摘要
选20周龄感染鸡传染性鼻炎、25周龄康复的罗曼产蛋鸡450只 ,随机等分5组 ,在相同基础日粮中添加0(对照)、0.2、0.4、0.6及0.8mg/kg铬量的酵母铬 ,经2周高温期预试、5周高温期及3周舒适期正试。结果表明 :(1)与舒适期相比 ,酵母铬显著提高热应激期产蛋率(P<0.01);补铬有降低试验期蛋重的趋势(P>0.05)。(2)热应激期高浓度酵母铬显著提高血清T4、胰岛素和肌酸激酶水平(P<0.01或P<0.05) ;降低了血糖水平(P<0.05)。低浓度酵母铬可提高试验期蛋鸡血清碱性磷酸酶含量(P<0.05) 。
Lohmann brown layers infected with Avian Rhinotracheitis at 20 week of age and recovering at 25 week of age were randomly divided into five groups,one was fed with the basal diet,as the control;other four groups were fed with the basal diet added with 0.2, 0.4,0.6 or 0.8mg/kg chromium yeast(CrY) respectively.After 2 weeks under high temperature as pretrial.The trail experienced 5 week under high temperature and following 3 week thermoneutrality period as formal trail.The experimental results were as follows:(1)The laying rates of hens were significantly (P<0.01)improved with the different concentrations of CrY supplemented in diets during heat stress phase,but egg weights of all treatments showed a decreasing trend (P>0.05)compared with that of the control in whole trail period.(2)The contents of thyroxine(T4),insulin and creatine phosphokinase in serum were significantly increased in heat stress phase(P<0.01 or P<0.05) due to the supplementation of high level of CrY in diet,meanwhile,the contents of glucose were reduced(P<0.05).The content of alkaline phosphatase in serum at low level of CrY were increased by the end of the trail(P<0.05).The contents of protein and cholesterol in serum were influenced by the heat stress and physiological conditions of the layers or by the level of CrY in diet.
出处
《动物营养学报》
CAS
CSCD
2002年第4期32-37,共6页
CHINESE JOURNAL OF ANIMAL NUTRITION
关键词
酵母铬
应激状态
蛋鸡
产蛋性能
血清化指标
chromium yeast
stress
laying performance
biochemical parameters
