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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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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
11/07/2022 |
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Data da última atualização: |
11/07/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GOULART, R. S.; TEDESCHI, L. O.; SILVA, S. L.; LEME, P. R.; ALENCAR, M. M. de; LANNA, D. P. D. |
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Afiliação: |
RODRIGO S. GOULART, USP; LUIS O. TEDESCHI, Texas A&M University; SAULO L. SILVA, Texas A&M University; PAULO R. LEME, Texas A&M University; MAURICIO MELLO DE ALENCAR, CPPSE; DANTE P. D. LANNA, USP-ESALQ. |
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Título: |
The energy requirement for maintenance of Nellore crossbreds in tropical conditions during the fnishing period. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Journal of Animal Science, v.100, p.1-12, apr. 2022. |
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DOI: |
https://doi.org/10.1093/jas/skac125 |
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Idioma: |
Inglês |
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Conteúdo: |
This study determined the energy requirement for maintenance of purebred Nellore cattle and its crossbreds using data from a comparative slaughter trial in which animals were raised under the same plane of nutrition from birth through slaughter and born from a single commercial Nellore cowherd. A total of 79 castrated steers (361 ± 54 kg initial body weight [BW]) were used in a completely randomized design by age (22 mo ± 23 d of age) with four genetic groups (GG): Nellore (NL), 1?2 Angus × 1?2 Nellore (AN), 1?2 Canchim × 1?2 Nellore (CN), and 1?2 Simmental × 1?2 Nellore (SN). The experimental design provided ranges in metabolizable energy (ME) intake (MEI), BW, and average daily gain needed to develop regression equations to predict net energy for maintenance (NEm) requirements. Four steers of each GG were slaughtered to determine the initial body composition. The remaining 63 steers were assigned to different nutritional treatments (NT) by GG; ad libitum or limit-fed treatments (receiving 70% of the daily feed of the ad libitum treatment of the same GG). Full BW was recorded at birth, weaning, 12, 18, and 22 mo. In the feedlot, steers were fed for 101 d a diet containing (DM basis) 60% corn silage and 40% concentrate. No difference in age at weaning (P = 0.534) and slaughter (P = 0.179 and P = 0.896, for GG and NT, respectively) were observed. AN steers were heavier at weaning weight, yearling weight and had higher empty BW (EBW; P = 0.007, P = 0.014, and P < 0.001, respectively) in comparison to NL, CN, and SN. There were no interactions (P > 0.05) between GG and NT for any variable evaluated. When fed ad libitum, AN steers had higher daily MEI (Mcal/d; P < 0.001) in comparison to NL, CN, and SN. On a constant age basis, differences were observed on body composition (P < 0.05) between GG. The slope (P = 0.600) and intercept (P = 0.702) of the regression of log heat production on MEI were similar among GG. Evaluating at the same age and the same frame size, there were no differences in NEm requirement between Nellore and AN (P = 0.528), CN (P = 0.671), and SN (P = 0.706). The combined data indicated a NEm requirement of 86.8 kcal/d/kg0.75 EBW and a ME required for maintenance requirement had a common value of 137.53 kcal/d/kg0.75 EBW. The effciency of energy utilization for maintenance and the effciency of energy utilization for growth values were similar among GG (P > 0.05 and P > 0.05, respectively) and were on average 63.2% and 26.0%, respectively. However, although not statistically different, the NEm values from NL showed a decrease in NEm of 5.76% compared with AN steers. MenosThis study determined the energy requirement for maintenance of purebred Nellore cattle and its crossbreds using data from a comparative slaughter trial in which animals were raised under the same plane of nutrition from birth through slaughter and born from a single commercial Nellore cowherd. A total of 79 castrated steers (361 ± 54 kg initial body weight [BW]) were used in a completely randomized design by age (22 mo ± 23 d of age) with four genetic groups (GG): Nellore (NL), 1?2 Angus × 1?2 Nellore (AN), 1?2 Canchim × 1?2 Nellore (CN), and 1?2 Simmental × 1?2 Nellore (SN). The experimental design provided ranges in metabolizable energy (ME) intake (MEI), BW, and average daily gain needed to develop regression equations to predict net energy for maintenance (NEm) requirements. Four steers of each GG were slaughtered to determine the initial body composition. The remaining 63 steers were assigned to different nutritional treatments (NT) by GG; ad libitum or limit-fed treatments (receiving 70% of the daily feed of the ad libitum treatment of the same GG). Full BW was recorded at birth, weaning, 12, 18, and 22 mo. In the feedlot, steers were fed for 101 d a diet containing (DM basis) 60% corn silage and 40% concentrate. No difference in age at weaning (P = 0.534) and slaughter (P = 0.179 and P = 0.896, for GG and NT, respectively) were observed. AN steers were heavier at weaning weight, yearling weight and had higher empty BW (EBW; P = 0.007, P = 0.014, and P < 0.001, respec... Mostrar Tudo |
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Palavras-Chave: |
Comparative slaughter; Effciency; Growth curve; Net energy. |
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Thesagro: |
Bos Indicus. |
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Thesaurus Nal: |
Weaning weight. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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| 3. |  | COUTINHO, W. M.; SUASSUNA, N. D. Enfermedades del Ricino In: SEVERINO, L. S.; MILANI, M.; BELTRÃO, N. E. de M. Ricino : el productor pregunta, la Embrapa responde. Brasília, DF : Embrapa Información Tecnológica, 2007. p. 107-141 (Colección 500 preguntas, 500 respuestas).| Tipo: Capítulo em Livro Técnico-Científico | Circulação/Nível: -- - -- |
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| 11. | | SILVA, O. R. R. F.; COUTINHO, W. M. Os Resíduos do Sisal. In: BORRÁS, V. A.; SAVASTANO JUNIOR, S.; ARJONA, S. D.; RAMIREZ, A. M. (Ed.). Aprovechiamento de residuos agro-industriales como fuente sostenible de materiales de construcción. Espanha : Universitat Politécnica de València, 2011. p. 161-170| Tipo: Capítulo em Livro Técnico-Científico |
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| Registros recuperados : 86 | |
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