高温对蛋鸡生产性能和血浆皮质酮、甲状腺素、孕酮水平的影响

EFFECT OF HIGH AMBIENT TEMPERATURE ON PRODUCTIVITY AND PLASMA CORTICOSTERONE, THYROID HORMONE, PROGESTERONE LEVEL IN LAYING HENS

本文研究了高温对蛋鸡生产性能和血浆皮质酮、甲状腺素、孕酮水平的影响。结果表明：３０℃高温持续２６，鸡产蛋率、蛋重均未见变化，但耗料量和料蛋比下降显著（Ｐ＜０．０５），再次升温至３５℃持续６ｄ，产蛋率、蛋重、耗料量及料蛋比极显著下降（Ｐ＜０．０１）。随着温度的升高，血浆皮质阈和Ｔ＿３水平先下降后恢复或回升；血浆Ｔ＿４和孕酮水平先上升后恢复或稍有下降。

The article was to determine the effect of high alnbient temperature on productivi-ty and plasma corticosterone,thyroid hormone, progesterone level in laying hens.Theresult showed;neither laying rate nor egg weight of test group had a reduction duringtwo days when ambient temperature(Ta)was 30℃ while feed intake and feed conver-sion ratio declined(P<0 05);after Ta was raised to 35℃ laying rate,egg weight,feed intake and feed conversion ratio were very significantly lower than those of controlgroup(P<0.01).As Ta rose,plasma corticosterone and Ts level first declined andthen restored or increased;plasma T4 and progesterone level first increased and thenrestored or declined。