Selection for increased growth-rate generally results in increased fatness as well. This has been found in mice (Biondini et al.. 1976; Eisen et al.. 1977; Fowler, 1958; McPhee and Neill, 1976) and in chickens (Proudman et al.. 1970), This increased fatness is a nuisance agriculturally, since the additional fat reduces carcass quality and is energetically expensive to produce. It is also biologically surprising. Fatty tissue is only 20% water as compared to 80% water for lean. Thus, although deposition of a gram of fat has the same energetic cost as deposition of a gram of protein (Webster, 1980) , the energetic cost for deposition of a gram of fatty^ tissue is Ax that for a gram of lean tissue (Pym and Farrell, 1977). Consequently, selection for increased growth rate should discriminate against animals that deposit fat as opposed to lean, and should lead to decreased rather than increased fatness!

Y. Eitan, T. Agursky, Moshe Soller

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 147-423, 1982
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