ESTIMATION OF GENETIC GAIN IN MILK YIELD BY SELECTION IN A CLOSED HERD OF DAIRY CATTLE
ESTIMATION OF GENETIC GAIN IN MILK YIELD BY SELECTION IN A CLOSED HERD OF DAIRY CATTLE
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DOI：
10.1007/bf02986789
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发表时间：
1950-01-01
影响因子：
1.5
通讯作者：
ROBERTSON, A
中科院分区：
文献类型：
--
作者：
RENDEL, JM;ROBERTSON, A
着眼于增加奶牛产奶量的选择问题是一个复杂的问题，因为没有雄性表型因素作为选择的基础。子代测定法应用广泛，但由于管理、年龄等因素，没有被考虑在内。本文讨论了遗传增益率的各种估计方法，并提出了一种估计最大遗传增益率的理论方法。在封闭牛群中直接选择下产奶量的可能遗传增益。的最大可能的增益是近似的。平均值的1%。产率
The problem of selection with an eye to increased milk production in dairy cattle is a complicated one since there is no male phenotypic factor on which to base selection. Progeny testing is widely used but is liable to some errors if such factors as management, age, etc., are not taken into consideration. This paper discusses various methods of estimating the rate of genetic gain and presents a theoretical method of estimation of the max. possible genetic gain of milk yield under direct selection in a closed herd. The max. possible gain is approx. 1% of the avg. yield.