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nai niu nai liang xiao zheng xi shu ji qi ying yong yan jiu
Author(s): 
Pages: 77-79
Year: Issue:  8
Journal: Heilongjiang Animal Science and Veterinary Medicine

Abstract:  奶牛的选种工作主要依据生产性能记录,将生产性能好、遗传性能稳定的优良个体选出并逐步提高其生产性能.但奶牛产奶量的高低除了受遗传因素的影响外,还受非遗传因素的影响.
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