Abstract
Abstract Response to superovulatory treatment was expressed as number of ova or number of transferable embryos per flush, including or excluding non-responders, and as a categorical trait with only two classes (responders/non-responders). Significant effect of breed was observed for all measures of response, with Red Danish and Danish Red & White having higher values than Danish Jersey and Danish Friesian. Variance/covariance components were estimated for effects of service sire, permanent environment (donor) and additive genotype (donor). Additive genotype did contribute significantly to the phenotypic variance of all quantitative measures of response. Heritabilities of 0.31 ± 0.06 and 0.22 ± 0.07 were found for number of ova and number of transferable embryos, respectively, when non-responders were excluded. If non-responders were included, heritabilities dropped to 0.25 ± 0.06 and 0.15 ± 0.05 for number of ova and number of transferable embryos, respectively. It is argued that systematic use of su-pero...
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