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dc.contributor.authorRodrigues, João Paulo Pacheco
dc.contributor.authorLima, Jessika Carolina Moutinho
dc.contributor.authorCastro, Marcelo Messias Duarte
dc.contributor.authorValadares Filho, Sebastião de Campos
dc.contributor.authorCampos, Mariana Magalhães
dc.contributor.authorChizzotti, Mário Luiz
dc.contributor.authorMarcondes, Marcos Inácio
dc.date.accessioned2018-05-09T11:28:04Z
dc.date.available2018-05-09T11:28:04Z
dc.date.issued2016-06-27
dc.identifier.issn15737438
dc.identifier.urihttp://dx.doi.org/10.1007/s11250-016-1102-x
dc.identifier.urihttp://www.locus.ufv.br/handle/123456789/19405
dc.description.abstractOur objective was to estimate the energy and protein requirements of Holstein young calves up to 87 days old. Forty-two Holstein calves aged 4 days were used. From these, ten were randomly selected and slaughtered to compose the baseline slaughter (BS) group. The remaining calves were randomly assigned to eight treatments in a 4 × 2 factorial using a completely randomized design. The treatments were 2, 4, 6, and 8 kg/day of milk (297 g/kg CP; 319 g/kg of fat) fed twice daily, and then harvested at 59 or 87 days of age. Calves were fed a starter (193 g/kg CP; 133 g/kg NDF) ad libitum in all treatments. The calves slaughtered at 87 days of age had milk replaced by Coast-cross (Cynodoon sp.) hay (125 g/kg CP; 728 g/kg NDF). The net requirement of energy for maintenance (NEm) was 0.36 MJ/kg EBWG, with efficiency of utilization of energy for maintenance (k m) of 59.4 %. The equation obtained to estimate the net requirement of energy for gain (NEg; MJ/d) was 4.40 × EBW^0.099, with the efficiency of utilization of energy for gain (k g) equal to 46.5 %. The observed requirements of net and metabolizable protein for maintenance (NPm and MPm) were 3.67 and 3.88 g/kg BW^0.75, respectively. The efficiency of use of metabolizable protein for maintenance (k pm ) was 94.6 %. The predicted requirements were higher than those observed in the literature, and this study demonstrated that the requirements of newborn calves are higher than the recommended.en
dc.formatpdfpt-BR
dc.language.isoengpt-BR
dc.publisherTropical Animal Health and Productionpt-BR
dc.relation.ispartofseriesv. 48, n. 7, p. 1387–1394, Outubro 2016pt-BR
dc.rightsSpringer Science+Business Media Dordrechtpt-BR
dc.subjectComparative slaughterpt-BR
dc.subjectEfficiency of utilizationpt-BR
dc.subjectGrowthpt-BR
dc.subjectMaintenancept-BR
dc.subjectMetabolizable energypt-BR
dc.subjectMetabolizable proteinpt-BR
dc.titleEnergy and protein requirements of young Holstein calves in tropical conditionen
dc.typeArtigopt-BR
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