Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China.
J Anim Physiol Anim Nutr (Berl). 2012 Aug;96(4):610-7. doi: 10.1111/j.1439-0396.2011.01186.x. Epub 2011 Jul 9.
The objective of this study was to determine whether nutrient digestibility and production performance of growing-furring blue foxes (Alopex lagopus) are affected by different dietary fat levels. Sixty-four young animals were randomly assigned to four groups (A, B, C, D) provided with diets containing approximately 12%, 26%, 40%, 54% fat in the dry matter respectively. When dietary fat level was increased, the apparent digestibility of main nutrients except for crude carbohydrates, and gross energy were improved (p < 0.0001). The amount of nitrogen excreted was reduced and the biological value of protein was enhanced (p < 0.0001). Over the experimental phase, the efficiency of metabolizable energy (ME) used for gain in group B (26% fat content) was higher than that in other groups. When diets with 12-26% fat content were fed, there was an increasing tendency in skin size. But it had negative effects on skin size and fur quality when the amount of fat content was over 40%. In conclusion, the experiment showed that dietary fat could significantly improve some nutrient utilization and significantly reduce feed/gain ratio as a main energy source. The most preferable fur quality and efficiency of ME used for gain were obtained when diet contained 26% fat level in growing-furring period.
本研究旨在确定不同的日粮脂肪水平是否会影响生长育肥蓝狐（Alopex lagopus）的养分消化率和生产性能。64 只幼狐被随机分配到四个组（A、B、C、D），分别提供脂肪含量约为干物质的 12%、26%、40%和 54%的日粮。随着日粮脂肪水平的增加，除粗碳水化合物和总能外，主要养分的表观消化率得到改善（p<0.0001）。氮的排泄量减少，蛋白质的生物学价值提高（p<0.0001）。在实验阶段，组 B（26%脂肪含量）的可代谢能（ME）用于增重的效率高于其他组。当饲喂脂肪含量为 12-26%的日粮时，狐皮面积有增大的趋势。但当脂肪含量超过 40%时，对狐皮面积和毛皮质量有负面影响。总之，实验表明，日粮脂肪可以显著改善一些养分的利用，作为主要能量来源，显著降低饲料/增重比。在生长育肥期，日粮脂肪水平为 26%时，可获得最佳的毛皮质量和 ME 用于增重的效率。
