冬季不同饲养密度对肉羊生产性能的影响

Effects of Different Raising Densities on Fattening Performance of Mutton Sheep in Winter

为探讨冬季气候条件下不同饲养密度对舍饲肉羊生长性能的影响,将6月龄体质量相近的144只新疆阿勒泰大尾羊F1代品改断奶羔羊随机分成4组,每组36只,试验1-4组的饲养密度分别为每只0.35m^2、0.7m^2、1.05m^2和1.4m^2,在饲料配方、饲喂与管理方法完全一致的条件下育肥45d。结果表明,各组的总采食量差异不显著（P〉0.05）,1-4组的平均日增质量分别为（87.86±52.26）g、（111.43±57.33）g、（114.34±43.91）g和（137.27±55.93）g,第4组的平均日增质量最大并与第1组、第2组、第3组差异显著（P〈0.05）,第2组与第3组的平均日增质量相近且差异不显著（P〉0.05）,第2组、第3组与第1组差异显著（P〈0.05）;各组的体尺增长与体质量增长趋势完全相同的是体长、体高和胸深,只有管围差异不显著（P〉0.05）。说明,25kg左右的新疆阿勒泰大尾羊F1代羔羊在冬季舍饲育肥时的饲养密度以第2组（每只0.7m2）较为适宜,而且饲养密度显著影响该羊的体高、体长和胸深。

The purpose of this experiment is to investigate the effects of different rasing desities on growth performance of stall-fed mutton sheep in winter.144 Xinjiang Aletai fat tailed sheep F1 hybrid generation of age of 6 months were randomly divided into four groups（group 1,group 2,group 3,group 4）,The raising densities of 1-4groups were 0.35,0.7,1.05,1.4square meter per sheep respectively.The feeding experiment lasted 45 dunder the same conditions of feed formulation,feeding and management methods.The results showed that：no significant difference were found in total feed intake among four groups（P〉0.05）;average daily gain（ADG）of 1-4groups were（87.86±52.26）g,（111.43±57.33）g,（114.34±43.91）g,（137.27±55.93）g,respectively.ADG of group 4was significantly higher than that of other groups（P〈0.05）;ADG of group 2and 3had no significant differences（P〉0.05）,but both were much higher than that of group 1,significantly（P〈0.05）;the growth trend of body weight and body size among four groups were similar except the increase of cannon circumference（P〉0.05）.The analysis showed that the appropriate stall-fed raising density was group 2（0.7square meter per sheep）for the 25 kg Xinjiang Aletai fat tailed sheep F1 hybrid generation in winter.And the raising densities had significant effects on withers height,length and chest depth.