本试验旨在研究不同蛋白质水平饲粮对雌性蓝狐繁殖性能的影响.选择健康、平均体重为(6.23±0.67)kg的雌性初产蓝狐180只,随机分成4组(每组45个重复,每个重复1只蓝狐),分别饲喂蛋白质水平为36％(Ⅰ组)、32％(Ⅱ组)、28％(Ⅲ组)、24％(Ⅳ组)的试验饲粮,试验期为2010-02-13-2010-06-05.结果表明,Ⅰ、Ⅱ组蓝狐的发情开始时间早于Ⅲ、Ⅳ组,各组蓝狐的受胎率均呈现出正态分布.Ⅱ组蓝狐的受配率最高,并显著高于Ⅲ组(P＜0.05).不同蛋白质水平饲粮对蓝狐的窝产仔数没有显著影响(P＞0.05),但Ⅰ、Ⅱ组仔狐的初生个体重显著高于Ⅳ组(P＜0.05).随着饲粮蛋白质水平的降低,蓝狐的受胎率、仔狐的初生窝重均呈现先增大后减小的趋势,仔狐的初生成活率呈现降低的趋势,但是都未达到显著水平(P＞0.05).由此得出,雌性蓝狐繁殖期饲粮适宜蛋白质水平为33.14％.%The objective of this study was to determine the different dietary protein levels on reproductive performance of female blue foxes (Alopex lagopus). A total of 180 healthy and primiparous female blue foxes with average body weight of (6. 23 ±0. 67) kg were randomly assigned to 4 groups with 45 replicates per group and 1 fox per replicate. Foxes in 4 groups were fed experimental diets with 4 protein levels, which were 36% (group Ⅰ ) , 32% (group Ⅱ ) , 28% (group Ⅲ) and 24% (group Ⅳ) , respectively. The experiment lasted from February 13th 2010 to June 5th 2010. The results showed as follows; compared with the groups Ⅲ and Ⅳ , the beginning of oestrus time was advanced for blue foxes in groups Ⅰ and Ⅱ ; conception rate of blue foxes had showed the same trend of normal distribution in different groups; the highest breeding rate of blue foxes was observed in group Ⅱ which was significantly higher than that in group Ⅲ (P <0. 05) ; foxes in different groups had no significant difference in litter size (P > 0. 05) , but the birth weight of larva foxes in groups I and II was significantly higher than that in group Ⅳ (P <0. 05) ; with the decrease of dietary protein levels , litter weight of larva foxes and conception rate of blue foxes were increased at first and then decreased and the birth survive rate of larva foxes showed a decreasing trend, but all did not reach a significant level (P > 0. 05). In conclusion, the optimal dietary protein level is 33.14% for blue fox during the reproduction period.
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