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.［Chinese Journal of Animal Nutrition, 2011, 23（7）：1253 -1258］
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