补饲水平对甘肃高山细毛羊生产性能的影响

为了探讨补饲水平对高寒牧区甘肃高山细毛羊生产性能的影响,本研究选择12月龄甘肃高山细毛后备母羊48只,随机分为补饲Ⅰ组(颗粒饲料)、Ⅱ组玉米(Zea mays)和苜蓿(Medicago sativa)干草]、Ⅲ组玉米、苜蓿干草和燕麦(Avena sativa)干草]和对照组(不补饲),进行冬春季"放牧"+"补饲"试验,比较了后备母羊体重,剪毛量,毛纤维长度、细度、白度、强度和伸度等物理指标。结果表明,试验Ⅰ组、Ⅱ组和Ⅲ组试验羊平均日增重分别比对照组高148.29%、133.09%、96.76%;剪毛量各组之间差异不显著(P0.05);自然长度和伸直长度对照组均极显著低于Ⅰ、Ⅱ、Ⅲ组(P0.01),且自然长度Ⅰ组极显著高于Ⅱ组和Ⅲ组(P0.01),伸直长度Ⅲ组极显著低于Ⅰ组和Ⅱ组(P0.01),Ⅱ组显著高于Ⅰ组(P0.05);细度(直径)Ⅰ组最大,Ⅰ组极显著高于对照组(P0.01),且显著高于Ⅱ组(P0.05);白度Ⅰ组最高,Ⅰ组显著高于对照组(P0.05),其他各组之间均差异不显著(P0.05);强度和伸度补饲组均极显著高于对照组(P0.01),且强度Ⅰ组极显著高于Ⅱ组(P0.01),伸度Ⅰ组显著高于Ⅱ组(P0.05)。由此可见,补饲对体重、羊毛品质都有显著正向影响,高寒牧区冬春季节牧草营养缺乏,为了满足羊只营养需要,使甘肃高山细毛羊后备母羊能在1.5岁进行配种繁殖,在冷季放牧的基础上补饲1号料为最佳选择。

Effect of supplemental level on production performance of Gansu alpine fine wool sheep

To study the effects of supplemental level on the production performance of Gansu alpine fine-wool sheep in alpine pastoral areas,we selected 48 twelve-month-old reserve Gansu alpine fine-wool ewes and ran-domly divided them into group Ⅰ (fed pellet feed),group Ⅱ (corn and alfalfa hay),group Ⅲ (corn,alfalfa hay,and oat hay),and control group (no supplementary feeding)for winter and spring"grazing"+"feeding"tests.We compared physical indexes such as body weight,wool production,length,fineness,whiteness, strength,and elongation of sheep wool fiber.The results showed that the average daily gain in groups Ⅰ,Ⅱ, and Ⅲ was higher (148.29%,133.09%,and 96.76%,respectively)than that in the control group.The wool production was not significantly different between the groups (P>0.05).The natural length and stretched length were significantly lower in the control group than in groups Ⅰ,Ⅱ,and Ⅲ (P<0.01).The natural length of group Ⅰ was significantly higher than that of groups Ⅱ and Ⅲ (P<0.01);the stretched length of group Ⅲ was significantly lower than that of groups Ⅰ and Ⅱ (P<0.01);and the stretched length of group Ⅱwas significantly higher than group Ⅰ (P<0.05).The maximum fineness (diameter):the fineness of group Ⅰwas significantly higher than that of the control group (P<0.01)and group Ⅱ (P<0.05).The highest level of whiteness was observed in group Ⅰ,and it was significantly higher than that of the control group (P<0.05);no significant differences were detected between the other groups (P>0.05).The strength and elongation were extremely significantly higher in the supplementary feeding group than in the control group (P<0.01);the strength of group Ⅰ was significantly higher than that of group Ⅱ (P<0.0 1),and the elongation of group Ⅰwas significantly higher than that of group Ⅱ (P<0.05).The feed had a significant impact on the body weight and quality of the wool.Forage nutrition deficiency is observed in winter and spring in alpine pasture areas.To meet the nutritional needs of reserve ewes and make them breed at 1.5 years of age,the feed of group Ⅰ is the best choice on the basis of grazing in the cold season.