Comparison of long-term selection responses of breeding policy in dairy herds
|Kateg. publikace||Vědecké publikace impaktované|
Genetic and economic responses were evaluated for different breeding arrangements: using tested or proved bulls, negative selection of cows or first-calvers, discarding of heifers and purchase those with higher breeding value and embryo transfer. Simulations for single use of breeding arrangements and their consequences over a fifty-year period were carried out for the above models using the gene flow method. The use of bulls can be recommended as the best breeding policy, especially the use of proved bulls at high selection intensity. Culling of cows and heifers are less economically advantageous. The replacement of heifers with ones with higher breeding value provided relatively high genetic gain but it was rather costly due to high purchasing costs.Embryo transfer was not economically advantageous, it can be recommended for production of sons for insemination.
|Oddělení||Genetika a šlechtění hospodářských zvířat|
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