A closed nucleus dairy cattle population with multiple ovulation and embryo transfer (MOET) was stochastically simulated over 10 generations. Four mating designs were examined to identify the mating system which achieves a balance of genetic response and inbreeding in dairy herds. A population was divided into two sub-populations in designs 2, 3 and 4. Mating was independently carried out within each sub-population in design 2, and mating was carried out between two sub-populations in every other generation in designs 3 and 4. Design 1 gave the largest genetic response at high provability with a relatively high rate of inbreeding. The average annual rate of inbreeding in designs 3 and 4 were very small, and these results indicated the sub-population mating system was effective to suppress the increase of inbreeding. Relative inbreeding to response ratio (RIRR) in design 4 was the smallest, and the mating system adopted in design 4 would be suitable to achieve a balance of genetic response and inbreeding.

Y. Terawaki, M. Suzuki, Y. Fukui

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 25: Lactation; growth and efficiency; meat quality; role of exotic breeds in the tropics; design of village breeding programmes;, , 471–474, 1998
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