Application of glycyrrhizic acid in improving hatching performance of broiler breeder hens in late laying period

Abstract

The application discloses application of glycyrrhizic acid in improving hatching performance of broiler breeders in a late egg production period, and belongs to the technical field of livestock and poultry breeding and feed preparation. Experiments prove that feeding 100 mg / kg of the glycyrrhizic acid to broiler breeders in a late egg production period for 5-8 weeks can improve the production performance, hatching performance, egg quality and reproductive hormone level of the broiler breeders in the late egg production period.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of livestock and poultry breeding and feed preparation, and particularly relates to application of glycyrrhizin acid in improving hatching performance of broiler breeders in post-peak laying period. BACKGROUND

[0002] Commercial broiler feeding is the main body of the modern broiler production system, and broiler supply is the key to determine the production of the entire broiler industry chain. In actual production, after the broiler breeders go through the high-frequency egg-laying period of the peak period, they will gradually enter the post-peak laying period. In this stage, the hatching performance of the broiler breeders (in the post-peak laying period) decreases rapidly, mainly manifested as a decrease in egg-laying rate, fertilization rate, hatching rate and offspring chick quality, which seriously affects the economic benefits of enterprises. How to alleviate the decrease in reproductive performance of broiler breeders in the post-peak laying period and improve the number of breed eggs hatched and the hatching rate has become a technical problem that the industry at home and abroad urgently needs to break through. It is considered that the development of new plant extract feed additives is an important measure to promote the adjustment of the feed industry, the development of characteristic plant resources and the promotion of healthy breeding of poultry.

[0003] Glycyrrhizin acid (GA) is an important physiologically active substance in Chinese medicine licorice, which mainly exists in the form of sodium, potassium and calcium salts in nature. Glycyrrhizin acid has a wide range of pharmacological effects, such as anti-inflammatory, antioxidant and liver protection. The present application aims to reveal the function of glycyrrhizin acid in improving the function of reproductive organs of broiler breeders in the post-peak laying period. SUMMARY

[0004] The purpose of the present application is to solve the problems in production, such as the aggravation of oxidative damage in broiler breeders in the post-peak laying period, the weakening of reproductive organ function, the decrease of reproductive hormones and the decrease of reproductive performance, and to provide application of glycyrrhizin acid in improving hatching performance of broiler breeders in the post-peak laying period.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] A feed containing glycyrrhizin acid, wherein 100 mg / kg of glycyrrhizin acid is added to the daily ration on the basis of the daily ration.

[0007] A method for improving hatching performance of broiler breeders in the post-peak laying period, wherein 100 mg / kg of glycyrrhizin acid is fed to the broiler breeders in the post-peak laying period for 5-8 weeks.

[0008] Application of glycyrrhizin acid in improving hatching performance of broiler breeders in the post-peak laying period, wherein the glycyrrhizin acid has the following characteristics in application:

[0009] 1) significantly reducing the abdominal fat index;

[0010] 2) improving feed conversion rate and reducing the rate of abnormal eggs;

[0011] 3) improving the hatching rate of breed eggs and the hatching rate of fertilized eggs;

[0012] 4) Improve the albumen height and shell strength of hatching eggs;

[0013] 5) Increase serum progesterone levels.

[0014] Beneficial effects:

[0015] This invention discloses a feed containing glycyrrhizic acid, a method for improving the hatching performance of broiler breeder hens in the late laying stage, and the application of glycyrrhizic acid in improving the hatching performance of broiler breeder hens in the late laying stage. Through experiments, this invention has demonstrated that feeding broiler breeder hens in the late laying stage with 100 mg / kg of glycyrrhizic acid for 5-8 weeks can improve the production performance, hatching performance, egg quality, and reproductive hormone levels of broiler breeder hens in the late laying stage. Detailed Implementation

[0016] The embodiments of the present invention are described in detail below. These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments.

[0017] Example

[0018] Test treatment

[0019] Table 1 Experimental Groups and Treatments

[0020]

[0021] Test methods

[0022] One hundred and forty-four 50-week-old Lifeng white-feathered broiler breeders with similar body weight and physiological condition were randomly divided into two diet treatment groups, with six replicates per treatment and twelve chickens per replicate. The two treatment groups were further divided into a control group and an experimental group. During the experiment, the chickens were fed and watered as normal broiler breeders, with a one-week pre-feeding period and an eight-week experimental period. At the end of the eighth week, 210 fertilized eggs were randomly collected from each treatment group for incubation. During the experiment, the broiler breeder production performance, egg hatchability, serum reproductive hormone levels, and egg quality were measured.

[0023] Experimental Result 1: Organ Index

[0024] Table 2. Effects of dietary glycyrrhizic acid supplementation on organ index of late-laying breeding hens.

[0025]

[0026] Note: Organ index (g / kg) = organ weight (g) / live body weight (kg). Data in the table are expressed as mean ± standard error (n=6); the graph is labeled... This indicates a significant difference between groups (P < 0.05). The same applies to the following tables.

[0027] As shown in Table 2, compared with the CON group, the addition of 100 mg / kg of glycyrrhizin to the diet had no significant effect on the liver, spleen and ovary indices of breeding hens in the late laying period, but significantly reduced the abdominal fat index (P < 0.05).

[0028] Test Result 2: Production Performance

[0029] Table 3. Effects of dietary glycyrrhizic acid supplementation on the production performance of broiler breeder chickens in the late laying period.

[0030]

[0031] Note: Data in the table are expressed as mean ± standard error (n=6).

[0032] As shown in Table 3, compared with the CON group, the GA group significantly improved the average egg production rate of breeder hens during weeks 5 to 8 of the experimental period (P < 0.05). Throughout the experimental period, GA treatment had no significant effect on the average egg weight and broken egg rate of breeder hens in the late laying period. Compared with the CON group, dietary supplementation with 100 mg / kg glycyrrhizic acid showed a trend of improving feed conversion ratio in broiler breeder hens during weeks 5 to 8 of the late laying period (P = 0.066).

[0033] Experiment Result 3: Hatching Performance

[0034] Table 4. Effects of dietary glycyrrhizic acid supplementation on hatching performance of breeding chickens

[0035]

[0036] Note: Data in the table are expressed as mean ± standard error (n=6).

[0037] As shown in Table 4, compared with the control group, the addition of GA to the diet of breeder chickens can significantly improve the hatching rate of hatching eggs and the hatching rate of fertilized eggs (P < 0.05), but has no significant effect on the fertilization rate of hatching eggs and the healthy chick rate of offspring.

[0038] Experiment Result 4: Egg Quality

[0039] Table 5. Effects of dietary glycyrrhizic acid supplementation on the quality of meat-type eggs in the late laying period.

[0040]

[0041] Note: Data in the table are expressed as mean ± standard error (n=12).

[0042] As shown in Table 5, compared with the CON group, dietary supplementation with glycyrrhizic acid significantly increased the albumen height of hatching eggs at the end of the experiment (P < 0.05). Furthermore, dietary supplementation with glycyrrhizic acid tended to increase eggshell strength (P = 0.079).

[0043] Experiment Result 5: Reproductive Hormone Levels and Biochemical Indicators

[0044] Table 6. Effects of dietary glycyrrhizin supplementation on serum reproductive hormone levels and biochemical indicators in late-laying breeding hens.

[0045]

[0046] Note: Data in the table are expressed as mean ± standard error (n=6).

[0047] As shown in Table 6, compared with the CON group, dietary supplementation with 100 mg / kg glycyrrhizic acid significantly increased serum progesterone levels (P< 0.05), but had no significant effect on serum estrogen levels.

[0048] The above embodiments are merely illustrative of the principles and effects of the invention, as well as some of the application examples. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept, and these all fall within the scope of protection of the invention.

Claims

1. The application of glycyrrhizic acid in improving the hatchability of broiler breeder hens in the late laying period, characterized in that, Adding 100 mg / kg of glycyrrhizic acid to the diet, the glycyrrhizic acid having the following properties: improving the hatching rate of hatching eggs and the hatching rate of fertilized eggs.

Images