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도창희(Chang Hee Do),전광주(Gwang Ju Jeon),이학교(Hak Gyo Lee),이정규(Jung Gyu Lee) 한국축산학회 1994 한국축산학회지 Vol.36 No.5
Herd, calving year and season have relatively highly variable effects on milk production traits of dairy cattle and seem to be suitable with the characteristics of random effect. For a statistical approach to estimate these effects, computational ease in estimating fixed contemporary group effects and accuracy in estimating random contemporary group effects for small numbers of observations in groups should be compared. For a genetic evaluation with small herd sizes and the relatively small registered and tested dairy cattle population in Korea. the contemporary group effects should be treated as random and the flexible grouping strategy insuring maximization of homogeneiety in subgroups would be a proper choice, because of accurate prediction of additive genetic effect is and less of a loss of information from records.