A simulation study was used to resemble various closed nucleus herds of pig breeding companies. Selection response of the aggregate breeding values using an animal model (AM) was 28.6% (24 boars/120 sows) and 32.4% (24 boars/180 sows) higher than using selection index (SI). These results are due to the fact that correlation between true and estimated breeding values increased by 25%. It has been found out that the influence of population size on selection response using BLUP animal model is important and resulted in 9% increase per year between the above mentioned alternatives. In populations of boars with modified sequential culling (29 boars/120 sows and 33 boars/180 sows) BLUP leads to an optimal boar-sow ratio of 1:4 and 1:5.5, respectively. In the last alternative with the lowest generation interval, rate of inbreeding using BLUP animal model is'88% higher than using selection index.

R. Rohe, J. Krieter, E. Kalm

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 469–472, 1990
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