Effects of γ-Aminobutyric Acid on Growth Performance,Organ Indexes,Serum Biochemical Indicators and Intestinal Morphology of Yellow-Feathered Broiler Chickens under Heat Stress
The present study aimed to explore the effects of γ-aminobutyric acid on growth performance,organ indexes,serum biochemical indicators and intestinal morphology of yellow-feathered broiler chickens under heat stress.A total of 144 thirty-five-day-old male green-footed hemp chickens with similar body weights were randomly divided into 3 groups with 6 replicates in each group and 8 birds in each replicate.The 3 groups were the ordinary temperature control group(CON group),heat stress treatment group(HS group)and heat stress treatment+γ-aminobutyric acid group(GABA group).The CON and HS groups were fed a basal diet,and the GABA group was fed the basal diet supplemented with 100 mg/kg γ-aminobutyric acid.The results showed as follows:1)compared with the CON group,the body weight at 56 days of age,average daily weight gain and average daily feed intake of HS group were significantly decreased(P＜0.01),and the feed to gain ratio was significantly increased(P＜0.05);compared with the HS group,the body weight at 56 days of age,average daily weight gain and average daily feed intake of GABA group were significantly increased(P＜0.05).2)Compared with the CON group,the liver,spleen,breast muscle and thymus indexes of HS group were signifi-cantly decreased(P＜0.05);compared with the HS group,the liver and spleen indexes of GABA group were significantly increased(P＜0.05).3)Compared with the CON group,the rectal temperature on day 3,day 7,day 10 and day 14 of HS group was significantly increased(P＜0.01);compared with the HS group,the rectal temperature on day 7,day 10 and day 14 of GABA group was significantly decreased(P＜0.01).4)Com-pared with the CON group,the contents of triglycerides and potassium in serum of HS group were significantly decreased(P＜0.05),the serum albumin content was significantly decreased(P＜0.01),and the serum sodi-um,cortisol contents and aspartate aminotransferase activity were significantly increased(P＜0.01);compared with the HS group,the serum corticosterone content of GABA group was significantly decreased(P＜0.05),and the serum aspartate aminotransferase activity was significantly decreased(P＜0.01).5)Compared with the CON group,the jejunal villus height of HS group was significantly decreased(P＜0.05);compared with the HS group,the jejunal villus height and villus height/crypt depth of GABA group was significantly increased(P＜0.05).In summary,heat stress treatment leads to the growth performance decrease,organ development damage,body temperature increase and nutrient absorption and utilization capacity reduce of yellow-feathered broiler chickens;dietary γ-aminobutyric acid has the effect of alleviating heat stress and improving growth per-formance of yellow-feathered broiler chickens.[Chinese Journal of Animal Nutrition,2024,36(5):2938-2947]
万方数据
维普
