肉鸡饮服“必补-18”的抗应激效果研究(Ⅱ)

本文研究了“必补＿１８”对应激条件下肉鸡的影响。结果表明：“必补＿１８”显著改善了０～３周龄肉鸡的增重、饲料转化率，显著提高了血清γ＿球蛋白水平和成活率，采食量未见有显著改变。５～８周龄肉鸡经历高温３２℃一周，其增重、饲料转化率和采食量均显著下降（Ｐ＜０．０１），饮服“必补＿１８”显著提高了增重和饲料转化率（Ｐ＜０．０１），采食量未见有差异，高温一周过程中，３２℃１６小时血浆皮质酮，Ｔ３先显著下降（Ｐ＜０．０１）、Ｔ４显著升高（Ｐ＜０．０１），３２℃１２０小时时，血浆皮质酮、Ｔ３回升且显著高于常温组（Ｐ＜０．０５），Ｔ４较１６小时显著下降（Ｐ＜０．０１）但仍高于常温组（Ｐ＜０．０５）。在高温条件下饮服“必补＿１８”血浆皮质酮、Ｔ３和Ｔ４呈现与高温对照组同样规律的变化，但这种变化得到显著缓解（Ｐ＜０．０５）

EFFECT OF “BIBU_18” IN BROILERS ON CONDITION OF STRESSES

This study was conducted to the effect of “Bibu_18”(3g was added into per kilograme drinking water)on bililers in condition of stresses.The following results were obtained:(1)To 0～3 week_old broiler,“Bibu_18”had improved their weight gain and feed conversion ratio,increased their level of serum r_agglutinin and their ratio of survival,but not changed their feed intake.(2) When 5～8week_old broiler kept in high_temperature environment(32℃)for 7 days,their weight gain,feed conversion ratio and feed intake were decreased significantly(P<0.01).While drinking water with“Bibu_18”,their weight gain and feed conversion ratio were increased markedly(P<0.01)but feed intake not changed.(3) During high temperature (32℃,7 days),at 16th hour the levels of plasma corticosterone and T 3 of high temperature control(HNC) group were significantly lower than those of thermoneutral control (TNC) group(P<0.01),but T 4 was higher(P<0.01);at 120th hour the levels of plasma corticosterone and T 3 of HTC group raised and were higher markedly than those of TNC group (P<0.05),T 4 declined (P<0.01) but yet higher than that of TNC group (P<0.05).Those changes of plasma corticosterone,T 3 and T 4 concentration at 16th and 120th hour of “Bibu_18”treatment group appeared the same rule as that of HTC group compared with TNC group.But “Bibu_18”treatment moderated notably those changes induced by high temperature.