优质肉用羊三元杂交技术

利用阴道海绵栓法和孕马血清同期化处理试验母羊,通过人工授精的方式,采用杜泊种公羊和巴美肉羊种公羊与巴寒杂交F1代母羊和杜寒杂交F1代母羊进行三元杂交,作为试验组;选择同龄当地小尾寒羊种公羊和小尾寒羊母羊自然交配,作为对照组,进行比较,观察杂交改良后的效果。结果表明,杂交F1代母羊的受胎率、产羔率低于小尾寒羊,但在生产性能方面,三元杂交F2代羔羊平均初生重和1月龄体重比当地小尾寒羊分别提高1.68kg和2.02kg;在相同的饲养管理条件下,三元杂交F2代羔羊体高、体长、胸围等均高于当地同龄小尾寒羊,其生长发育速度显著快于当地小尾寒羊。由此可以得出,以杜泊种公羊和巴美肉羊种公羊与巴寒杂交F1代母羊和杜寒杂交F1代母羊进行三元杂交改良,改良效果明显。

Three-way Cross Technology of Excellent Meat Sheep Breeds

After tested female sheep were treated by using vaginal sponge method and pregnant mare serum, male Dorper sheep and male Bamei sheep were improved by three-way cross with female Bahan F1 hybrid sheep and female Duhan F1 hybrid sheep by using artificial insemination, meanwhile male small-tail Hart sheep of the same age was mated with female small-tail Han sheep, which was taken as control. The improvement effect was observed. Results showed that the conception rate and lambing rate of female FI hybrid sheep were lower than that of small-tail Han sheep; but in the aspect of production performance, the average birth weight and the weight at 1 month of age of F2 three-way hybrid sheep were increased by 1.68 kg and 2.02 kg compared with local small-tail Han sheep; under the same feeding and management conditions, the height at withers, body length and heart girth F2 three-way hybrid sheep were higher than that of local small-tail Han sheep. Therefore, the improvement effect was obvious when male Dorper sheep and male Bamei sheep were improved by three-way cross with female Bahan Fi hybrid sheep and female Duhan Fl hybrid sheep.