Energy and protein requirements of young Holstein calves in tropical condition

dc.creatorRodrigues, João Paulo Pacheco
dc.creatorLima, Jessika Carolina Moutinho
dc.creatorCastro, Marcelo Messias Duarte
dc.creatorValadares Filho, Sebastião de Campos
dc.creatorCampos, Mariana Magalhães
dc.creatorChizzotti, Mário Luiz
dc.creatorMarcondes, Marcos Inácio
dc.date2018-05-09T11:28:04Z
dc.date2018-05-09T11:28:04Z
dc.date2016-06-27
dc.date.accessioned2023-09-27T21:12:41Z
dc.date.available2023-09-27T21:12:41Z
dc.identifier15737438
dc.identifierhttp://dx.doi.org/10.1007/s11250-016-1102-x
dc.identifierhttp://www.locus.ufv.br/handle/123456789/19405
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8956609
dc.descriptionOur 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.
dc.formatpdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherTropical Animal Health and Production
dc.relationv. 48, n. 7, p. 1387–1394, Outubro 2016
dc.rightsSpringer Science+Business Media Dordrecht
dc.subjectComparative slaughter
dc.subjectEfficiency of utilization
dc.subjectGrowth
dc.subjectMaintenance
dc.subjectMetabolizable energy
dc.subjectMetabolizable protein
dc.titleEnergy and protein requirements of young Holstein calves in tropical condition
dc.typeArtigo


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