不同营养水平精饲料对云南半细毛羊增重及养分消化率的影响

目的]探究补饲精料对云南半细毛羊增重及养分消化率的影响,以筛选适合云南半细毛羊的精料补充料配方。方法]采取单因子4水平随机区组试验设计方法,研究了补饲高、中、低3种营养水平的精料补充料和1个对照组对48只云南半细毛羊(雌、雄各半)增重及养分消化率的影响。结果]补饲高、中、低3种营养水平的精料补充料,绵羊的日增重分别比对照组极显著提高76%、94%和110%,每只羊收益分别增加106.19、145.83和179.64元;云南半细毛羊在生长前期(3～6月龄),羊只对精饲料的消化能力随着营养水平的提高而提高,但在生长后期饲喂低营养水平的日粮反而使羊只产生补偿代谢,除对精饲料中的干物质消化率逐渐提高外,对其余养分的消化率均是先降低后升高。结论]补饲精料能极显著提高云南半细毛羊的日增重和收益;建议云南半细毛羊3～5月龄公羊补饲营养水平参考该试验前期低水平标准进行,母羊参考试验前期中水平标准进行,而6～9月龄公、母羊补饲营养水平均参考该试验后期的高水平标准进行。

Effects of Different Nutritional Levels of Diets on Digestibility and Growth Performances of Yunnan Semi-wool Sheep

Objective ] The aim was to study the effects of different nutritional levels of diets on digestibility and growth performances of Yun- nan semi-wool sheep so as to screen out the optimal formula of concentrate supplement. Method] Effects of three nutritional levels of diets and one control on the digestibility and growth performances of 48 Yunnan semi-wool sheep with half male and half female were studied by u- sing random block experimental design. Result ] Compared with control, the daily gain of sheep fed by low, medium and high nutrition levels of concentrated feed were significantly increased by 76% , 94% and 110% , and the income of each sheep were increased by 106.19, 145.83 and 179.64 yuan, respectively. As for Yunnan semi-fine wool sheep, the digestibility of sheep at early growth stage （3 -6 months） increased with the increase of nutrient level, but the sheep fed diets with low nutrient levels at the late growth stage produced compensation metabolism, and the rest of nutrient digestibility were firstly decreased and then increased except the digestibility of dry matter in feed were increased gradu- ally. Conclusion] Concentrate supplementation could significantly increase the weight gain and income of Yunnan semi-fine wool sheep. It is suggested that the male Yunnan semi-fine wool sheep at 3 -5 months old should be fed with concentrate supplementation according to the low level standard of early test in the experiment, and the female sheep should be fed with concentrate supplementation according to the medium level standard, while the male and female sheep at 6 -9 months should be fed with concentrate supplementation according to the high level standard of later test.