低温及能量水平对笼养育成蛋鸭生长及性发育的影响

试验研究了低温环境及不同能量水平(10.68,11.36,12.04 MJ·kg-1)的饲粮对笼养育成蛋鸭生长性能及性发育的影响。选用13周龄健康的金定鸭144只,随机分成6组,分别置于(2±1)℃,(18±1)℃的环境中。结果表明:①低温使日采食量和料重比显著升高(P<0.01),而使日增重降低(P>0.05),在低温环境下随着饲粮能量水平的提高,日采食量和料重比有下降的趋势(P<0.05),而日增重有上升的趋势(P<0.05);②低温减缓了卵巢及输卵管的发育,但差异不显著(P>0.05),并且在低温环境下随着饲粮能量水平的提高,卵巢及输卵管的发育情况有上升的趋势;低温使血清钙、总蛋白含量显著降低(P<0.01),使孕酮浓度降低(P>0.05),在低温环境下提高饲粮能量水平使血清钙、总蛋白含量及孕酮浓度有上升的趋势。

Effect of cold stress and different energy levels on growth and sex development in laying ducks in cage

The objective of this study was to determine cold stress and dietary energy levels(10.68,11.36,12.04 MJ·kg-1) on growth performance and sex development in laying ducks in cage.Total 144 13-week-old Jin-ding ducks were randomly divided into 6 groups,which were exposed to environment at(2±1) ℃ and(18±1) ℃.The results showed as follows: ①In cold temperature,feed intake and feed conversion ratio very significantly increased(P<0.01),while daily weight gain decreased(P>0.05).And with the dietary level increased,feed intake and feed conversion ratio were tending downwards(P>0.05),and daily weight was tending upwards(P>0.05).② In cold temperature,the development of ovary and oviduct slowered(P>0.05),with the dietary level increased,the development of ovary and oviduct was tending upwards.Serum total protein and calcium significantly decreased(P<0.01),but progesterone decreased(P>0.05),with the dietary level increased,serum total protein,calcium and progesterone were tending upwards.