湖寒杂交F1代与小尾寒羊生长性能比较研究

试验旨在研究母本小尾寒羊与父本湖羊的杂交F1代在生长性能方面具有的杂交效果。试验以小尾寒羊为对照，选择新生（0日龄）小尾寒羔羊和湖寒杂交F1代羔羊，在相同舍饲饲养条件下，进行羔羊补饲（6~45日龄）和育肥（46~150日龄）试验研究。结果显示，杂交F1代羊初生重、断奶重、3月龄体重、5月龄体重分别比小尾寒羊提高20.00%、25.17%、19.92%及20.42%，差异极显著（P < 0.01）；补饲期和育肥期的平均日增重分别比小尾寒羊提高26.91%（P < 0.01）和17.63%（P < 0.01）。湖寒杂交F1代羊育肥到5月龄时，其体高、胸围、管围等生长指标极显著高于小尾寒羊（P < 0.01），而体斜长不存在显著性差异（P > 0.05）。杂交F1代羔羊腹泻率比小尾寒羊降低8.33%，成活率提高5.55%。试验期末，5月龄杂交F1代羊经济效益比小尾寒羊提高69.34%。研究表明，利用湖羊改良本地肉羊品种小尾寒羊，其羔羊成活率和宰前活重明显提高，杂种优势明显。

Comparison on the Growth Performance between F1 Hybrid of Small-tail Han Sheep × Hu Sheep and Small-tail Han Sheep

This experiment was carried out to evaluate heterosis of the F1 hybrid of female Small-tail Han sheep and male Hu sheep in growth performance.The newborn lambs from Small-tail Han sheep and F1 hybrid of Small-tail Han sheep × Hu sheep were used in supplementary feeding (6 to 45 days old ) and fattening (46 to 150 days old) under the same conditions.The results showed that F1 hybrid were extremely significantly higher than Small-tail Han sheep in birth weight,weaning weight,three months weight and five months weight (P < 0.01),which were increased by 20.00%,25.17%,19.92% and 20.42%,respectively.The average daily gain of F1 were also extremely significantly higher than that of Small-tail Han sheep in both supplementary feeding period and fattening period (P < 0.01),the increase were 26.91% and 17.63%,respectively.At 5-month old,body height,chest circumference and cannon circumference of F1 hybrid were extremely significantly higher than that of Small-tail Han sheep (P < 0.01),but the body length had no significant difference (P > 0.05).The diarrhea rate of F1 hybrid was 8.33% lower than that of Small-tail Han sheep,and the survival rate was 5.55% higher.In addition,the economic benefit of F1 hybrid was 69.34% more than that of Small-tail Han sheep at the end of the experiment.The results suggested that the heterosis was obvious,meanwhile the survival rate and pre-slaughter live weight of F1 progenies could be significantly improved.