Tonhati, Humberto [UNESP]Lôbo, R. B.Oliveira, H. N. [UNESP]2014-05-272014-05-271999-04-15Theriogenology, v. 51, n. 6, p. 1151-1156, 1999.0093-691Xhttp://hdl.handle.net/11449/65760The objective of this study was to estimate the relative effects of genetic and phenotypic factors on the efficacy and efficiency of superovulation for Holstein-Friesian cows reared in Brazil. A database, established by the Associacao Brasileira de Criadores de Bovinos da Raca Holandesa, consisting of a total of 5387 superovulations of 2941 cows distributed over 473 herds and sired by 690 bulls was used for the analysis. The records were analyzed by MTDFREML (Multiple Trait Derivative-Free Restricted Maximum Likelihood), using a repeatability animal model. The fixed effects included in the model were contemporaneous group (veterinarian, herd, year and season of the superovulation); number of semen doses; cow age; and superovulation order. The estimated repeatability of the number of the transferable embryos was low (0.13), and the estimated heritability was 0.03. These results indicate that environmental factors play a critical role in the response of a cow to a superovulation treatment. There is little evidence that future responses to superovulation by individual females can be predicted by previous treatment(s) or that superovulation response is an heritable trait.1151-1156engGenetic aspectsHolstein-FriesianYield embryosaginganimalanimal diseaseartificial inseminationcattlecowdata analysisdata baseembryo transferenvironmentenvironmental factorfemalegeneticsheritabilitynonhumanphysiologyreproducibilityseasonsuperovulationAgingAnimalsCattleEmbryo TransferEnvironmentFemaleInsemination, ArtificialReproducibility of ResultsSeasonsSuperovulationAnimaliaBos taurusFriesiaArtigo10.1016/S0093-691X(99)80018-1WOS:000080581400010Acesso restrito2-s2.0-034572988274452549608581595593441035110683