摘要
本文研究了持续高温对甲状腺素及生产性能的影响规律，结果表明：未经历过热应激的２１０日龄北京红鸡在经连续的２７～３４℃／ｄ的高温处理后，Ｔ４，Ｔ３水平先升后降。Ｔ４／Ｔ３转化率比例逐渐升高。伴随着甲状腺素的变化，蛋鸡生产性能前４ｄ大幅度下降，而后又逐渐恢复到接近应激前的水平。北京红鸡在以上方面对热应激的习惯化过程为７ｄ。其变化规律可视为选择调控热应激添加剂的理论依据。
he article was conducted to study the regular pattern of plasma thyroid and
pro-ductivity in sustained high ambient tempreature. Result indicated:After Beijing Red
layinghens at 210 days old which never experence heat stress were treated by 27～34℃
cyclic everydav in successsion. The level of T4,T3 and T4/T3 first increated then declined(P<0.
01)in 3～4 dnys, after 7 days they steadied at a new level or approach the level of before heat
stress.With the changes of the laying hens productivity declined greatly in first 3～4 days(P<0.
01)and then restored to approach the level of before heat stress.The adaption course of Bei-jing
Red laying hens is about 7 days.This change psttern will provide a theoretical basis for
se-lection anti-heat stress additive.
出处
《北京农学院学报》
1996年第2期63-67,共5页
Journal of Beijing University of Agriculture
基金
北京自然基金
