Genetic parameters for milk yield analyzed by test-day models in Murrah buffaloes in Brazil

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorAspilcueta-Borquis, Rusbel R.
dc.creatorBignardi, Annaiza B.
dc.creatorSeno, Leonardo de O.
dc.creatorCamargo, Gregorio M. F. de
dc.creatorMunoz-Berrocal, Milthon H.
dc.creatorAlbuquerque, Lucia Galvão de
dc.creatorDi Palo, Rossella
dc.creatorTonhati, Humberto
dc.date2014-05-20T13:19:10Z
dc.date2014-05-20T13:19:10Z
dc.date2010-01-01
dc.date.accessioned2017-04-05T19:44:05Z
dc.date.available2017-04-05T19:44:05Z
dc.identifierItalian Journal of Animal Science. Pavia: Pagepress Publ, v. 9, n. 2, p. 179-182, 2010.
dc.identifier1594-4077
dc.identifierhttp://hdl.handle.net/11449/4949
dc.identifier10.4081/ijas.2010.e34
dc.identifierWOS:000282633500007
dc.identifierWOS000282633500007.pdf
dc.identifierhttp://dx.doi.org/10.4081/ijas.2010.e34
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/854147
dc.descriptionNew statistical models for genetic parameters estimation based on longitudinal data have been proposed. In this study, we considered the data of 47,614 test-day milk yields from 1,578 buffaloes, with 4,757 complete lactations, calving from 1985 to 2006. Single- ,two-and multiple trait analyses were used and variance components were estimated by Restricted Maximum Likelihood. The model used to evaluate the milk yield trait at 305 days (MY305) included: i) herd-year-calving season (contemporary group) and milking number as fixed effects; ii) buffalo age at calving as covariate (linear and quadratic effect); iii) additive genetic, permanent environmental, residual and the animal as random effects. The same effects were included in the test-day milk yield model except the contemporary group, defined as herd-year-test day. The heritability estimations for TDMY vary from 0.13 to 0.23 for single-trait analyses, from 0.13 to 0.24 for two-trait analyses and from 0.15 to 0.24 for the multiple-trait analyses. The results obtained for each of the three models showed that the higher heritability estimations were always obtained in the third test month. The genetic correlations between the TDMY and MY305 were high and positive. In conclusion, the TDMY trait use into the selective process will promote genetic changes similar to the ones obtained through the MY305.
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageeng
dc.publisherPagepress Publ
dc.relationItalian Journal of Animal Science
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectStatistical models
dc.subjectGenetic parameter
dc.subjectLongitudinal data
dc.subjectBubalus bubalis
dc.subjectMilk production
dc.titleGenetic parameters for milk yield analyzed by test-day models in Murrah buffaloes in Brazil
dc.typeOtro


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