Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/19405
Tipo: Artigo
Título: Energy and protein requirements of young Holstein calves in tropical condition
Autor(es): Rodrigues, João Paulo Pacheco
Lima, Jessika Carolina Moutinho
Castro, Marcelo Messias Duarte
Valadares Filho, Sebastião de Campos
Campos, Mariana Magalhães
Chizzotti, Mário Luiz
Marcondes, Marcos Inácio
Abstract: Our 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.
Palavras-chave: Comparative slaughter
Efficiency of utilization
Growth
Maintenance
Metabolizable energy
Metabolizable protein
Editor: Tropical Animal Health and Production
Tipo de Acesso: Springer Science+Business Media Dordrecht
URI: http://dx.doi.org/10.1007/s11250-016-1102-x
http://www.locus.ufv.br/handle/123456789/19405
Data do documento: 27-Jun-2016
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