Composite feed additive, preparation method and application thereof

Abstract

The application relates to the technical field of feed additives, and particularly discloses a compound feed additive as well as a preparation method and application thereof. The compound feed additive provided by the application comprises the following components in parts by weight: saw leaf palm extract 1-8 parts, white birch mushroom extract 1-5 parts, Rhizoma Anemarrhenae extract 0.5-2.5 parts, raspberry extract 20-30 parts, sea-tortoise skin extract 3-5 parts, compound bacteria 3-5 parts and carrier 10-30 parts; further, the compound bacteria are selected from Enterococcus faecium, Bacillus laterosporus, Acetobacter orleanensis, Lactobacillus acidophilus and Lactobacillus rhamnosus; and the application also provides animal feed prepared from the compound feed additive. The compound feed additive provided by the application can improve the growth performance of animals from aspects of enhancing the immunity of animals, improving the intestinal microorganism balance of animals, improving the feed conversion rate and the like, so as to improve the breeding benefit of livestock and poultry breeding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of feed additives, in particular to a compound feed additive and a preparation method and application thereof. BACKGROUND

[0002] With the rapid development of animal husbandry, feed additives play an increasingly important role in improving animal production performance, ensuring animal health, etc. High-quality feed additives can improve the nutritional structure of feed, enhance the immunity of animals, reduce the occurrence of diseases, thereby improving breeding efficiency and promoting the development of animal husbandry towards scale and intensification. At the same time, people's requirements for the quality and safety of livestock products are also getting higher and higher, which also promotes the continuous innovation and development of the feed additive industry.

[0003] In order to improve the nutritional value of feed and promote animal growth, common methods include adding antibiotics, adding chemical synthetic drugs, etc. to feed additives. Among them, the method of adding antibiotics can quickly and effectively inhibit the growth and reproduction of harmful microorganisms in the animal body, thereby preventing and treating diseases and improving feed utilization; however, long-term use of antibiotics can lead to drug resistance of bacteria in the animal body, not only reducing the therapeutic effect of antibiotics, but also possibly passing through the food chain to humans, threatening public health safety. The method of using chemical synthetic drugs can solve some specific problems in the growth process of animals, such as promoting digestion and absorption, enhancing metabolic function, etc., but this method may have chemical synthetic drug residue problems, affecting the quality and safety of livestock products.

[0004] Therefore, it is necessary to develop a compound feed additive that can meet the needs of promoting animal growth, ensuring animal and food health, etc., so as to be widely used in livestock and poultry breeding fields and improve breeding efficiency. SUMMARY

[0005] In order to overcome the problems of single growth-promoting effect and poor safety of existing compound feed additives, the present application provides a compound feed additive and a preparation method thereof.

[0006] In a first aspect, the present application provides a compound feed additive, which adopts the following technical solution:

[0007] The compound feed additive comprises the following components by weight: saw leaf palm extract 1-8 parts, white birch mushroom extract 1-5 parts, Rhizoma Anemarrhenae extract 0.5-2.5 parts, raspberry extract 20-30 parts, Pittosporum tobira bark extract 3-5 parts, compound bacteria 3-5 parts, and carrier 10-30 parts.

[0008] The present application adopts various plant extracts, composite bacteria and carriers to prepare a composite feed additive. The composite feed additive can improve the intestinal microecological balance of animals, enhance the immune and disease resistance functions and the digestive and absorptive functions of animals, and thus promote the healthy and rapid growth of animals. Specifically, the saw palmetto extract contains fatty acids and sterols and other components, which can regulate the hormone balance in animals, increase the feed intake and feed digestibility of animals, and also has certain antibacterial and anti-inflammatory properties, which can prevent or treat certain inflammatory diseases or infections of animals. The white birch mushroom extract is rich in polysaccharides, polyphenols and other active substances, has strong antioxidant capacity, can scavenge free radicals in the animal body, reduce the damage of oxidative stress to the animal body, enhance immunity, improve disease resistance, and thus improve the growth performance of animals. The Rhizoma Dioscoreae Nipponicae extract contains dioscin, polysaccharides, flavonoids, amino acids and other components, which can stimulate the secretion of digestive enzymes in the intestinal tract of animals, improve the digestive efficiency, and also promote the healthy and rapid growth and development of animals through anti-inflammatory, antioxidant, immune regulation and intestinal regulation. The raspberry extract contains polyphenols, flavonoids, polysaccharides, vitamins and minerals and other active ingredients, which can regulate the activity of digestive enzymes in the intestinal tract of animals, enhance the decomposition efficiency of protein and carbohydrates in feed, and thus improve the growth rate and feed conversion rate; in addition, the raspberry extract also has the effects of enhancing the immunity and antioxidant capacity of animals and optimizing the intestinal health. The Pittosporum acerifolium extract has anti-inflammatory and antibacterial effects, can reduce inflammatory reactions, has obvious inhibitory effect on Staphylococcus aureus, Escherichia coli and Salmonella, can regulate the balance of intestinal flora of animals, maintain intestinal health, improve the appetite and digestive efficiency of animals; in addition, the P. acerifolium extract can also improve the feed conversion rate of animals and the meat quality of livestock and poultry. The composite bacteria can regulate the balance of intestinal flora of animals, inhibit the growth of harmful bacteria, promote the reproduction of beneficial bacteria, improve the intestinal microecological environment, enhance the intestinal barrier function and improve the feed conversion rate. In summary, the composite feed additive provided by the present application can enhance the immunity of animals, improve the balance of intestinal microorganisms of animals, improve the feed conversion rate and other aspects, and thus improve the growth performance of animals and the breeding efficiency of livestock and poultry breeding industry.

[0009] Optionally, the composite feed additive comprises the following components in parts by weight: 3-5 parts of saw palmetto extract, 2-4 parts of white birch mushroom extract, 1-2 parts of Rhizoma Dioscoreae Nipponicae extract, 20-30 parts of raspberry extract, 3-5 parts of P. acerifolium extract, 3-5 parts of composite bacteria and 10-30 parts of carrier.

[0010] In some embodiments, the saw palmetto extract can be in parts by weight of 1-3 parts, 1-5 parts, 3-5 parts, 30-80 parts or 5-8 parts.

[0011] In a specific embodiment, the saw palmetto extract can also be in parts by weight of 1 part, 3 parts, 5 parts or 8 parts.

[0012] In some embodiments, the weight part of the Inonotus obliquus extract can be 1-2 parts, 1-3 parts, 1-4 parts, 2-3 parts, 2-4 parts, 2-5 parts, 3-4 parts, 3-5 parts, or 4-5 parts.

[0013] In a specific embodiment, the weight part of the Inonotus obliquus extract can also be 1 part, 2 parts, 3 parts, 4 parts, or 5 parts.

[0014] In some embodiments, the weight part of the Rhizoma Anemarrhenae extract can be 0.5-1 part, 0.5-1.5 parts, 0.5-2 parts, 1-1.5 parts, 1-2 parts, 1-2.5 parts, 1.5-2 parts, 1.5-2.5 parts, or 2-2.5 parts.

[0015] In a specific embodiment, the weight part of the Rhizoma Anemarrhenae extract can also be 0.5 part, 1 part, 1.5 part, 2 part, or 2.5 part.

[0016] In some embodiments, the weight part of the Rubus chingii Hu extract can be 20-25 parts or 25-30 parts.

[0017] In a specific embodiment, the weight part of the Rubus chingii Hu extract can also be 20 parts, 25 parts, or 30 parts.

[0018] In some embodiments, the weight part of the Pittospori Cortex extract can be 3-4 parts or 4-5 parts.

[0019] In a specific embodiment, the weight part of the Pittospori Cortex extract can also be 3 parts, 4 parts, or 5 parts.

[0020] Alternatively, the complex bacteria are selected from Enterococcus faecium, Bacillus laterosporus, Acetobacter orleanensis, Lactobacillus acidophilus, and Lactobacillus rhamnosus.

[0021] Alternatively, the complex bacteria are a mixture of Enterococcus faecium, Acetobacter orleanensis, and Lactobacillus acidophilus.

[0022] In this application, different types of bacteria powder are mixed to obtain a complex feed additive, and there are significant differences in the improvement effect of animal growth performance and feed conversion rate. Through a series of tests, it is found that the mixture of Enterococcus faecium, Acetobacter orleanensis, and Lactobacillus acidophilus is further selected as the complex bacteria, and the obtained complex feed additive has good activity stability, better growth promotion and feed conversion effect on animals, and has good economic benefits and use prospects.

[0023] Alternatively, the weight ratio of the Enterococcus faecium, Acetobacter orleanensis, and Lactobacillus acidophilus is 1:(0.25-0.5):(1-2).

[0024] In some embodiments, the weight ratio of Enterococcus faecium, Oenococcus orleans, and Lactobacillus acidophilus can be 1:(0.25-0.4):1.5, 1:(0.4-0.5):1.5, 1:0.4:(1-1.5), or 1:0.4:(1.5-2).

[0025] In a specific embodiment, the weight ratio of Enterococcus faecium, Oenococcus orleans, and Lactobacillus acidophilus can also be 1:1:1, 1:0.25:1.5, 1:0.4:1.5, 1:0.5:1.5, 1:0.4:1, or 1:0.4:2.

[0026] Optionally, the carrier is selected from one or more of soybean powder, corn powder, malt root, defatted rice bran, wheat bran, and starch.

[0027] In a second aspect, the present application provides a preparation method of a compound feed additive, comprising the following steps:

[0028] First, mix the plant extracts and the compound bacteria, then add the carrier, and stir and mix at a speed of 300-500 rpm for 20-30 min to obtain a premix; then adjust the water content of the premix to 12±2% by adding water, and use a granulator to granulate, dry, and obtain a compound feed additive with a particle size of 3-5 mm.

[0029] In a third aspect, the present application provides an animal feed comprising a compound feed additive.

[0030] Optionally, the addition amount of the compound feed additive in the animal feed is 20-30 g / kg.

[0031] In the present application, the addition amount of the compound feed additive in the animal feed will affect the growth performance and feed conversion rate of the animal. Through experiments, it is found that when the addition amount of the compound feed additive in the animal feed is controlled within the above range, the animal feed obtained has a better growth-promoting effect on broilers, and the feed conversion rate of the broilers is higher.

[0032] In some embodiments, the addition amount of the compound feed additive in the animal feed is 20-25 g / kg or 25-30 g / kg.

[0033] In a specific embodiment, the addition amount of the compound feed additive in the animal feed can also be 20 g / kg, 25 g / kg, or 30 g / kg.

[0034] In summary, the present application has the following beneficial effects:

[0035] 1. The application adopts saw palm extract, white birch mushroom extract, Shenshanlong extract, raspberry extract and pittosporum extract as plant extracts, and mixes them with complex bacteria, carriers according to a specific ratio to prepare a complex feed additive, which can improve the intestinal microecological balance and appetite of broilers, provide sufficient nutrients for broilers, improve the growth performance and feed conversion rate of broilers, increase the breeding benefit of the farm, and has good economic value and application prospect.

[0036] 2. The application further controls the weight parts of each plant extract in the following range: saw palm extract 3-5 parts, white birch mushroom extract 2-4 parts, Shenshanlong extract 1-2 parts, raspberry extract 20-30 parts, and pittosporum extract 3-5 parts. The prepared complex feed additive has better growth promoting effect on broilers, and the feed conversion rate effect of broilers is better.

[0037] 3. The application further adopts Enterococcus faecium, O. orla-brinensis and Lactobacillus acidophilus in a weight ratio of 1: (0.25-0.5): (1-2) as complex bacteria, and the obtained complex feed additive has better use effect, the feed conversion rate effect of broilers is higher, and the feed to meat ratio of broilers can be as low as 1.40 or less. DETAILED DESCRIPTION

[0038] The application provides a kind of complex feed additive, including the following weight parts of components: saw palm extract 1-8 parts, white birch mushroom extract 1-5 parts, Shenshanlong extract 0.5-2.5 parts, raspberry extract 20-30 parts, pittosporum extract 3-5 parts, complex bacteria 3-5 parts and carrier 10-30 parts;Further, the complex feed additive includes the following weight parts of components: saw palm extract 3-5 parts, white birch mushroom extract 2-4 parts, Shenshanlong extract 1-2 parts, raspberry extract 20-30 parts, pittosporum extract 3-5 parts, complex bacteria 3-5 parts and carrier 10-30 parts.

[0039] Among them, the complex bacteria are selected from Enterococcus faecium, B. laterosporus, O. orla-brinensis, Lactobacillus acidophilus and Lactobacillus rhamnosus, and the carrier is selected from one or more of soybean meal, corn meal, malt root, defatted rice bran, wheat bran and starch. Further, the complex bacteria are a mixture of Enterococcus faecium, O. orla-brinensis and Lactobacillus acidophilus. Still further, the weight ratio of Enterococcus faecium, O. orla-brinensis and Lactobacillus acidophilus is 1: (0.25-0.5): (1-2).

[0040] The preparation method of the above-mentioned complex feed additive includes the following steps:

[0041] First, mix each plant extract and composite bacteria, then add the carrier, and stir and mix at a speed of 300-500 rpm for 20-30 min to obtain a premix; then adjust the water content of the premix to 12±2% by adding water, and use a granulator to granulate, dry, and obtain a composite feed additive with a particle size of 3-5 mm.

[0042] The application also provides an animal feed containing the composite feed additive, and the addition amount of the composite feed additive in the animal feed is 20-30 g / kg.

[0043] In the application, the saw palm extract and the white birch fungus extract are purchased from Sichuan Huanxi Biological Technology Co., Ltd.; the tuber fleeceflower root extract, the raspberry extract, and the sea-tortoise skin extract are purchased from Shaanxi Xintianyu Biological Technology Co., Ltd.; the Enterococcus faecium is a freeze-dried powder with a viable bacterial count of 1.24×10 11 cfu / g, purchased from Shandong Pingju Biological Technology Co., Ltd.; the Bacillus laterosporus is a freeze-dried powder with a viable bacterial count of 100 billion cfu / g, purchased from Shandong Nuojie Biological Technology Co., Ltd.; the Acetobacter orleanensis, also known as Acetobacter aceti subsp. orleanensis, is a freeze-dried powder, purchased from Shanghai Guyan Industry Co., Ltd.; the Lactobacillus acidophilus is a freeze-dried powder with a viable bacterial count of 1.24×10 11 cfu / g, purchased from Hubei Haijia Biological Technology Co., Ltd.; the Lactobacillus rhamnosus is a freeze-dried powder with a viable bacterial count of 100 billion cfu / g, purchased from Shandong Pin Gao Pharmaceutical Co., Ltd.; the rest of the raw materials, reagents, solvents, etc. used in the application can be obtained by commercial purchase.

[0044] The application will be further described in detail below in combination with preparation examples, examples, and performance detection tests.

[0045] Preparation Examples 1-16

[0046] Preparation Examples 1-16 each provide a composite feed additive.

[0047] The differences between the above preparation examples are the addition amounts of the plant extracts in the composite feed additives, which are shown in Table 1 below.

[0048] The preparation method of the composite feed additive provided by Preparation Examples 1-16 includes the following steps: first, weigh each plant extract according to Table 1, mix each plant extract and 40 g of composite bacteria (Enterococcus faecium, Acetobacter orleanensis, and Lactobacillus acidophilus at a weight ratio of 1:1:1), then add 200 g of corn starch, and stir and mix at a speed of 400 rpm for 30 min to obtain a premix; then adjust the water content of the premix to 12±2% by adding water, and use a granulator to granulate, dry, and obtain a composite feed additive with a particle size of 4 mm.

[0049] Table 1 Amount of each plant extract added in the compound feed additive provided by Preparation Examples 1-16

[0050]

[0051] Preparation Examples 17-23

[0052] Preparation Examples 17-23 each provide a compound feed additive.

[0053] The above preparation examples differ from Preparation Example 3 in the types and proportions of the complex bacteria in the compound feed additive, as shown in Table 2 below.

[0054] Table 2 Types and proportions of complex bacteria in the compound feed additive of Preparation Example 3 and Preparation Examples 17-23

[0055]

[0056] Comparative Preparation Example 1

[0057] Comparative Preparation Example 1 provides a compound feed additive.

[0058] The above comparative preparation example differs from Preparation Example 3 in that the amount of saw palmetto extract added is 0. The amounts of other extracts added are: white birch mushroom extract 40 g, Chinese yam extract 25 g, raspberry extract 270 g, and pittosporum bark extract 50 g.

[0059] Comparative Preparation Example 2

[0060] Comparative Preparation Example 2 provides a compound feed additive.

[0061] The above comparative preparation example differs from Preparation Example 3 in that the amount of white birch mushroom extract added is 0. The amounts of other extracts added are: saw palmetto extract 55 g, Chinese yam extract 20 g, raspberry extract 265 g, and pittosporum bark extract 45 g.

[0062] Comparative Preparation Example 3

[0063] Comparative Preparation Example 3 provides a compound feed additive.

[0064] The above comparative preparation example differs from Preparation Example 3 in that the amount of Chinese yam extract added is 0. The amounts of other extracts added are: saw palmetto extract 55 g, white birch mushroom extract 30 g, raspberry extract 255 g, and pittosporum bark extract 45 g.

[0065] Comparative Preparation Example 4

[0066] Comparative Preparation Example 4 provides a compound feed additive.

[0067] The above comparative preparation example is different from preparation example 3 in that the added amount of raspberry extract is 100 g. The added amounts of other extracts are: saw palmetto extract 100 g, white birch mushroom extract 65 g, Chinese yam extract 35 g, and Pittosporium remontonum extract 80 g.

[0068] Comparative preparation example 5

[0069] Comparative preparation example 5 provides a compound feed additive.

[0070] The above comparative preparation example is different from preparation example 3 in that the added amount of Pittosporium remontonum extract is 0. The added amounts of other extracts are: saw palmetto extract 60 g, white birch mushroom extract 40 g, Chinese yam extract 20 g, and raspberry extract 265 g.

[0071] Examples 1-23

[0072] Examples 1-23 respectively provide an animal feed.

[0073] The above examples are different in that the compound feed additives are respectively derived from preparation examples 1-23.

[0074] The preparation method of the animal feed provided by examples 1-23 comprises the following steps: adding the compound feed additive into commercially available feed (purchased from Shandong Jigu Biological Technology Co., Ltd.) at an added amount of 25 g / kg, and uniformly mixing to obtain an animal feed containing the compound feed additive. Example 24

[0075] Example 24 provides an animal feed.

[0076] The above example is different from example 3 in that the added amount of the compound feed additive in the feed is 20 g / kg. Example 25

[0077] Example 25 provides an animal feed.

[0078] The above example is different from example 3 in that the added amount of the compound feed additive in the feed is 30 g / kg.

[0079] Comparative examples 1-5

[0080] Comparative examples 1-5 respectively provide an animal feed.

[0081] The above examples are different from example 3 in that the compound feed additives are respectively derived from comparative preparation examples 1-5. Comparative example 6

[0082] Comparative example 6 provides an animal feed.

[0083] The above comparative example differs from Example 3 in that the amount of the compound feed additive added to the feed is 10 g / kg. Comparative Example 7

[0084] Comparative Example 7 provides an animal feed.

[0085] The above comparative example differs from Example 3 in that the amount of the compound feed additive added to the feed is 40 g / kg.

[0086] Broiler feeding test

[0087] The animal feeds provided by Examples 1-25 and Comparative Examples 1-7 were used for broiler feeding tests. The test method is as follows:

[0088] (1) 330 one-day-old AA + white-feather broilers were selected, half male and half female, and randomly divided into 33 groups, 10 in each group (half male and half female); the test period was 42 days.

[0089] (2) Among them, 25 groups were fed with the animal feeds provided by Examples 1-25; 7 groups were fed with the animal feeds provided by Comparative Examples 1-7; 1 group was fed with a commercially available feed (purchased from Shandong Jigu Biological Technology Co., Ltd.), as a blank control group. During the test period, all conditions were basically the same, and the routine procedures were followed for immunization and deworming, twice a day for feeding, free feeding and drinking water, and once a day for cleaning up the feces and washing the water tank.

[0090] (3) Before the experiment, the fasting body weight of the broilers was weighed; after the experiment, the fasting body weight of the broilers was weighed, and the average daily weight gain of each broiler was calculated; after the experiment, the feed consumption of each group of broilers within 42 days was recorded, and the average daily feed intake of each broiler was calculated; the feed conversion ratio of the broilers was comprehensively calculated, and the results are shown in Table 3 below.

[0091] Average daily weight gain of each broiler = (average body weight of each group of broilers at the end of the test - average initial body weight of each group of broilers) / 420

[0092] Average daily feed intake of each broiler = feed consumption of each group of broilers within 42 days / 420

[0093] Feed conversion ratio = average daily feed intake of each broiler / average daily weight gain of each broiler.

[0094] Table 3 Detection results of broiler feeding test

[0095]

[0096]

[0097] According to the detection results in Table 3, the animal feed obtained from Examples 1-25, Comparative Examples 1-7 and commercially available animal feed were used for 42d broiler feeding; the average daily feed intake of the broilers fed with Examples 1-25 was 97.2-105.3g / bird, the average daily weight gain was 65.1-76.8g / bird, and the feed conversion ratio was 1.36-1.50; while the average daily feed intake of the broilers fed with Comparative Examples 1-7 and commercially available animal feed was 80.4-109.3g / bird, the average daily weight gain was 38.2-60.7g / bird, and the feed conversion ratio was as high as 1.72-2.10. Obviously, the average daily weight gain of the broilers fed with Examples 1-25 was significantly higher than that of the broilers fed with Comparative Examples 1-7 and commercially available animal feed, and the feed conversion ratio of the broilers fed with Examples 1-25 was significantly lower than that of the broilers fed with Comparative Examples 1-7 and commercially available animal feed. Therefore, it is proved that the composite feed additive provided by the present application can improve the intestinal microecological balance of animals and the appetite of broilers, and provide sufficient nutrients for broilers, thereby improving the growth performance and feed conversion rate of broilers, increasing the breeding efficiency of farms, and having good economic value and application prospect.

[0098] According to the detection results of Examples 1-16 and Comparative Examples 1-5, the average daily feed intake of the broilers fed with the animal feed obtained from Examples 1-16 was 97.2-105.3g / bird, the average daily weight gain was 65.1-72.8g / bird, and the feed conversion ratio was 1.41-1.49; while the average daily feed intake of the broilers fed with the animal feed obtained from Comparative Examples 1-5 was 92.7-97.3g / bird, the average daily weight gain was only 50.4-56.2g / bird, and the feed conversion ratio was as high as 1.72-1.86. Therefore, it is proved that the composite feed additive prepared by using saw palmetto extract, white birch mushroom extract, rhizoma anemarrhenae extract, raspberry extract and pittosporum bark extract as plant extracts and controlling the amount of each component within a specific range has a good promoting effect on the growth of broilers; further comparison shows that the feed conversion ratio of the broilers fed with the animal feed obtained from Examples 2-4, Examples 6-7, Examples 10-11 and Examples 13-16 is only 1.41-1.44 (<1.45), which indicates that the composite feed additive prepared by further controlling the weight parts of each plant extract within the following range: saw palmetto extract 3-5 parts, white birch mushroom extract 2-4 parts, rhizoma anemarrhenae extract 1-2 parts, raspberry extract 20-30 parts, and pittosporum bark extract 3-5 parts has a better promoting effect on the growth of broilers, and the feed conversion rate of broilers is better.

[0099] The detection results of Example 3, Examples 17-23 show that, in Example 3, Enterococcus faecium, Oenococcus orleans and Lactobacillus acidophilus are used as the composite bacteria in a weight ratio of 1:1:1, the average daily feed intake of the broilers fed with the animal feed obtained is 103.2 g / bird, the average daily weight gain is 73.1 g / bird, and the feed-meat ratio is 1.41; in Examples 17-21, Enterococcus faecium, Oenococcus orleans and Lactobacillus acidophilus are used as the composite bacteria in a weight ratio of 1:(0.25-0.5):(1-2), the average daily feed intake of the broilers fed with the animal feed obtained is 103.5-104.2 g / bird, the average daily weight gain is 75.4-76.8 g / bird, and the feed-meat ratio is 1.36-1.38 (<1.40); in Examples 22-23, Enterococcus faecium, B. laterosporus and Lactobacillus acidophilus or Enterococcus faecium, Oenococcus orleans and Lactobacillus rhamnosus are used as the composite bacteria in a weight ratio of 1:0.4:1.5, the average daily feed intake of the broilers fed with the animal feed obtained is 102.4-103.1 g / bird, the average daily weight gain is 71.8-72.3 g / bird, and the feed-meat ratio is 1.42-1.44. It is shown that, in the present application, Enterococcus faecium, Oenococcus orleans and Lactobacillus acidophilus are further used as the composite bacteria in a weight ratio of 1:(0.25-0.5):(1-2), and the obtained composite feed additive has a better use effect, and the feed conversion rate of the broilers is higher.

[0100] The detection results of Example 3, Examples 24-25, Comparative Examples 6-7 show that, in Example 3 and Examples 24-25, the addition amount of the composite feed additive in the animal feed is controlled in the range of 20-30 g / kg, the average daily feed intake of the broilers fed with the animal feed obtained is 98.7-105.6 g / bird, the average daily weight gain is 65.6-73.1 g / bird, and the feed-meat ratio is 1.41-1.50; while in Comparative Examples 6-7, the addition amount of the composite feed additive in the animal feed is controlled as 10 g / kg or 40 g / kg, the average daily feed intake of the broilers fed with the animal feed obtained is 89.1-109.3 g / bird, the average daily weight gain is 45.4-60.7 g / bird, and the feed-meat ratio is 1.80-1.96. Therefore, it is shown that, in the present application, the addition amount of the composite feed additive in the animal feed is controlled in the range of 20-30 g / kg, the feed-meat ratio of the broilers fed with the animal feed obtained is low, and the feed conversion rate of the broilers is high.

[0101] In summary, the composite feed additive provided in the present application can improve the growth performance and feed conversion rate of the animals from multiple aspects such as enhancing the immunity of the animals, improving the intestinal microorganism balance of the animals, and improving the feed conversion rate, so that the broilers can fully convert the fed feed into chicken meat, thereby increasing the breeding benefit.

[0102] While the application has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various modifications or changes can be made therein without departing from the spirit and scope thereof. Accordingly, it is intended that all such modifications and changes be included within the scope of the application as claimed.

Claims

1. A compound feed additive, characterized in that, It includes the following components in parts by weight: 1-8 parts saw palmetto extract, 1-5 parts chaga mushroom extract, 0.5-2.5 parts dioscorea nipponica extract, 20-30 parts raspberry extract, 3-5 parts erythrina bark extract, 3-5 parts compound bacteria, and 10-30 parts carrier. The compound bacteria is a mixture of Enterococcus faecalis, Acetobacter orlanus, and Lactobacillus acidophilus; the weight ratio of Enterococcus faecalis, Acetobacter orlanus, and Lactobacillus acidophilus is 1:(0.25-0.5):(1-2).

2. The compound feed additive according to claim 1, characterized in that, The compound feed additive comprises the following components in parts by weight: 3-5 parts saw palmetto extract, 2-4 parts birch polypore extract, 1-2 parts dioscorea nipponica extract, 20-30 parts raspberry extract, 3-5 parts tung oil bark extract, 3-5 parts compound bacteria, and 10-30 parts carrier.

3. The compound feed additive according to claim 1, characterized in that, The carrier is selected from one or more of soybean flour, corn flour, malt root, defatted rice bran, wheat bran, and starch.

4. The method for preparing the compound feed additive according to any one of claims 1-3, characterized in that, Includes the following steps: First, the plant extracts and compound bacteria are mixed, then the carrier is added, and the mixture is stirred at 300-500 rpm for 20-30 minutes to obtain a premix. Then, water is added to adjust the moisture content of the premix to 12±2%, and the mixture is granulated using a pellet mill and dried to obtain a compound feed additive with a particle size of 3-5 mm.

5. An animal feed comprising the compound feed additive according to any one of claims 1-3.

6. The animal feed according to claim 5, characterized in that, The compound feed additive is added to animal feed at a rate of 20-30 g / kg.

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