日粮脂肪酸组成对生长期银狐生长性能、营养物质消化率及氮代谢的影响

Effect of Dietary Fatty Acid Composition on Growth Performance,Nutrient Digestion and Nitrogen Metabolism of Silver Fox in the Growing Period

本试验旨在研究日粮脂肪酸组成对生长期银狐生长性能、营养物质消化率及氮代谢的影响。选取12周龄左右、体重相近的健康雄性银狐20只,随机分成2组,每组10个重复,每个重复1只,分别饲喂在基础日粮中添加10%豆油(豆油组)和10%混合油脂(鸡油∶豆油=1∶1)(混合油脂组)的试验日粮。试验期151d,分为育成期(90~145日龄)和冬毛期(146~240日龄)2个阶段。结果表明,日粮脂肪酸组成对育成期和冬毛期银狐的干物质采食量和料重比均无显著影响(P】0.05),但对育成期银狐日增重有显著影响(P【0.05),表现为豆油组显著高于混合油脂组(P【0.05);日粮脂肪酸组成对育成期和冬毛期银狐的蛋白质表观消化率和碳水化合物表观消化率均无显著影响(P】0.05),但对育成期银狐脂肪表观消化率有显著影响(P【0.05),表现为豆油组显著高于混合油脂组(P【0.05);日粮脂肪酸组成对育成期银狐的氮代谢无显著影响(P】0.05),但对冬毛期银狐的蛋白质生物学效价和氮沉积有显著影响(P【0.05),表现为混合油脂组分别显著和极显著高于豆油组(P【0.05;P【0.01)。综合本试验测定指标,建议育成期银狐以豆油作为日粮脂肪主要来源生产性能较好,而冬毛期以混合油脂(鸡油∶豆油=1∶1)作为日粮脂肪主要来源效果最佳。

This experiment was conducted to study the effect of dietary fatty acid composition on growth performance,nutrient digestion and nitrogen metabolism of Silver fox in growing period.Twenty male Silver foxes aged 12 weeks with a similar body weight were randomly divided into 2groups with 10 replicates per group and 1Silver fox per replicate,and they were fed diets supplementing 10% soybean oil(soybean oil group)and 10% mixture oil(chanterelle∶soybean oil=1∶1)(mixture oil group),respectively.The whole experiment period was 151 d,including two phases of days 90 to 145(growing-furring period)and days 146 to 240(winter fur-growthing period).The results showed that dietary fatty acid composition had no effect on the average daily feed intake and F/G(P>0.05),but the everage daily gain from soybean oil group was significantly higher than that from mixture oil group in the growing-furring period(P<0.05).Dietary fatty acid composition had no effect on the digestibility of protein and carbohydrate(P>0.05),but the digestibility of fat from soybean oil group was significantly higher than that from mixture oil group in the growing-furring period(P<0.05).Dietary fatty acid composition also had no effect on the N metabolism(P>0.05),but the biological value of protein and nitrogen retention in mixture oil group were significantly and extremely significantly higher than that in soybean oil group in the winter fur-growthing period(P<0.05;P<0.01),respectively.Considering all the factors,soybean oil was considered to be an optimal fat source in the diets for Silver foxes in the growingfurring period and oil mixture(chanterelle∶soybean oil=1∶1)was the optimal fat source for Silver foxes in the winter furgrowing period in terms of best growth performance.