鲁西黄牛肉用品系育种目标性状和选择性状研究

为了选育鲁西黄牛肉用品系,结合鲁西黄牛肉用品系育种实际,经过系统分析,确定了鲁西黄牛肉用品系近期的育种目标性状和相应的选择性状,并采用差额法计算了各选择性状的边际效益。结果表明,鲁西黄牛肉用品系近期的育种目标性状有3类,分别为生长发育性状、胴体性状和繁殖性状,包括有周岁质量、育肥期日增质量、生长能力、胴体等级、屠宰率、初产年龄、产犊间隔和射精量8个选择性状。在预期的市场和生产条件下,对于上述各选择性状的边际效益分别为:5.71元/kg,0.90元/g,2.84元/kg,402.00元/级,60.30元/%,-3.52元/d,-6.16元/d,55.23元/mL;通过遗传标准差校正,3类性状中生长发育、胴体性状和繁殖性状的经济权重之比为0.55∶0.21∶0.24,近似于2∶1∶1。说明鲁西黄牛向肉用方向发展过程中,需要加强生长发育性状的选择力度,同时要兼顾胴体性状和繁殖性状的选择。

Study on the breeding objective traits and selected traits for beef line of Luxi cattle

Kiwifruit,a very old fruit tree resources originated from China,was a wild fruit tree for a long time.It introduced into western countries and was domesticated there and,finally,kiwifruit production formed a new industry.Kiwifruit is famous for its rich nutrition.China's kiwifruit industry started in 1970s,and was expanded and got strong in 1990s,but it still far behind the western countries owing to the difference of diet customs.After China's entry into WTO,if we utilize the rich fruit tree resources,learn the successful experiences from western countries and make use of the advantage of labor force of our country,China can surpass western countries in fruit production,and can create world-famous Chinese brands.