尿素糖蜜多营养舔砖补饲牦牛效果的研究

分别在天祝县和碌曲县选用９０头天祝白牦牛和６０头甘南牦牛进行了冷季放牧牦牛尿素糖蜜多营养舔砖的补饲试验，尿素糖蜜多营养舔砖含尿素１０％，糖蜜１０％，采食量为０．５ｋｇ／（ｄ·头）。经５个月补饲后，天祝白牦牛和甘南牦牛的活重损失分别减少８０．３％和４６．８％，产奶量分别提高２０％和１３．６％，怀孕率分别提高１７．４和２０．０个百分点，投入产出比分别达到１∶３．５０和１∶２．１１。处理组与对照组之间存在极显著差异（Ｐ＜０．０１），证明尿素糖蜜多营养舔砖是实施高寒牧区放牧牦牛冷季补饲的一条新的有效途径

Supplementary Feeding on Urea Molasses Multinutrient Blocks and Effects on Productive Performance of Yak Cows

Trials on cold-season supplementary feeding on urea molasses multinutrient blocks (UMMB) were conducted in Gansu province respectively in Tianzhu county for 90 white yak cows and in Luqu county for 60 black ones. The blocks, which contained 10% of urea and 10% of molasses, were given at a daily intake of 0.5 kg per cow through 5 months from December to April. The practice resulted in 80.3% and 46.8% less losses in live weight, respectively, in the white and the black yak group. It also led, respectively in the two yak groups, to 20% and 13.6% more milk yield, 17.4% and 20% higher pregnancy percentage and an input/output ratio of 1/3.5 and 1/2.11. It appeared that supplementary feeding on UMMB by yaks was an effective way to improve their production performance during the cold season in the pastoral counties.