Genetic parameters for test-day milk yield, 305-day milk yield, and lactation length in Guzerat cows

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorSantos, D. J A
dc.creatorPeixoto, M. G C D
dc.creatorBorquis, R. R A
dc.creatorVerneque, R. S.
dc.creatorPanetto, J. C C
dc.creatorTonhati, Humberto
dc.date2014-05-27T11:28:45Z
dc.date2016-10-25T18:46:02Z
dc.date2014-05-27T11:28:45Z
dc.date2016-10-25T18:46:02Z
dc.date2013-04-01
dc.date.accessioned2017-04-06T02:18:10Z
dc.date.available2017-04-06T02:18:10Z
dc.identifierLivestock Science, v. 152, n. 2-3, p. 114-119, 2013.
dc.identifier1871-1413
dc.identifierhttp://hdl.handle.net/11449/74933
dc.identifierhttp://acervodigital.unesp.br/handle/11449/74933
dc.identifier10.1016/j.livsci.2012.12.012
dc.identifierWOS:000316525000002
dc.identifier2-s2.0-84875489727.pdf
dc.identifier2-s2.0-84875489727
dc.identifierhttp://dx.doi.org/10.1016/j.livsci.2012.12.012
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/895692
dc.descriptionMilk production in tropical environments requires the use of crossbreeding systems including breeds well adapted to harsh conditions, but with lower productivities when compared to specialized breeds. Besides the genetic improvement for milk production, lactation lengths also need to be studied for most of these breeds. Accordingly, genetic parameters were estimated for 305-day cumulative milk yield (MY305), test-day milk yield (TDMY), and lactation length (LL) using information from the first lactations of 2816 Guzerat cows selected for milk production in 28 herds in Brazil. Contemporary groups were defined as herd, year and season of the test for TDMY, and as herd, year and season of calving for MY305 and LL. Variance components were estimated with the restricted maximum likelihood method under a multi-trait animal model. Heritabilities estimated for TDMY ranged from 0.16 to 0.24, and were 0.24 and 0.12 for MY305 and LL, respectively. Genetic correlations were high and positive, ranging from 0.51 to 0.99 among TDMY records, from 0.81 to 0.98 between each TDMY and MY305, and from 0.71 to 0.94 between each TDMY and LL. Genetic parameters obtained in this study indicated the possibility of using test-day records for the prediction of breeding values for milk yield in this population of the Guzerat breed. The use of TDMY as selection criteria would result in indirect gains in MY305 and LL. However, the highest response to selection for MY305 would be obtained by direct selection for this trait. © 2012 Elsevier B.V.
dc.languageeng
dc.relationLivestock Science
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectGenetic gain
dc.subjectMilk yield
dc.subjectVariance components
dc.subjectZebu
dc.subjectAnimalia
dc.subjectBos indicus
dc.titleGenetic parameters for test-day milk yield, 305-day milk yield, and lactation length in Guzerat cows
dc.typeOtro


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