of promoting the fermentation of probiotics to produce short-chain fatty acids and increasing the volume of feces and stimulating intestinal peristalsis; (2) The specific complex enzyme preparation (xylanase: beta-glucanase: pectinase = 2:1:1) is used for directional enzymolysis of the alfalfa fiber and the wheat arabinoxylan, which can effectively degrade the anti-nutritional factors, release small molecular oligosaccharides and destroy the dense structure of the fiber; (3) The phosphate monoester starch and the maltodextrin are combined to form a compound embedding carrier at a specific mass ratio, and the combination produces a synergistic effect: the phosphate monoester starch provides a skeleton protection against gastric acid, the maltodextrin promotes dispersion and dissolution, and the combination of the two enables the product to have the targeted delivery function of protection in the stomach and slow release in the intestine; (4) In the late gestation period, the application can effectively relieve constipation and control excessive body fat deposition; in the lactation period, the application can improve the feed intake, enhance the lactation performance and improve the health of piglets.

[0017] The technical solutions of the application are further described in detail through the following examples. DETAILED DESCRIPTION

[0018] The technical solutions of the application are further described in detail through the following examples.

[0019] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as those commonly understood by a person of ordinary skill in the art to which the present application belongs.

[0020] In the present application, unless otherwise specified, other test materials and instruments and equipment are conventional test materials in the art, which can be purchased through commercial channels.

[0021] Example 1 The present application provides a kind of compound dietary fiber for improving sow production performance, including the following raw materials by mass fraction: 30 parts of jerusalem artichoke fiber, 12 parts of konjac glucomannan, 24 parts of alfalfa fiber, 18 parts of wheat arabinoxylan, 2 parts of compound enzyme preparation (xylanase: β-glucanase: pectinase = 2:1:1), 2.6 parts of monophosphate starch, 3.9 parts of malt dextrin.

[0022] The preparation method of the compound dietary fiber comprises the following steps: Raw material pretreatment: the alfalfa fiber is crushed to 80 mesh, and microwave treatment is carried out at 350 W power for 2.5 min. The jerusalem artichoke fiber, konjac glucomannan and wheat arabinoxylan are dried in an oven at 65 DEG C to a moisture content of 7.5%; Directional enzymolysis: the pretreated alfalfa fiber and wheat arabinoxylan are mixed with the compound enzyme preparation, deionized water is added at 6 times the total mass of the raw materials, the pH is adjusted to 5.3, and enzymolysis is carried out at 48 DEG C for 3.5 h. Then, the temperature is raised to 93 DEG C, and high-temperature sterilization is carried out for 12 min to obtain an enzymolysis fiber slurry; Mixing and homogenization: the enzymolysis fiber slurry is mixed with the dried jerusalem artichoke fiber and konjac glucomannan, and the monophosphate starch and malt dextrin are added. After stirring uniformly, deionized water is added to adjust the solid content of the slurry to 28%. The slurry is high-pressure homogenized at 22 MPa pressure for 2 times, 4 min each time, to obtain a homogenized embedding precursor slurry; Spray drying embedding: the precursor slurry is centrifugally spray dried, and the parameters are: inlet air temperature 83 DEG C, outlet air temperature 48 DEG C, atomizer speed 19000 r / min, and feeding speed 12 L / h. The particles are collected, cooled to room temperature, and then passed through a 70 mesh sieve to obtain the finished compound dietary fiber.

[0023] Example 2 The only difference between this embodiment and example 1 is that the compound dietary fiber includes the following raw materials by mass fraction: 25 parts of jerusalem artichoke fiber, 10 parts of konjac glucomannan, 20 parts of alfalfa fiber, 15 parts of wheat arabinoxylan, 1 part of compound enzyme preparation, 2 parts of monophosphate starch, and 3 parts of malt dextrin.

[0024] The preparation method is the same as example 1.

[0025] Example 3 The only difference between this embodiment and embodiment 1 is that the composite dietary fiber comprises the following raw materials in parts by mass: jerusalem artichoke fiber 35 parts, konjac glucomannan 15 parts, alfalfa fiber 28 parts, wheat arabinoxylan 20 parts, composite enzyme preparation 3 parts, monoester phosphate starch 3.2 parts, and malt dextrin 4.8 parts.

[0026] The preparation method is the same as that of embodiment 1.

[0027] Comparative example 1 The only difference between this comparative example and embodiment 1 is that the composite dietary fiber comprises the following raw materials in parts by mass: jerusalem artichoke fiber 42 parts, alfalfa fiber 24 parts, wheat arabinoxylan 18 parts, composite enzyme preparation (xylanase: β-glucanase: pectinase = 2: 1: 1) 2 parts, monoester phosphate starch 2.6 parts, and malt dextrin 3.9 parts.

[0028] The preparation method is the same as that of embodiment 1.

[0029] Comparative example 2 The only difference between this comparative example and embodiment 1 is that the step of S2 directional enzymolysis is cancelled. That is, the pretreated alfalfa fiber and wheat arabinoxylan are not subjected to enzymolysis, but are directly mixed with the subsequent raw materials such as jerusalem artichoke fiber and konjac glucomannan. The composite enzyme preparation is not added, and the other conditions are the same.

[0030] Comparative example 3 The only difference between this comparative example and embodiment 1 is that the addition of monoester phosphate starch and malt dextrin is cancelled, and the step of spray drying is also cancelled. That is, the two carriers are not added in the S3 step, and the mixed and homogenized slurry is directly dried in an oven at 65°C, crushed, and passed through a 70-mesh sieve. The other conditions are the same.

[0031] Comparative example 4 The only difference between this comparative example and embodiment 1 is that 6 parts of malt dextrin are used to replace the composite carrier of monoester phosphate starch + malt dextrin. That is, the monoester phosphate starch is removed, and the amount of malt dextrin is adjusted from 3.6 parts to 6 parts. The other conditions are the same.

[0032] I. In-vitro performance indicators: The composite dietary fibers obtained in examples 1-3 and comparative examples 1-4 are subjected to in-vitro performance tests. The effect of improving the texture of feces and enhancing satiety of the composite dietary fiber is evaluated by measuring the water holding capacity, and the effect of promoting peristalsis and reducing excessive feeding of the composite dietary fiber is evaluated by measuring the swelling property. The results are shown in Table 1.

[0033] Table 1

[0034] From Table 1, it can be seen that Examples 1-3 all exhibit excellent water holding capacity. Comparative Example 1 shows a significant decrease in water holding capacity, demonstrating the synergistic effect with Jerusalem artichoke fiber. Comparative Example 2 shows the lowest water holding capacity, demonstrating that enzymatic pretreatment is a key step to open the fiber structure and improve water holding capacity.

[0035] Swelling results are consistent with water holding capacity trends. Comparative Example 1 and Comparative Example 2 show significantly worse swelling than the Examples, further demonstrating the fundamental role of raw material complete matching and enzymatic process to achieve fiber physical function (increasing stool volume, promoting peristalsis).

[0036] II. In vitro simulated digestion: 1. Preparation of simulated digestion solution: Simulated gastric fluid (SGF): Take pepsin (≥2500 U / mg) in 0.1M HCl solution, make up to volume, so that its final concentration is 3.2 mg / mL. Before use, adjust pH to 2.0±0.1 with 1M HCl.

[0037] Simulated intestinal fluid (SIF): Take pancreatin (trypsin activity ≥25 U / mg) and bile salt in 0.1M NaHCO3 solution, make up to volume, so that the final concentration of pancreatin is 10 mg / mL, and the final concentration of bile salt is 3.5 mg / mL. Before use, adjust pH to 6.8±0.1 with 1M NaOH.

[0038] 2. In vitro digestion and sampling process: Steps: Gastric digestion stage: accurately weigh 1.000 g of sample ( m total ) into a 100 mL conical flask, add 20 mL of simulated gastric fluid (SGF) preheated to 37°C, and place in a constant temperature shaking water bath at 37°C and 100 rpm.

[0039] Gastric stage sampling: at 30, 60, 90, 120 minutes after the start of digestion, respectively, 1.0 mL of the digestion solution was taken with a syringe, immediately filtered through a 0.45 μm filter membrane, and the filtrate was stored at -20°C for determination of total sugar release (representing the dissolution of fiber and other components). After sampling, an equal volume of fresh SGF at the same temperature was added to maintain the system constant.

[0040] Intestinal digestion stage: after 2 hours of gastric digestion, the pH of the mixture was quickly adjusted to 6.8 with 1M NaHCO3, and 20 mL of simulated intestinal fluid (SIF) preheated to 37°C was added.

[0041] Intestinal stage sampling: at 1, 2, 4, 6, 8 hours after the start of intestinal digestion, 1.0 mL was sampled in the same way, filtered and stored.

[0042] Determination and calculation: the total sugar content in all sample filtrates was determined by phenol-sulfuric acid method. The cumulative release rate at each time point was calculated based on the theoretical total releasable sugar amount in the sample as 100%.

[0043] ; The results are shown in Table 2.

[0044] Table 2

[0045] As can be seen from Table 2, the gastric juice release rates of Examples 1-3 are significantly lower than those of the respective comparative examples. Comparative Example 3 and Comparative Example 4 have extremely high release rates, proving that the phosphoric acid monoester starch and maltodextrin compounded at a ratio of 2:3 produce a synergistic protective effect, and the gastric acid resistance is significantly better than that of a single carrier or no carrier.

[0046] Moreover, the product of Example exhibits ideal long-acting slow-release properties in intestinal juice. Comparative Example 3 and Comparative Example 4 lack effective composite carriers, and the active ingredients are rapidly released in the early stage of intestinal juice, which cannot achieve long-acting effect. This proves that the composite carrier system has excellent effect in achieving targeted intestinal tract and slow release function.

[0047] III. Animal feeding: 1. Test animals and grouping: Animals: healthy pregnant sows of similar breed, parity and body weight (such as long × large crossbred sows) were selected, and the test was started at 85 days of pregnancy.

[0048] Grouping: randomly divided into 7 groups, with no less than 8 sows in each group (to ensure statistical effectiveness).

[0049] Control group: fed with basic diet.

[0050] Example 1 group: basic diet + product of Example 1 (4% in pregnancy period, 2.5% in lactation period).

[0051] Example 2 group: basic diet + product of Example 2 (5% in pregnancy period, 2.5% in lactation period).

[0052] Example 3 group: basic diet + product of Example 3 (3% in pregnancy period, 2.5% in lactation period).

[0053] Comparative Example 1, 2, 3 / 4 group: respectively added with corresponding products, and the addition ratio was referred to Example 1 or adjusted according to pre-test.

[0054] 2. Feeding management: All sows were fed in the same standardized pig house with consistent environmental conditions.

[0055] Pregnant sows were subjected to limited feeding, and lactating sows were allowed to freely eat and drink water.

[0056] The test period lasted from 85 days of pregnancy to weaning of piglets (21-28 days of age).

[0057] 3. Determination index and sample collection: Production performance index: Constipation index: The feces score was recorded daily during pregnancy (1 point: water-like stool; 2 points: soft stool; 3 points: normal; 4 points: dry and hard; 5 points: granular hard stool), and the average score was calculated.

[0058] Backfat thickness: The backfat thickness at P2 point (6.5 cm from the back midline at the last rib) was measured at 85 days of pregnancy, the day of delivery, and the day of weaning using a backfat instrument, and the change in backfat was calculated.

[0059] Feed intake: The average daily feed intake of sows during lactation was recorded.

[0060] Lactation performance: The birth litter weight and 21-day-old litter weight were recorded, and the average daily weight gain and weaning survival rate were calculated. The feed conversion rate was estimated by "piglet weight gain / sow feed intake".

[0061] Sample collection and laboratory analysis: Fecal sample: Fresh feces were collected at the middle and late stages of the test and stored at -80°C.

[0062] Short-chain fatty acid (SCFA) analysis: The contents of acetic acid, propionic acid, butyric acid, etc. in feces were determined by gas chromatography to evaluate the intestinal fermentation status.

[0063] Microbiota analysis: The 16S rRNA high-throughput sequencing technology was used to analyze the fecal microbial diversity and the relative abundance of beneficial bacteria (such as Lactobacillus and Bifidobacterium).

[0064] Blood sample: Blood was collected from the vena cava before delivery, and serum was separated to determine the indicators related to inflammation and metabolism (such as IL-6, TNF-α, and insulin).

[0065] The results are shown in Tables 3 and 4.

[0066] Table 3

[0067] As shown in Table 3, the constipation index of Examples 1-3 was extremely significantly reduced (P<0.01), and the effect was significantly better than that of each comparative example. The backfat thickness of the example group was significantly less than that of the control group (P<0.01), indicating that excessive body fat deposition was effectively controlled. The fecal SCFA content of the example group was extremely significantly increased (P<0.01), indicating that fiber was efficiently fermented by beneficial bacteria in the hindgut, verifying the prebiotic effect and microecological regulation potential of fiber.

[0068] Table 4

[0069] As can be seen from Table 4, the example group significantly improves the feed intake of lactating sows, and extremely significantly increases the weaning litter weight (P<0.01), indicating that the lactation of sows is improved, the example group significantly reduces the diarrhea rate of piglets (P<0.01), which is directly related to the improvement of intestinal health of sows and the improvement of milk quality, and the example group significantly improves the relative abundance of probiotics (lactobacillus) in the feces of sows (P<0.01), which confirms the role of regulating intestinal microecology from the perspective of microorganisms.

[0070] In summary, examples 1-3 all show excellent and stable performance in a wide range, while the indicators of comparative example 1 significantly decrease, proving the necessity and synergistic effect of the combination of the four fibers in a specific ratio, and the effect cannot be achieved by a single component or simple combination.

[0071] Comparative example 2 is one of the worst in water holding capacity, swelling and feeding effect, proving that directional enzymolysis of the compound enzyme preparation is the key to improving the function of fiber and is not an obvious process step.

[0072] Comparative example 3 and comparative example 4 show the defects of a large amount of release in the stomach and no slow release in the intestine in in vitro simulation digestion, resulting in the loss of efficacy in animal experiments. This strongly proves that the compound carrier composed of phosphoric monoester starch and maltodextrin in a mass ratio of 2:3 has synergistic effect and outstanding technical effect in achieving stomach protection and intestinal targeted slow release.

[0073] Therefore, the application adopts the above-mentioned compound dietary fiber for improving the production performance of sows, and the preparation method and application thereof, which realizes the double optimization of the intestinal physical environment and microecology of sows, and the stomach protection and intestinal targeted slow release of functional ingredients by scientific compounding of water-soluble and water-insoluble dietary fibers, and combining directional enzymatic modification and compound carrier embedding technology, thereby effectively relieving pregnancy constipation, controlling body fat deposition, improving feed intake and lactation performance during lactation, and comprehensively improving the production efficiency of sows.

[0074] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application but not to limit it, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or equivalently replaced, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A compound dietary fiber for improving sow reproductive performance, characterized in that: The ingredients, by weight, include the following: 25-35 parts Jerusalem artichoke fiber, 10-15 parts konjac glucomannan, 20-28 parts alfalfa fiber, 15-20 parts wheat arabinoxylan, 1-3 parts compound enzyme preparation, 2-3.2 parts phosphate monoester starch, and 3-4.8 parts maltodextrin.

2. The compound dietary fiber for improving sow reproductive performance according to claim 1, characterized in that: The compound enzyme preparation consists of xylanase, β-glucanase and pectinase in a mass ratio of 2:1:

1.

3. A method for preparing a compound dietary fiber for improving sow reproductive performance as described in any one of claims 1-2, characterized in that: Includes the following steps: S1. Raw material pretreatment: Alfalfa fiber is crushed and microwaved, while Jerusalem artichoke fiber, konjac glucomannan and wheat arabinoxylan are dried separately. S2. Pretreated alfalfa fiber, wheat arabinoxylan and compound enzyme preparation are mixed and enzymatically hydrolyzed to obtain enzymatically hydrolyzed fiber slurry; S3. Mix the enzymatically hydrolyzed fiber slurry obtained in S2 with the pretreated Jerusalem artichoke fiber and konjac glucomannan in S1, and then add phosphate monoester starch and maltodextrin for homogenization to obtain a homogenized encapsulation precursor slurry. S4. The homogenized encapsulation precursor slurry is spray-dried, then cooled and sieved to obtain composite dietary fiber.

4. The method for preparing a compound dietary fiber for improving sow reproductive performance according to claim 3, characterized in that: In S1, alfalfa fiber is pulverized to 80-100 mesh and microwaved at 300-400W for 2-3 minutes; Jerusalem artichoke fiber, konjac glucomannan, and wheat arabinoxylan are dried at 60-70℃ until the moisture content is less than 8%.

5. The method for preparing a compound dietary fiber for improving sow reproductive performance according to claim 3, characterized in that: In S2, during enzymatic hydrolysis, add 5-8 times the total mass of pretreated alfalfa fiber, wheat arabinoxylan, and compound enzyme preparation in deionized water, then adjust the pH to 5-5.5, and enzymatically hydrolyze for 3-4 hours at 45-50℃.

6. The method for preparing a compound dietary fiber for improving sow reproductive performance according to claim 3, characterized in that: In S2, after enzymatic hydrolysis, high-temperature sterilization is performed at a temperature of 90-95℃ for 10-15 minutes.

7. The method for preparing a compound dietary fiber for improving sow reproductive performance according to claim 3, characterized in that: In S3, add phosphate monoester starch and maltodextrin and stir evenly. Add deionized water to adjust the slurry solid content to 25-30%. Send the slurry into a high-pressure homogenizer and homogenize it 2-3 times under 20-25 MPa conditions, with each homogenization time being 3-5 minutes.

8. The method for preparing a compound dietary fiber for improving sow reproductive performance according to claim 3, characterized in that: In S4, the spray drying parameters are: inlet temperature 80-85℃, outlet temperature 45-50℃, atomizer speed 18000-20000r / min, and feed rate 10-15L / h; after cooling to room temperature, it is passed through a 60-80 mesh sieve.

9. An application of a compound dietary fiber for improving sow reproductive performance, characterized in that: The compound dietary fiber for improving sow reproductive performance as described in any one of claims 1-2 is applied to pig feed.

10. The application of the compound dietary fiber for improving sow reproductive performance according to claim 9, characterized in that: The improvement of sow reproductive performance includes: improving constipation and body fat deposition in late gestation, and / or regulating gut microbiota and increasing milk production during lactation, specifically through the following procedures: T1. From 85 days of gestation until delivery, add compound dietary fiber at 3-5% of the weight of pig feed. T2. After farrowing and before weaning, add compound dietary fiber at 2-3% of the weight of pig feed.

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