论当前肉牛改良育种中的问题

Problem in Genetic Improvement of Beef Cattle Production in the China Today

杂交改良是２０余年来我国肉牛生产的主要实践。杂交是育种的方法之一．但它同正规的育种工作是有界限的。人们在进行杂交工作时，是搞一般的经济杂交，还是进行育种，目的一定要明确。从育种的要求看，不可在一个小的地域内搞“多品种杂交系列”．无计划、无控制地杂交会打乱牛群的遗传基础。我国肉牛发展出路在于育种，如果人们在这几个方面形成共识，我国肉牛业的发展就有了新的起点。

Genetic improvement by crossing was a main practice for more than 20 years in beef cattle production in China. Crossing is a method of breeding, but not means the general breeding.Crossing can be used for different purposes, commercoal crossing or crossbreeding.For the purpose of breeding, multiple breed crossing in a small area may disorder the genetic bases of herds.