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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
08/09/2009 |
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Data da última atualização: |
15/03/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CALEGARE, L.; ALENCAR, M. M. de; PACKER, I. U.; FERRELL, C. L.; LANNA, D. P. D. |
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Afiliação: |
LIANA CALEGARE, ESALQ; MAURICIO MELLO DE ALENCAR, CPPSE; IRINEU UMBERTO PACKER, ESALQ/PIRACICABA; C. L. FERRELL, ESALQ/PIRACICABA; DANTE P. D. LANNA, ESALQ/PIRACICABA. |
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Título: |
Cow/calf preweaning efficiency of Nellore and Bos taurus x Bos indicus crosses. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Journal of Animal Science, v. 87, n. 2, p. 740-747, feb. 2009. |
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DOI: |
10.2527/jas.2007-0759 |
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Idioma: |
Inglês |
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Conteúdo: |
The objectives of this study were to determine if percentage Bos taurus (0 or 50%) of the cow had an effect on ME requirements and milk production, and to compare cow/calf efficiency among 3 mating systems. Metabolizable energy requirements were estimated during a feeding trial that encompassed a gestation and lactation feeding trial for each of 2 groups of cows. Cows were 0 or 50% Bos taurus (100 or 50% Nellore) breed type: Nellore cows (NL; n = 10) mated to Nellore bulls, NL cows (n = 9) mated to Angus bulls, Angus x Nellore (ANL; n = 10) and Simmental x Nellore (SNL; n = 10) cows mated to Canchim (5/8 Charolais 3/8 Zebu) bulls. Cows were individually fed a total mixed diet that contained 11.3% CP and 2.23 Mcal of ME/kg of DM. At 14-d intervals, cows and calves were weighed and the amount of DM was adjusted to keep shrunk BW and BCS of cows constant. Beginning at 38 d of age, corn silage was available to calves ad libitum. Milk production at 42, 98, 126, and 180 d postpartum was measured using the weigh-suckle-weigh technique. At 190 d of age, calves were slaughtered and body composition estimated using 9-10-11th?rib section to obtain energy deposition. Regression of BW change on daily ME intake (MEI) was used to estimate MEI at zero BW change. Increase in percentage Bos taurus had a significant effect on daily ME requirements (Mcal/d) during pregnancy (P < 0.01) and lactation (P < 0.01). Percentage Bos taurus had a positive linear effect on maintenance requirements of pregnant (P = 0.07) and lactating (P < 0.01) cows; during pregnancy, the ME requirements were 91 and 86% of those in lactation (131 ± 3.5 vs. 145 ± 3.4 Mcal·kg?0.75·d?1) for the 0 and 50% B. taurus groups, respectively. The 50% B. taurus cows, ANL and SNL, suckling crossbred calves had greater total MEI (4,319 ± 61 Mcal; P < 0.01) than 0% B. taurus cows suckling NL (3,484 ± 86 Mcal) or ANL calves (3,600 ± 91 Mcal). The 0% B. taurus cows suckling ANL calves were more efficient (45.3 ± 1.6 g/Mcal; P = 0.03) than straightbred NL (35.1 ± 1.5 g/Mcal) and ANL or SNL pairs (41.0 ± 1.0 g/Mcal). Under the conditions of this study, crossbreeding improved cow/ calf efficiency and showed an advantage for cows that have lower energy requirements. MenosThe objectives of this study were to determine if percentage Bos taurus (0 or 50%) of the cow had an effect on ME requirements and milk production, and to compare cow/calf efficiency among 3 mating systems. Metabolizable energy requirements were estimated during a feeding trial that encompassed a gestation and lactation feeding trial for each of 2 groups of cows. Cows were 0 or 50% Bos taurus (100 or 50% Nellore) breed type: Nellore cows (NL; n = 10) mated to Nellore bulls, NL cows (n = 9) mated to Angus bulls, Angus x Nellore (ANL; n = 10) and Simmental x Nellore (SNL; n = 10) cows mated to Canchim (5/8 Charolais 3/8 Zebu) bulls. Cows were individually fed a total mixed diet that contained 11.3% CP and 2.23 Mcal of ME/kg of DM. At 14-d intervals, cows and calves were weighed and the amount of DM was adjusted to keep shrunk BW and BCS of cows constant. Beginning at 38 d of age, corn silage was available to calves ad libitum. Milk production at 42, 98, 126, and 180 d postpartum was measured using the weigh-suckle-weigh technique. At 190 d of age, calves were slaughtered and body composition estimated using 9-10-11th?rib section to obtain energy deposition. Regression of BW change on daily ME intake (MEI) was used to estimate MEI at zero BW change. Increase in percentage Bos taurus had a significant effect on daily ME requirements (Mcal/d) during pregnancy (P < 0.01) and lactation (P < 0.01). Percentage Bos taurus had a positive linear effect on maintenance requirements of pre... Mostrar Tudo |
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Palavras-Chave: |
Breed type; Energy requirement; Maintenance. |
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Thesagro: |
Bos indicus; Bos taurus; Gado de corte. |
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Thesaurus Nal: |
Milk production. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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| 2. |  | SAGRILO, E.; SAGRILO, E. (ed.). Agricultura familiar. Teresina: Embrapa Meio-Norte, 2002. 74 p. (Embrapa Meio-Norte. Sistemas de Produção, 1). Autores: Edvaldo Sagrilo, Gonçalo Moreira Ramos, Eneide Santiago Girão, Joaquim Nazário de Azevedo, Firmino José Vieira Barbosa, Raimundo Bezerra de Araújo Neto, Luiz Pinto Medeiros, Tânia Maria Leal.| Tipo: Sistema de Produção |
| Biblioteca(s): Embrapa Meio-Norte. |
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