动物营养学报2025，Vol.37Issue(3)：1698-1714,17.DOI:10.12418/CJAN2025.144
不同蛋白质水平饲粮对育成期农大6号商品蛋鸡生长发育和肠道健康的影响
Effects of Diets with Different Protein Levels on Growth and Development and Intestinal Health of Nongda 6 Commercial Laying Hens during Growing Period
摘要
Abstract
The aim of this experiment was to study the effects of dietary crude protein level on growth perform-ance,slaughter performance,intestinal health and reproductive organ development of Nongda 6 commercial laying hens during growing period,and to provides a theoretical basis for the development of feeding standards for Nongda 6 commercial laying hens during growing period.Two hundred and seventy Nongda 6 commercial laying hens in good health condition at 8 weeks of age with similar body weight and size were randomly divided into three groups,groups A,B and C,with six replicates in each group and 15 hens in each replicate,and the diets of them with the protein levels of 17.0%,15.5%and 14.0%,respectively.The experimental period was 9 weeks,and growth performance was measured and slaughtered for sampling at the end of 17 weeks of age.The results showed as follows:1)the average daily feed intake of group C was extremely significantly higher than that of group A(P＜0.01).2)The shank length,shank circumference and breast width of group A were extremely significantly lower than those of the other two groups(P＜0.01),and the body slope length of group B was extremely significantly lower than that of the other two groups(P＜0.01).3)The slaughter rate of group B was significantly higher than that of group C(P＜0.05);the liver index of group A was extremely significantly greater than that of the other two groups(P＜0.01).4)The relative length of jejunum of group A was extremely significantly lower than that of the other two groups(P＜0.01),and the height of jejunal and il-eal villi and the depth of jejunal crypts in group A were significantly lower than those of the other two groups(P＜0.05);the ratio of ileal villi height to crypt depth of group B was significantly higher than that of group A(P＜0.05).5)For cecal microbiota,the Observed_species index of group A was significantly higher than that of the other two groups(P＜0.05),and the Shannon index of group A was significantly higher than that of group B(P＜0.05);group A had the highest relative abundances of Firmicutes and Bacteroides,while group B had the highest relative abundances of Bacteroidota and Barnesiella.6)Group B had the most dense follicle distribution;the length of oviduct of group A was extremely significantly lower than that of the other two groups(P＜0.01);the ovary weight of group B was significantly higher than that of group C(P＜0.05).In conclusion,dietary protein level of 15.5%is more favourable to the growth and development and intestinal health of Nongda 6 commercial laying hens.[Chinese Journal of Animal Nutrition,2025,37(3):1698-1714]关键词
农大 6 号商品蛋鸡/育成期/蛋白质水平/生长发育/肠道健康Key words
Nongda 6 commercial laying hens/growing period/protein level/growth and development/in-testinal health分类
农业科技引用本文复制引用
张梦玲,龚道清,陈万虹,穆继安,李抒航,李硕,樊艳风,刘龙,赵敏孟,耿拓宇..不同蛋白质水平饲粮对育成期农大6号商品蛋鸡生长发育和肠道健康的影响[J].动物营养学报,2025,37(3):1698-1714,17.基金项目
江苏省种业振兴揭榜挂帅项目(JBGS[2021]105) （JBGS[2021]105）
