饲粮L-精氨酸添加水平对冬毛期水貂生长性能、营养物质消化率及氮代谢的影响

Effects of Dietary L-Arginine Supplemental Level on Growth Performance,Nutrient Digestibility and Nitrogen Metabolism of Mink during Winter Fur-Growing Season

本试验旨在研究饲粮L-精氨酸添加水平对冬毛期水貂生长性能、营养物质消化率及氮代谢的影响。本试验选取（150±3）日龄、体重相近的雌性健康水貂63只,随机分成7个组,每组9个重复,每个重复1只水貂。7组水貂分别饲喂L-精氨酸添加水平为0（Ⅰ组）、0.2%（Ⅱ组）、0.4%（Ⅲ组）、0.6%（Ⅳ组）、0.8%（Ⅴ组）、1.0%（Ⅵ组）和1.2%（Ⅶ组）的试验饲粮。预试期7d,正试期60d。结果表明：1）各组水貂末重差异不显著（P〉0.05）。Ⅴ组水貂的平均日增重有高于其他各组的趋势,但差异不显著（P〉0.05）。Ⅴ组水貂的料重比显著低于Ⅰ、Ⅱ和Ⅲ组（P〈0.05）。2）干物质采食量、干物质排出量以及干物质、蛋白质和脂肪消化率各组之间差异不显著（P〉0.05）。3）Ⅳ组水貂的尿氮显著低于Ⅰ组（P〈0.05）。Ⅳ组水貂的蛋白质生物学价值极显著高于Ⅵ、Ⅶ组（P〈0.01）,显著高于Ⅰ、Ⅱ组（P〈0.05）。由此得出,饲粮中L-精氨酸添加水平为0.6%～0.8%,即饲粮中精氨酸总水平为2.30%～2.50%时,冬毛期水貂可以获得较好的生长性能和蛋白质生物学价值。

This study was conducted to study the effects of dietary L-arginine（L-Arg）supplemental level on growth performance,nutrient digestibility and nitrogen metabolism of mink during winter fur-growing season.Sixty-three healthy female mink at the age of（150±3）days with the similar body weight were randomly divided into 7groups with 9replicates each and 1mink per replicate.The mink in the 7groups were fed experimental diets with L-Arg supplemental level of 0（group Ⅰ）,0.2%（group Ⅱ）,0.4%（group Ⅲ）,0.6%（group Ⅳ）,0.8%（group Ⅴ）,1.0%（group Ⅵ）and 1.2%（group Ⅶ）,respectively.The pre-test period lasted for 7days,and the trial lasted for 60 days.The results showed as follows：1）the final weight had no significant difference among all groups（P〉0.05）.The average daily gain of the groupⅤ was tendentiously higher than that of the other groups,but the difference was not significantly（P〉0.05）.The feed/gain of the group Ⅴ was significantly lower than that of groupsⅠ,Ⅱ andⅢ（P〈0.05）.2）The dry matter intake,dry matter output,dry matter digestibility,protein digestibility and fat digestibility had no significant differences among all groups（P〉0.05）.3）The urine nitrogen of the group Ⅳ was significantly lower than that of the group Ⅰ（P〈0.05）.The biological value of protein of the groupⅣ was greatly significantly higher than that of groupsⅥandⅦ（P〈0.01）and was significantly higher than that of groupsⅠ and Ⅱ（P〈0.05）.In conclusion,when dietary LArg supplemental level is 0.6%to 0.8%,that is the total arginine level in the diet is 2.30%to 2.50%,the mink will get the better growth performance and biological value of protein during winter fur-growing season.