萨福克、特克萨尔同寒滩母羊杂交所产杂一代生长发育和育肥试验

生长发育试验结果表明 ,萨寒滩一代羔羊平均出生重 4 3kg± 0 69kg ,1月龄平均体重1 4 8kg± 1 0 4kg ,3月龄平均体重 32 1kg± 4 5 1kg ,1 0月龄平均体重 4 6 3kg± 5 70kg ;特寒滩一代羔羊的上述指标依次为 4 2kg± 0 68kg、1 4 2kg± 1 1 4kg、34 2kg± 5 70kg、5 0 2kg± 3 99kg ;肥育试验结果表明 ,萨滩寒杂一代 10月龄公羔试验初平均体重 4 7 5kg± 5 39kg ,试验末平均体重 63 6kg±5 2 1kg ,日均增重 2 5 9 7g ;特寒滩同龄一代上述指标依次为 5 6 8kg± 2 99kg、71 1kg± 4 76kg、2 30 6g。

Comparison of Growth and Development Traits among Crossbreds of Dorset and Local Sheep Varieties in Gansu Province

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.

各类型母羊繁育性能分析

自2001年至2004年中,对寒羊、寒滩羊及用国外良种肉羊作父本的三元杂一代母羊不同胎次羔羊初生重、产羔率、成活率、母羊产羔率、母羊妊娠天数、羔羊发病、死亡数及原因进行了统计,并对三元杂一代母羊初情期、初配期、初产期进行了观测。表明在同样舍饲管理和同等营养水平下,同一胎次的三品种母本中,产羔率由高到低为寒羊192.5%、三元杂一代羊140.0%、寒滩羊131.6%,各胎次平均成活率由高到低分别为三元杂一代92.5%、寒滩二元89.7%、寒羊为71.84%,平均初生重单羔由高到低分别为三元杂一代5.34 kg、寒滩羊4.75 kg、寒羊4.42 kg,双羔为三元杂一代4.03 kg、寒滩羊3.88 kg、寒羊3.66 kg,三羔分别为三元杂一代3.12 kg、寒滩羊2.87 kg、寒羊2.73 kg。