Winter Foraging Plants of Domestic Sheep in Hulunbeir Grassland

Winter food constitution and favorite level of domestic sheep were studied with the microhistological analysis technique of feces in Hulunbeir Grassland. some problems were inquired into, such as the quality state of local herbage resource, improvement of pasture, rational use of herbage, etc. The results showed that the staple food of domestic sheep in winter was Gramineae, which made up 73.3 percent of the total foraging species. Fabaceae was second, 11.6 per cent. Composite took third place, 7.4 per cent. The proportion of other species were very small.

呼伦贝尔地区枯草期肉羊育肥模式的研究

为了解决呼伦贝尔地区秋冬季天然草地枯草期较长、草料短缺和质量下降造成肉羊“秋瘦、冬死”的问题,试验动态监测了当地天然草地生物量和粗蛋白含量的变化,制订出可满足枯草期肉羊营养需求的饲养方案,采用盛草期“放牧+草颗粒补饲”和枯草期“放牧+干草+草颗粒补饲”的饲养技术,探索适合于呼伦贝尔草原区枯草期的肉羊育肥模式并分析其经济效益。结果表明:与盛草期(8月12日)相比,枯草期(9月12日)的天然草地地上生物量显著降低了42.4%(P<0.05),粗蛋白含量显著降低了7.16%(P<0.05),制订的日粮制度是:9—10月份,除放牧外每只肉羊每天补充草颗粒0.25 kg;10—11月份,除放牧外每只肉羊每天补充0.5 kg草颗粒和2 kg干草;11—12月份进行舍饲,每只肉羊每天补充0.75 kg草颗粒和2 kg干草。与传统放牧方式比较,此饲养模式下每只羊体重增重5 kg左右,达到41.41 kg,扣除饲养成本,每只羊新增利润37.9元以上。说明该肉羊育肥模式明显提高了呼伦贝尔肉羊养殖水平和经济收益,可以在有条件的牧户或牧场进行推广。

不同排酸时间对呼伦贝尔肉羊宰后品质的影响

研究呼伦贝尔羊不同部位肌肉,在排酸库吊挂排酸0、1、2、3、4 d,并分别进行冷冻后肉品质的变化情况,探讨肌肉宰后成熟机理,确定羊肉最佳排酸时间。结果表明,在排酸期间,羊肉pH值、蒸煮损失率、剪切力值差异显著(P<0.05)。pH值呈先下降后上升趋势,蒸煮损失率和剪切力值则呈先上升再下降趋势,排酸2 d的剪切力值最低、蒸煮损失率较低、羊肉品质最佳。