杜仲叶提取物对肉鸡生长性能、血清生化指标和小肠形态结构的影响OA

To develop a feed additive derived from plant extracts for meat chickens,this experiment u-tilized Ross 308 broiler chickens(1 day old)as the experimental subjects to investigate the effects of Eu-commia ulmoides leaf extract on growth performance,serum biochemical parameters,and intestinal mor-phology.The study consisted of two groups:a control group(fed basal diet)and a 0.3％Eucommia leaf extract group(basal diet supplemented with 3 g·kg-1 Eucommia leaf extract).The experimental period lasted six weeks.The results showed that 1)the inclusion of 0.3％Eucommia leaf extract in the diet sig-nificantly increased the broilers' body weight at 21 days of age,as well as the villus height in the duode-num,jejunum,and ileum,and the weights of the liver,kidneys,and spleen(P＜0.05).Additionally,it significantly decreased serum levels of total cholesterol and high-density lipoprotein(HDL)cholesterol(P＜0.05).2)At 42 days of age,broilers fed with the 0.3％Eucommia leaf extract diet exhibited a signifi-cant increase in breast muscle yield and leg muscle yield(P＜0.05).Furthermore,supplementation with 0.3％Eucommia leaf extract markedly increased the villus length and the villus height-to-crypt depth ratio across various intestinal segments(P＜0.05),while significantly reducing serum HDL cholesterol levels(P＜0.05).In conclusion,adding 0.3％Eucommia leaf extract to the diet can promote cholesterol metabo-lism in broilers,enhance nutrient digestion and absorption in the small intestine,and improve overall growth performance.