Early imprinting in wild and game-farm mallards (Anas platyrhynchos): Genotype and arousal

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Early imprinting (beginning approximately 20 hrs posthatch) was studied under laboratory conditions in 5 lines of mallard ducks with different degrees of wildness obtained through pedigreed breeding. Data were analyzed by the least squares method. Wild Ss imprinted better than game-farm (domesticated) Ss, and heterosis was demonstrated to exist in imprinting traits. Nonadditive genetic variations and genotype-environmental interactions are discussed as possible causes for the heterosis observed. Differences in imprinting between genetic lines are attributed, at least partly, to differences in arousal level during the Ss' 1st exposure to the imprinting stimulus. (40 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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