The efficiency with which a given set of environmental resources are utilized to produce beef may vary considerably among various alternative uses of the existing genetic resources. Conversely, the efficiency of production of a given set and use of genetic resources may vary according to the environmental resources. In real life one set of resources is not fixed and the other adjusted, but rather they tend to be simultaneously adjusted. However, for this discussion, I am going to consider the environmental resources; which in this context includes management, economic and marketing considerations; to be fixed in order to examine the effect of varying the genetic resources on efficiency of beef production. 

T. C Cartwright, H. A Fitzhugh

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 643–653, 1974
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