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Direct and maternal additive genetic and mitochondrial variances of duck meat performancetraits were estimated using AI-REML algorithm. Records of 3 099 (5 010 pedigreed birds) fromsix consecutive generations were included. The following four traits were investigated: bodyweight at 3rd week, body weight at 7th week, sternum crest length at 7th week (in cm), andbreast muscles thickness at 7th week (in cm). The data were analysed via three single traitlinear animal models: I – additive genetic model, II – model extended to additive maternaleffects; III– as model II with mitochondrial effects as random. Adequacy of the models wasexamined by Akaike´s information criterion (AIC). Relatively high direct additive heritabilityestimates were obtained for body weight at 3rd week (0.4326–0.4546) and body weight at7th week (0.5322–0.6088) whereas lower estimates were obtained for sternum crest length(0.1756–0.2744) and breast muscles thickness (0.1369–0.2932). The maternal heritabilities weremoderate and also considerably depended on the model used. For all of the studied traits anegative covariance between direct and maternal genetic effects was found. Mitochondrialheritabilities were very low. Generally, on the basis of criteria employed, the model III can besuggested for analysis of body weight whereas for other traits model II seems to be suitable

Maternal genetic effects on body weight and breast morphological traits in duck population under selection