本试验旨在研究饲粮脂肪水平对蓝狐生长性能、体脂沉积及血清生化指标的影响.选取(55±5)日龄、体重相近的健康蓝狐64只,随机分成4组,每组8个重复,每个重复2只(公母各占1/2),分别饲喂脂肪水平为12％、26％、40％和54％的试验饲粮.预试期为10 d,正试期为156 d.结果表明,试验狐各阶段日增重随饲粮脂肪水平的增加呈现先升高再降低的趋势,而血脂、血糖及内脏脂肪率则呈逐渐升高的趋势.当脂肪水平达到54％时,试验狐的肝脂率和肝体指数均显著高于其他组(P＜0.05).母狐血清生化指标与体脂沉积各性状的相关性比公狐高.血清甘油三酯和高密度脂蛋白胆固醇水平与肝脂率、肝体指数及内脏脂肪率呈显著正相关(P＜0.05).经对蓝狐生长性能、体脂沉积、血清生化指标综合分析得出,蓝狐具有较高的脂肪耐受性,但育成期蓝狐饲粮脂肪水平不宜超过40％,公狐以饲粮脂肪水平26％组,母狐以饲粮脂肪水平40％组生长最快.%The trial was conducted to evaluate the effect of dietary fat levels on growth, body fat deposition, and serum biochemical parameters of growing blue foxes (Alopex lagopus). Based on age and initial body weight, a total of 64 blue foxes were randomly assigned into 4 groups with 8 replicates per group and 2 foxes per replicate (half male and half female). Foxes in four groups were fed with experimental diets containing 12% , 26% , 40% or 54% fat, respectively. The experiment included an adaptation period for 10 days and a test period for 156 days. The results showed as follows; with the increasing dietary fat levels, daily gain weight of growing blue foxes was firstly increased and then decreased, while the contents of fat and glucose in serum and visceral fat percentage (VFP) were improved at different stages. When the dietary fat level was 54% , hepatic fat percentage (HFP) and hepatic somatic index (HIS) were significantly higher than those in other groups (P <0.05). The correlation between serum biochemical parameters and body fat deposition in females was higher than that in males. Serum triglyceride and high-density lipoprotein cholesterol (HDL-C) were positively correlated with LFP, HIS and VFP (P <0.05). On the basis of these results, it is concluded that blue foxes have higher tolerance to fat, but the dietary fat level of growing blue foxes should be less than 40%. Males fed diet with 26% fat level and females fed diet with 40% fat level have the greatest growth performance.
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