Data/hora: 07/06/2024 08:28:02

Biblioteca(s): | Embrapa Gado de Leite.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | B - 1
Data corrente: | 09/12/2016
Data da última atualização: | 30/01/2023
Autoria: | RODRIGUES, J. P. P.; LIMA, J. C. M.; CASTRO, M. M. D.; VALADARES FILHO, S. de C.; CAMPOS, M. M.; CHIZOTTI, M. L.; MARCONDES, M. I.
Afiliação: | João Paulo Pacheco Rodrigues, UFV; Jessika Carolina Moutinho Lima, UFV; Marcelo Messias Duarte Castro, UFV; Sebastião de Campos Valadares Filho, UFV; MARIANA MAGALHAES CAMPOS, CNPGL; Mário Luiz Chizzotti, UFV; Marcos Inácio Marcondes, UFV.
Título: | Energy and protein requirements of young Holstein calves in tropical condition.
Ano de publicação: | 2016
Fonte/Imprenta: | Tropical Animal Health and Production, n. 48, p. 1387-1394, 2016.
Idioma: | Inglês
Conteúdo: | 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 (km) of 59.4 %. The equation obtained to estimate the net requirement of energy for gain (NEg; MJ/d) was 4.40 × EBW0.099, with the efficiency of utilization of energy for gain (kg) 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 BW0.75, respectively. The efficiency of use of metabolizable protein for maintenance (kpm) 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 protein.
Thesaurus Nal: | Dairy calves; Holstein; metabolizable energy; Slaughter.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/151547/1/Cnpgl-2016-TropAnimHealthProd-Energy.pdf
Registro original: | Embrapa Gado de Leite (CNPGL)
Exemplares: | CNPGL - (22990-1) - UPC - AP - DD -  -  -  - DIS