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dc.contributor.authorDaltro, Darlene dos Santospt_BR
dc.contributor.authorPadilha, Alessandro Haiduckpt_BR
dc.contributor.authorGama, Luís Telo dapt_BR
dc.contributor.authorSilva, Marcos Vinicius Gualberto Barbosapt_BR
dc.contributor.authorPanetto, João Cláudio do Carmopt_BR
dc.contributor.authorMachado, Juliana Dementshukpt_BR
dc.contributor.authorBraccini Neto, Josépt_BR
dc.contributor.authorCobuci, Jaime Araújopt_BR
dc.date.accessioned2019-11-23T04:05:44Zpt_BR
dc.date.issued2019pt_BR
dc.identifier.issn1594-4077pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/201998pt_BR
dc.description.abstractThe objective of this study was to evaluate the effect of heterosis on the lactation curve components of Girolando cattle obtained by fitting different mathematical models. Data consisted of 258,891 test day milk yield records of the first lactation from 37,965 cows of Minas Gerais State (Brazil) between 1998 and 2014. Those cows were from the Holstein breed (H), Gyr breed (G) and six genetic cross-breedings of Holstein Gyr, (1/4H, 3/4G (1/4H); 3/8H, 5/8G (3/8H); 1/2H, 1/ 2G (1/2H), 5/8H, 3/8G (5/8H); 3/4H, 1/4G (3/4H); 7/8H, 1/8G (7/8H)), which is officially named as Girolando breed in Brazil. The Wood’s linear model (WDlin), Wood’s non-linear model (WDnlin), Wilmink’s model (WL) and Ali and Schaeffer’s model (ASH) were used for estimating the peak milk yield (PY), time to peak yield (PT), 305-day milk yield (TMY) and four different persistency measures (P, P2:1, P3:1 and P3:2). Regardless of the fitted model, the highest estimates of PY and TMY were for the H group. The heterosis effect was significant (p < .001) for TMY and all components of the lactation curve, except for P2:1. Girolando cattle presented a heterosis effect of 12.30% and 13.03% for PY and TMY, respectively. The magnitude of heterosis effect was larger for PT (24.18%), whereas the different persistency measures presented the smallest magnitude of heterosis values. The producers may use the different genetic groups to benefit from the heterosis mainly for the time to peak, peak yield and 305-day milk yield.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofItalian Journal of Animal Science. Pavia. Vol 18, no. 1 (2019), p. 267-278pt_BR
dc.rightsOpen Accessen
dc.subjectCross-breedingen
dc.subjectVigor hibridopt_BR
dc.subjectDairy cowsen
dc.subjectLactaçãopt_BR
dc.subjectMathematical modelen
dc.subjectVaca leiteirapt_BR
dc.subjectPersistency of lactationen
dc.subjectModelo matemáticopt_BR
dc.subjectCurva de Lactaçãopt_BR
dc.subjectCruzamento animalpt_BR
dc.titleHeterosis in the components of lactation curves of Girolando cowspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001099909pt_BR
dc.type.originEstrangeiropt_BR


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