When animals, domestic and laboratory, are maintained as breeders, efficient production of progeny is desired.Factors involved are ease of becoming pregnant, pre-partum, health, lactation etc. If animals exhibit efficient reproduction for a long-time, the cost of maintenance during their lifetime (until death or culling) will be lowered relative to the monetary returns from production, and unnecessary increases in inbreeding due to a rapid turnover of parents can be avoided.

J. Nagai, A. Yokoyama

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 39–43, 1982
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