Effect Of Yeast Culture On Production Performance, Digestive Physiology And Immunity Of Sichuan White Goose

Yeast culture has the functions of promoting the growth and development of livestock and poultry,regulating intestinal development,and improving meat quality.At present,the research on yeast culture mainly focuses on animals such as pigs,cattle,chickens,ducks and aquatic products.less.However,China is the world’s largest goose raising country,and the number of goose breeding and germplasm resources ranks first in the world.Therefore,this experiment took Sichuan white geese as the research object,to explore the effect of adding different levels of yeast culture in the diet on the production performance,digestive physiology and body immunity of Sichuan white geese,in order to find the most suitable addition amount as yeast culture Provide basic data for applications produced in the goose industry.A single factor test was used to select 300 1-day-old Sichuan white geese with healthy body weight and similar weight(95.57 ± 2.42g),and were randomly divided into 5 groups with 3 repeats in each group.Mother and a half,the test period is 70 days,respectively: 0% group(basic diet,ie control group),0.5% group(basic diet + 0.5% yeast culture),1% group(basic diet + 1% Yeast culture),2% group(basic diet + 2% yeast culture),4% group(basic diet + 4% yeast culture).The test results are as follows:Analysis of the economic benefits of adding yeast culture to diets.Adding yeast culture to the diet of Sichuan White Goose can increase the total income,but when the control group is used as the reference point for the yield(0),it is found that only 0.5% group and 2% group have a yield rate greater than 1,of which 2% The maximum rate of return is 5.6;the two points of intersection between the marginal cost and marginal output curves between the 1%-2.5% addition level,where the intersection point near the 2% group is higher than the point near the 1% group;in the sensitivity coefficient value Among them,only 2% of the groups had a sensitivity coefficient greater than 1,which was 3.43.Effect of dietary yeast culture on the performance of Sichuan White Goose.Yeast culture can significantly increase the average daily weight gain,keel length,alanine aminotransferase,aspartate aminotransferase,and alkaline phosphatase activities of Sichuan white geese(P <0.05);total protein,albumin,globulin,high in 0.5% group The contents of density lipoprotein and low density lipoprotein were significantly higher than those of the other three treatment groups(P <0.05);the chest muscle rate,uric acid,triglyceride,creatine kinase and growth hormone content of the 2% group were significantly higher than those of the other three treatment groups Group(P <0.05),while the feed-weight ratio and abdominal fat rate were significantly lower than the other three treatment groups(P <0.05).The body oblique length and neck length of the 4% group were significantly longer than those of the other three treatment groups(P <0.05).Effects of adding yeast culture in diets on antioxidant enzymes and meat quality of Sichuan White Goose.The effect of yeast culture on the activity or content of antioxidant enzymes in different tissues and parts is inconsistent.In the chest muscle,the content of trace reduced glutathione was highest in the 2% group(P <0.05),and the content of catalase and glutathione reductase was highest in the 1% group(P <0.05),and malondialdehyde The highest content was in the control group(P <0.05);in the liver,the content of trace reduced glutathione was highest in the 1% group,but there was no significant difference between the 2% and 4 groups(P <0.05),hydrogen peroxide The content of enzyme was highest in 2% group(P <0.05),glutathione reductase was highest in 4% group(P <0.05),and malondialdehyde was highest in control group(P <0.05);in serum,The content of trace reduced glutathione was not significantly different among the groups(P <0.05),the content of catalase and glutathione reductase was the highest in the 2% group(P <0.05),and the content of malondialdehyde was the control group The highest(P <0.05).Adding yeast culture to the diet can significantly reduce the cooking loss rate,drip loss rate and shear force(P <0.05),and significantly increase the hue value(P <0.05);the crude fat content and color value of the 2% group were significantly higher The other three treatment groups(P <0.05),while the muscle fiber area and diameter were significantly lower than the other three treatment groups(P <0.05).Effects of adding yeast culture in diets on digestive physiology of Sichuan White Goose.Yeast yeast culture can significantly increase the utilization of CP,trypsin activity in the pancreas(P <0.05),significantly reduce the liver index and muscular stomach index(P <0.05);pancreas index,glandular stomach index,jejunum weight in the 2% group,Pepsin activity,lipase in duodenum,amylase activity,villi height in jejunum and duodenum,and mucosal thickness were significantly higher than those in the other three treatment groups(P <0.05).The length of duodenum,jejunum and ileum in the 4% group was significantly longer than that in the other treatment groups(P <0.05),and the height of villi and mucosal thickness in the ileum were significantly higher than those in the other three treatment groups(P <0.05).Effect of dietary yeast culture on the immunity of Sichuan white geese.Compared with the control group,the spleen index and IgG content of the 0.5% group were significantly reduced(P <0.05),and the contents of C4,IL-2 and lysozyme were significantly increased(P <0.05);the IgM,C3 and lysozyme of the 1% group The content of enzymes increased significantly(P <0.05);the content of the bursa index,IgM,C4,IL-2 and lysozyme in the 2% group increased significantly(P <0.05);the thymus index in the 4% group decreased significantly(P <0.05),C3 content increased significantly(P <0.05).In conclusion:Adding 0.5%,1% and 2% levels of yeast culture to the diet can increase the yield of goose raising.The 2% addition level is the sensitive coefficient of the profit of goose raising and the marginal benefit point of production.Yeast culture can improve the growth performance,antioxidant capacity,immunity and utilization of nutrients of Sichuan White Goose,improve serum biochemical indicators,meat quality tenderness,and promote the growth of digestive organs and intestinal development.Among them,the average daily weight gain,serum growth hormone content,pectoral muscle rate,digestive enzyme activity,IgM,C3,C4,IL-2 and lysozyme content were highest at the 2% addition level,and the feed-weight ratio and abdominal fat rate were the lowest.Therefore,under this test condition,the recommended dosage of yeast culture in Sichuan White Goose diet is 2%.