不同肉羊杂交组合筛选试验

Screening Test of Crossbred Combinations of Different Mutton Sheep

定西肉羊是专指小尾寒羊与本地羊杂配,形成的不同代次的杂种羊和长期驯化已适应本地生存环境条件的小尾寒羊,两种群体经过近三十年杂交改良和当地群众精心选育、提纯复壮、扩群繁殖,培育的具有鲜明地方特色的良种肉羊群体。本试验选陶定F1、特定F1、萨定F1、杜定F1、定西肉羊及小尾寒羊2月龄断奶公羔各10只,共60只按不同杂交组合进行分组,每组10只,研究探讨同一营养水平条件下,不同杂交育肥羔羊增重效果和产肉性能的影响。结果表明,特定F1、陶定F1平均日增重分别为278.78g、257.67g、分别比定西肉羊提高24%和18%(P<0.05),比小尾寒羊提高32%和26%(P<0.01);屠宰率分别比定西肉羊提高7个百分点和5个百分点,比小尾寒羊提高10个百分点和8个百分点;饲养1只特定F1与陶定F1肥羔羊,分别比定西肉羊多增收88元和36元,比小尾寒羊多增收181元和128.26元。

Dingxi mutton sheep are hybrid sheep crossed with small--tail sheep and local sheep as well as acclimated small-tail sheep. Two groups of Dingxi mutton sheep were formed by careful breeding, purification rejuvenation, expansion group breeding after three decades of hybrid improvement. In this study,60 weanling male lambs of Taodin F1, Fx,Teding Fa ,Sading F1 ,Duding F1, Dingxi mutton sheep and small--tail sheep were selected and divided into 10 groups according to different cross- ing combination. Effects of different crossing combination on daily gain and mutton yield of fattening lambs. The results showed that average daily gain of Teding F1 and Taodin F1 g F1 were 278.78g and 257.67g, respectively, which increased by 24 % and 18% compared with Dingxi mutton sheep （P% d0.05） ,and increased by 32% and 26% compared with Small --tail sheep ,re- spectively （P^0.01）. The slaughter rate was increased by 7% and 5% , respectively compared with Dingxi mutton sheep, 10% and 8% compared with Small--tail Han sheep. Profits of the fatting lamb of Teding F1 and Taoding F1 were increased by 88 yuan and 36 yuan in Dingxi mutton sheep and increased by 181 yuan and 128.26 yuan,compared with small-- tail sheep, respectively.