Mortality in offspring from birth to weaning adds significantly to production costs of cattle, sheep and swine. In swine, Tess (1981) has shown that a one pig improvement in number weaned results in a 4% reduction in cost of production. The effects of survival on production costs are not as precisely estimated in other species; however, they are certain to be relatively more important in cattle and sheep with smaller numbers of progeny weaned per dam (Dickerson, 1970).
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 310–337, 1982
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