Breeding strategies based on progeny test (PT), utilization of selected young bulls (YB), a multiple ovulation and embryo transfer nucleus of 512 cows (MOET), importation of semen of progeny tested sires from Canada and US to produce all the replacement cows (IM), and semen importation for sire-sire path combined with PT (PT+IS) or with YB (YB+IS), were evaluated for the improvement of milk yield of the Mexican Holstein population. Economic and genetic responses from yr 1 to 30 were obtained with deterministic modelling. The rank of strategies on cumulated genetic responses at yr 20 was: MOET, PT+IS, YB+IS, IM and PT with 1563, 1198, 1161, 896 and 822 kg/cow respectively. At yr 30 the ranking was: MOET, PT+IS, YB+IS, PT and IM with 2369, 1721, 1635, 1576 and 1210 kg respectively. The rank of strategies on economic benefits at yr 20 was: MOET, YB+IS, PT+IS, IM and PT with 1002, 881, 833, 381 and 330 Mexican $. At yr 30 the ranking was: MOET, YB+IS, PT+IS, PT and IM with values 1721, 1404, 1372, 762 and 708 Mexican $. The strategy YB+IS appear to be interesting in both genetic and economic terms. MOET nucleus deserves further evaluation versus PT in countries with low proportion of recorded cows.

H. Montaido, B. Mendoza, H. Castro, J. M Berruecos

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 54–56, 1994
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