Designing aquaculture mass selection programs to avoid high inbreeding rates
2002
Bentsen, H.B. | Olesen, I.
A series of replicated stochastic simulations was carried out to determine the effect of the number of breeders selected (4-100 pairs), the number of progeny tested (5-150 progeny per pair) and the magnitude of the heritability (0.1-0.4) on the rate of inbreeding, and the response to selection through 15 generations of mass selection. It was found that to keep inbreeding rates low (about 1% per generation), a minimum of 50 pairs of breeders should be selected and the number of progeny tested should be restricted and standardized to not less than 30-50 progeny per pair. These designs resulted in a response to selection (average per generation) of 5-13% of the base population mean depending on the heritability. Testing larger numbers of progeny resulted in a marginal increase in response to selection. Reducing the number of broodstock pairs might increase the rate of inbreeding to as much as 6-8% per generation. Loss of genetic variation because of inbreeding was then found to reduce the response to selection by more than one third. In addition, a further reduction is likely to occur because of inbreeding depression.
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