饲粮蛋氨酸水平对1-42日龄盐津乌骨鸡生长发育的影响

Effect of dietary methionine level on growth and development of Yanjin silky fowl chickens aged 1 to 42 days

试验旨在研究饲粮蛋氨酸水平对1~42日龄盐津乌骨鸡生长发育的影响。试验选取体重相近的健康1日龄盐津乌骨鸡200只,随机分为5组,每组5个重复,每个重复8只鸡,公、母各半。各组分别饲喂蛋氨酸水平为0.32%、0.41%、0.50%、0.59%、0.68%的试验饲粮,试验期42 d。结果显示:7~28日龄时各组雏鸡的体重具有明显差异,0.41%和0.50%组雏鸡的体重较高,0.41%组第6周的增重显著高于0.50%组和0.59%组(P<0.05)。饲粮蛋氨酸水平明显影响雏鸡7日龄时的体斜长、胸宽、胸深、龙骨长、胫围和盆骨宽,以及42日龄时的体斜长、胸宽、胸深、14~42日龄时胫长;42日龄时,0.41%组胸宽显著高于0.32%组(P<0.05),胫长显著高于0.32%组、0.59%组和0.68%组(P<0.05)。42日龄时,各组雏鸡的回肠、直肠、肠总长度和回肠、肌胃、心脏、肝、脾指数具有明显差异,0.41%组的直肠长度显著高其他组(P<0.05)。饲粮蛋氨酸水平明显影响28日龄和35日龄的副翼羽长度,7、21、35日龄时的主翼羽数量。研究表明,饲粮蛋氨酸水平为0.41%时,1~42 d盐津乌骨鸡生长发育较好。

The experiment aimed to investigate the effect of dietary methionine levels on the growth and development of Yanjin silky fowl chickens aged 1 to 42 days.A total of 200 one-day-old healthy Yanjin silky fowl chickens with similar body weights were randomly divided into five groups,with five replicates per group and eight chickens per replicate,including both males and females.Each group was fed experimental diets with methionine levels of 0.32%,0.41%,0.50%,0.59%,and 0.68%.The trial period was 42 days.The results showed that there were significant differences in the body weight of chicks from 7 to 28 days old among the groups,with the 0.41%and 0.50%groups had higher body weights,and the weight gain in the 0.41%group was significantly higher than that of the 0.50%and 0.59%groups in the sixth week(P<0.05).The dietary methionine levels significantly affected the body slanting length,breast width,breast depth,keel length,tibial circumference,and pelvic width of chicks at 7 days old,as well as the body slanting length,breast width,breast depth at 42 days old,and tibial length from 14 to 42 days old.At 42 days old,the breast width of the 0.41%group was significantly higher than that of the 0.32%group(P<0.05),and the tibial length was significantly higher than that of the 0.32%,0.59%,and 0.68%groups(P<0.05).At 42 days old,the lengths of the ileum,rectum,and total intestine,as well as the indices of the ileocecal,muscular gastrulae,cardiac,hepatic,and splenic of the chicks,showed significant differences among the groups.The length of rectum was significantly higher in the 0.41%group than that of the other groups(P<0.05).The dietary methionine levels significantly affected the length of the parafoil feathers at 28 and 35 days old,and the number of primary wing feathers at 7,21,and 35 days old.The study indicates that when the dietary methionine level is 0.41%,the growth and development of Yanjin silky fowl chickens from 1 to 42 days old is better.