Mostrar registro simples

dc.contributor.authorCobuci, Jaime Araújopt_BR
dc.contributor.authorCosta, Claudio Napolispt_BR
dc.date.accessioned2014-07-23T02:07:54Zpt_BR
dc.date.issued2012pt_BR
dc.identifier.issn1516-3598pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/98474pt_BR
dc.description.abstractMilk yield test-day records on the first three lactations of 25,500 Holstein cows were used to estimate genetic parameters and predict breeding values for nine measures of persistency and 305-d milk yield in a random regression animal model using two criteria to define the fixed regression. Legendre polynomials of fourth and fifth orders were used to model the fixed and random regressions of lactation curves. The fixed regressions were adjusted for average milk yield on populations (single) or subpopulations (multiple) formed by cows that calved at the same age and in the same season. Akaike Information (AIC) and Bayesian Information (BIC) criteria indicated that models with multiple regression lactation curves had the best fit to test-day milk records of first lactations, while models with a single regression curve had the best fit for the second and third lactations. Heritability and genetic correlation estimates between persistency and milk yield differed significantly depending on the lactation order and the measures of persistency used. These parameters did not differ significantly depending on the criteria used for defining the fixed regressions for lactation curves. In general, the heritability estimates were higher for first (0.07 to 0.43), followed by the second (0.08 to 0.21) and third (0.04 to 0.10) lactation. The rank of sires resulting from the processes of genetic evaluation for milk yield or persistency using random regression models differed according to the criteria used for determining the fixed regression of lactation curve.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofRevista brasileira de zootecnia= Brazilian journal of animal science [recurso eletrônico]. Viçosa, MG. Vol. 41, n. 9 (set. 2012), p. 1996-2004pt_BR
dc.rightsOpen Accessen
dc.subjectBreeding valueen
dc.subjectGado leiteiropt_BR
dc.subjectGenética animalpt_BR
dc.subjectLegendre polynomialen
dc.subjectSelectionen
dc.subjectMelhoramento genetico animalpt_BR
dc.subjectTest-day milk yielden
dc.titlePersistency of lactation using random regression models and different fixed regression modeling approachespt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000899846pt_BR
dc.type.originNacionalpt_BR


Thumbnail
   

Este item está licenciado na Creative Commons License

Mostrar registro simples