乔科型藏羊选育效果研究

Study on Breeding Effect of Qiaoke Tibetan Sheep

摘要:

乔科型藏羊本品种选育核心群公、母羔平均初生重为(3.98±0.95)和(3.75±0.87) kg;选育群6月龄公羔生产性能(体高、体长、胸围、体重)同未选育群相比较分别提高4.15 cm、4 cm、3.35 cm和3.00 kg,选育群母羔生产性能(体高、体长、胸围、体重)同未选育群相比分别提高3.7 cm、3.71 cm、2.65 cm和2.74 kg;选育群18月龄公羊生产性能(体高、体长、胸围、体重)同未选育群相比较分别提高2.67 cm、3.1 cm、2.98 cm、5.51 kg,选育群母羊生产性能(体高、体长、胸围、体重)同未选育群相比较分别提高2.60 cm、2.80 cm、1.20 cm、3.00 kg;成年公、母羊平均体重为(66.8±4.10)和(58.92±4.57) kg,未选育群成年公、母羊平均体重为(63.00±3.82)和(56.44±3.71) kg,分别增重3.8和2.48 kg,提高5.83%和4.33%,选育群成年公、母羊体高、体长、胸围同未选育群相比较分别提高3.46 cm、3.96 cm、5.69 cm,3.60 cm、3.80 cm、4.60 cm。经过两年按选育标准严格选育,核心群羊只结构调整优化显著,符合标准的后备种公羊数量,优秀适龄母羊个体比例显著提高,其中特级和一级分别提高了5.2%、9.7%,繁殖成活率提高2.1%。结果表明:乔科型藏羊本品种选育结果较理想。

Abstract:

The average birth weights of male and female lambs were 3.98±0.95 and 3.75±0.87 kg in the breeding core group of qiaoke tibetan sheep.The performance (body height,body length,chest circumference and body weight) of 6monthold male lambs in the selected group were increased by 4.15 cm,4 cm and 3.35 cm and 3.00 kg,respectively,compared with the nonselected group.The production performance (body height,body length,chest girth and body weight) of female lambs in the selected group were increased by 3.7 cm,3.71 cm and 2.65 cm and 2.74 kg,respectively,compared with those in the unselected group.The production performance (body height,body length,chest circumference and body weight) of 18monthold RAMS in the selected group was increased by 2.67 cm,3.1 cm,2.98 cm and 5.51 kg,respectively,compared with the nonselected group.The performance (body height,body length,chest circumference and body weight) of ewes in the selected group were increased by 2.60 cm,2.80 cm,1.20 cm and 3.00 kg,respectively,compared with those in the unselected group.The average body weight of adult male and female sheep was 66.8±4.1 and 58.92±4.57 kg,and the average body weight of adult male and female sheep in unbred herds was:63.00±3.82 and 56.44±3.71 kg were increased by 3.8 kg and 2.48 kg,5.83% and 4.33%,respectively.The body height,body length and chest circumference of adult male and female sheep in the selected group were increased by 3.46 cm,3.96 cm and 5.69 cm,respectively,compared with those in the unselected group.3.60 cm,3.80 cm,4.60 cm.After two years of strict selection according to the breeding standards,the structure of the core flock of sheep was adjusted and optimized significantly,the number of reserve breed RAMS meeting the standards increased,and the proportion of excellent ageappropriate ewes was significantly increased,among which the special grade and the first grade were increased by 5.2 and 9.7 percentage points respectively,and the reproductive survival rate was increased by 2.1 percentage points.The breeding results of qiaoke tibetan sheep were satisfactory.