The value of an animal is almost always affected by several traits. Therefore the breeder has to consider different characteristics when choosing the most valuable animals as parents for the next generation. Further, the amount of information may also vary from one individual to another. There are many ways of selecting animals for breeding, but the most efficient method is that which usually results in maximum genetic improvement per unit of time. 

K. Ronningen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 565–577, 1974
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