摘要
In order to improve the meat production performance of local sheep varieties in Gansu Province, Dorset was introduced to crossbreed with the local sheep varieties, including Tan sheep, Small Tail Han sheep and Mongolia sheep. The offspring of different crossbreeding combinations were sampled randomly at different growth stages, and their growth and development traits were measured so as to screen out the best crossbreeding mode. The results showed that under the same crossbreeding mode, the growth rate of F3 was higher than that of F2, and of F2 was higher than that of F1. Among the F3 population, the growth rates of Dorset ×Han and Dorset × Mongolia hybrids were higher. Compared with those of Dorset ×Tan F3 hybrids, the body weights of male and female Dorset × Han and Dorset ×Mongolia F3 hybrids were increased by 5.59%, 4.40%, 5.93% and 3.76%, respectively. Among the F2 population, the growth rates of Dorset × Han and Dorset ×Mongolia hybrids were also higher. The body weights of male and female Dorset ×Han and Dorset × Mongolia F2 hybrids were higher than those of Dorset × Tan ×Han F2 hybrids by 5.99%, 3.67%, 9.80% and 5.00%, respectively. In the F1 population, the growth rates of Dorset × Han and Dorset × Mongolia hybrids were higher.Compared with those of Tan × Han F1 hybrids, the body weights of male and female Dorset × Han and Dorset × Mongolia F1 hybrids were increased by 11.32%,5.22%, 7.60% and 7.20%, respectively. Therefore, in the feeding area of Small Tai Han sheep, Mongolia sheep and Tan sheep, Dorset was the best sire for producing hybrid lambs. The economic benefit of crossbred offspring was obvious.
为提高蒙古羊、小尾寒羊、滩羊的产肉性能,用引进的陶赛特羊分别与其杂交,采用随机抽样的方法,对不同阶段(3月龄、6月龄、周岁)的杂交组合生长发育性状进行测定分析,探讨最佳产肉组合模式。结果表明,杂种三代生长发育速度高于对应的杂种二代,杂种二代高于对应的杂种一代。在杂交三代中,陶寒F_3、陶蒙F_3的生长发育最快,公、母羔体重分别比陶滩寒F_3高5.59%、4.40%、5.93%、3.76%。杂交二代中,仍为陶寒F_2、陶蒙F_2组合生长发育最快,公、母羔体重分别比陶滩寒F_2高5.99%、3.67%、9.80%、5.00%。杂交一代,陶寒F_1、陶蒙F_1发育最快,公、母羔分别比滩寒F1高11.32%、5.22%、7.60%、7.20%。因此,在饲养小尾寒羊、蒙古羊和滩羊地区,以陶赛特羊为父本进行杂交羔羊肉生产,经济效益显著。
