摘要
将180只一日龄罗斯Ⅰ号肉用公雏随机分为3组,第5日龄分别给予0、24和48小时的38℃高温处理,第43日龄又将该三种处理再随机分为3组,分别接受持续22℃(Ⅰ)38℃6小时后持续22℃(Ⅱ)和持续30℃(Ⅲ)的温度环境,直至56日龄为止。结果表明,早期高温处理对肉仔鸡生长发育无不良影响,并能提高肥育后期耐热性,使采食量和日增重显著提高,也使急剧高温下的死亡率从55.6％下降到15.8～21.0％。在肥育期的两种高温环境中,升温3小时后,经过早期处理的鸡,体温都比未经处理的低0.4～0.6℃。早期高温处理也使肥育期遭遇高温条件对甲状腺重量显著下降。
A Total of 180 Rose J Cockeral broilers were randomly divided into 3 roups at 1 day of age and exposed to 38℃ environmental temperature at 5 days of age for 0.24 and d8 hrs. At 43 days of age each one of those groups were randomly divided into 3 Sub groups and reared under 22℃(thermoneutrality temperature). 38—22℃(acute heat sress for 6hrs) and 30℃(chronic heat stress)for two weeks. The results showed that there were harmless effects with treatment at 38℃ on broiler's performance and,further, the heat tolerance of broilers at 43 to 56 days of age was significantly increased,and that the feed intake and weight gain were improved and mortality and body temperature rising rate were decreased during acute heat stress. The brid's thyroid weight was more significantly decreased by the early treatment.
出处
《黑龙江畜牧兽医》
CAS
北大核心
1992年第3期5-7,共3页
Heilongjiang Animal Science And veterinary Medicine
关键词
鸡
高温
肉鸡
仔鸡
生长发育
broiler performance heat toiorance temperature thyroid(003)
