饲粮蛋白质水平对冬毛生长期水貂生长性能、血清生化指标及毛皮质量的影响

本文旨在探讨饲粮蛋白质水平对水貂生长性能、营养物质消化吸收、毛皮品质和血清生化指标的影响.随机选取日龄体重相近的70只健康公水貂平均分至5组,饲喂5个蛋白质水平的饲粮(32%、28%、24%、20%和16%),每千克干物质中含蛋白质分别为326.4、284.7、249.3、203.9和172.8 g.试验组编号分别为P...

Effects of Different Dietary Protein Levels on Growth Performance, Serum Biochemical Parameters and Fur Characteristics of Minks in Winter Growing-furring Period

The study investigated the effects of different dietary protein levels on growth performance, nutrient digestion and absorption, fur characteristics, as well as serum biochemical parameters in growing-furring minks. Seventy healthy male minks were subjected to 5 experimental dietary protein treatments as P32, P28,P24, P20 and P16 32% , 28% , 24%, 20% and 16% crude protein (CP), respectively], and the measured protein contents of the diets were 326.4, 284.7, 249.3, 203.9 and 172.8 g/kg dry matter (DM), respectively. The results showed that from mid-September to pelting, the digestibility of CP declined with the dietary protein level reducing ( P ＜0.01 ); digestibility of ether extract in treatment P16 was significantly lower than that in the other groups (P ＜0.01 ); nitrogen (N) intake, urinary N excretion and N retention increased linearly with the dietary protein level increasing; serum urea nitrogen decreased linearly with the dietary protein level declining ( P ＜ 0.05 ); there was no significant difference in serum total protein among all groups ( P ＞ 0.05); body length, skin length and dry skin weight declined along with the decrease of dietary protein level;and the length of guard-fur and under-fur were not affected by different dietary protein levels (P ＞ 0.05 ).Considering all the factors, the level of dietary protein should be at about 284.7 g/kg DM, and 244. 5 g/kg (DM basis) digestible protein could meet the requirement of minks in growing-furring period. Furthermore,the urinary N could be decreased by 22.45% in this period when dietary protein level declined from 32% to 28%, which would be beneficial to reduce the feed costs and lower nitrogen emissions to the environment.