Proportional, regression and modified regression correction factors for prediction of 305-days milk and fat yield of Black-White and Holstein-Friesian cows and crosses based on short-term cumulated yields were calculated. Cumulation from 1 to 10 and from 10 to 1 month of lactation was considered. There are different correction factors for cows of different breeds and crosses and for different traits.
For estimation correction factors 21417 milk and fat lactation yields and 13164 protein yields of Black-White and holstein-friesian cows and crosses are used. Estimated factors for correction milk, fat and protein yields are related to age of cow at calving, season of calving and both. There are different correction factors for age and season of calving for different breeds and crosses and for different traits.
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