The object of this paper is to challenge the old and very often unjustified believe that the genetic improvement of cattle in tropical and subtropical regions «must always be strictly relative to the prevailing environment® viz. that the aim of the breeder should be to breed cattle «whose genetic potentialities conform as closely as possible to the facilities of that environment for optimum phenotypic expression and that the limits set by that environment must never be exceeded® (1).

D. R Osterhoff

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2, Madrid, Spain, 273–279, 1974
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