Factors associated with 56-day non-return rate in dairy cattle.

dc.contributorAfricor Lugo, Ronda de Fingoi; Africor Lugo, Ronda de Fingoi; Universidade de Santiago de Compostela (USC), Facultade de Veterinaria de Lugo; Universidade de Santiago de Compostela (USC), Facultade de Veterinaria de Lugo; USC, Facultade de Veterinaria de Lugo.
dc.creatorFOUZ, R.
dc.creatorGANDOY, F.
dc.creatorSANJUÁN, M. L.
dc.creatorYUS, E.
dc.creatorDIÉGUEZ, F. J.
dc.date2011
dc.date2011-09-29
dc.date.accessioned2017-03-06T20:04:06Z
dc.date.available2017-03-06T20:04:06Z
dc.identifier51611
dc.identifierhttp://www.alice.cnptia.embrapa.br/handle/doc/901781
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/282678
dc.descriptionThe objective of this work was to identify factors associated with the 56-day non-return rate (56-NRR) in dairy herds in the Galician region, Spain, and to estimate it for individual Holstein bulls. The experiment was carried out in herds originated from North-West Spain, from September 2008 to August 2009. Data of the 76,440 first inseminations performed during this period were gathered. Candidate factors were tested for their association with the 56-NRR by using a logistic model (binomial). Afterwards, 37 sires with a minimum of 150 first performed inseminations were individually evaluated. Logistic regression found four major factors associated with 56-NRR in lactating cows: age at insemination, days from calving to insemination, milk production level at the time of insemination, and herd size. First-service conception rate, when a particular sire was used, was higher for heifers (0.71) than for lactating cows (0.52). Non-return rates were highly variable among bulls. A significant part of the herd-level variation of 56-NRR of Holstein cattle seems attributable to the service sire. 56-NRR.
dc.description2011
dc.languageen
dc.publisherPesquisa Agropecuária Brasileira. Brasília, v.46, n.6, p. 648-654, jun. 2011
dc.relationÁrea de Informação da Sede - Artigo em periódico indexado (ALICE)
dc.subjectDairy cattle
dc.subjectLogistic models
dc.subjectReproductive performance
dc.subjectSire influence
dc.titleFactors associated with 56-day non-return rate in dairy cattle.
dc.typeArtículos de revistas


Este ítem pertenece a la siguiente institución