Genetic evaluation of the length of productive life in Holstein cattle in the Czech Republic
|Kateg. publikace||Vědecké publikace impaktované|
Survival Kit V3.12 was used to analyse length of productive life of cattle in the Czech Republic. The data set consisted of 230 028 registered Holstein cows. The model included the time-dependent effects interaction of parity and stage of lactation, interaction of herd – year – season, class of milk production within herd and year, breed within years and the time-independent effect of age at first calving and the random effect of sire. The highest risk of being culled was found for cows at the beginningand at the end of first lactation and at the end of any other lactation; it decreased with parity and increased with low milk production. Risk of culling went down with decreasing percentage of Holstein breed.
|Oddělení||Genetika a šlechtění hospodářských zvířat|
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