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| Provedor de dados: |
Animal Sciences
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| País: |
Brazil
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| Título: |
Requirement of energy and protein of beef cattle on tropical pasture - doi: 10.4025/actascianimsci.v35i4.21143
Requirement of energy and protein of beef cattle on tropical pasture - doi: 10.4025/actascianimsci.v35i4.21143
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| Autores: |
Valente, Eriton Egidio Lisboa; Universidade Estadual do Oeste do Paraná
Paulino, Mário Fonseca; Universidade Federal de Viçosa
Detmann, Edenio; Universidade Federal de Viçosa
Valadares Filho, Sebastião de Campos; Universidade Federal de Viçosa
Cardenas, Javier Enrique Garces; Universidade Federal de Viçosa
Dias, Isabela Fernanda Teixeira; Universidade Federal de Viçosa
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| Data: |
2013-07-12
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| Ano: |
2013
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| Palavras-chave: |
5.04.03.01-0 grazing
Nellore
Supplementation Beef cattle
Grazing
Nellore
Supplementation
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| Resumo: |
Protein and energy requirements of beef cattle, aged between 4 and 18 months old, on tropical pastures, were estimated. Forty-six Nellore calves (138.3 ± 3.4 kg BW and 90-150 days old), kept on pasture, were distributed in a maintenance group (restricted feeding) or in nutritional plans, receiving a supplements with different amounts of protein and carbohydrate or non-supplemented. The net energy requirement for weight gain (NEg) was obtained by linear regression of logarithm of retained energy as a function of logarithm of empty body weight gain. The net energy requirement for maintenance (NEm) was estimated by the exponential relation between heat production and metabolizable energy intake. Net protein requirement for weight gain (RP) was estimated by multiple linear regression of retained protein in the weight gain of empty body (EBWG) and retained energy. The efficiency of metabolizable energy (ME) used for maintenance and for weight gain was 0.55 and 0.26, respectively. The ME requirement for maintenance was 124 kcal EBW-0.75. RP decreased in proportion to body weight increase. NEg and RP may be obtained by equations: RE (Mcal kg-1) = 0.044 x EBW0.75 x EBWG1.1302 and RP (g day-1) = -31.45 + 229.69 x EBWG – 8.75 x RE, respectively.
Protein and energy requirements of beef cattle, aged between 4 and 18 months old, on tropicalpastures, were estimated. Forty-six Nellore calves (138.3 ± 3.4 kg BW and 90-150 days old), kept on pasture,were distributed in a maintenance group (restricted feeding) or in nutritional plans, receiving a supplements withdifferent amounts of protein and carbohydrate or non-supplemented. The net energy requirement for weightgain (NEg) was obtained by linear regression of logarithm of retained energy as a function of logarithm of emptybody weight gain. The net energy requirement for maintenance (NEm) was estimated by the exponential relationbetween heat production and metabolizable energy intake. Net protein requirement for weight gain (RP) wasestimated by multiple linear regression of retained protein in the weight gain of empty body (EBWG) andretained energy. The efficiency of metabolizable energy (ME) used for maintenance and for weight gain was 0.55and 0.26, respectively. The ME requirement for maintenance was 124 kcal EBW-0.75. RP decreased in proportionto body weight increase. NEg and RP may be obtained by equations: RE (Mcal kg-1) = 0.044 x EBW0.75 xEBWG1.1302 and RP (g day-1) = -31.45 + 229.69 x EBWG – 8.75 x RE, respectively.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Português
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| Identificador: |
http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/21143
10.4025/actascianimsci.v35i4.21143
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| Editor: |
Editora da Universidade Estadual de Maringá
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| Relação: |
http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/21143/pdf
http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/21143/pdf_1
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| Formato: |
application/pdf
application/pdf
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| Fonte: |
Acta Scientiarum. Animal Sciences; v. 35, n. 4 (2013); 417-424
Acta Scientiarum. Animal Sciences; v. 35, n. 4 (2013); 417-424
1807-8672
1806-2636
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| Direitos: |
DECLARATION OF ORIGINALITY AND CESSATION OF COPYRIGHTI Declare that current article is original and has not been submitted for publication, in part or in whole, to any other national or international journal. I also declare that once published in the Acta Scientiarum. Animal Sciences, a publication of the Universidade Estadual de Maringá, it will not be submitted by me or by any co-author to any scientific communication mean. In my name and in the name of co-authors, I shall cede the copyright of the above mentioned article to the Universidade Estadual de Maringá and I declare that I know that the non-observance of this norm may make me liable for the penalties contemplated in the Law for the Protection of Authors’ Rights (Act 9609 of the 19th February 1998).
DECLARAÇÃO DE ORIGINALIDADE E CESSÃO DE DIREITOS AUTORAIS Declaro que o presente artigo é original, não tendo sido submetido à publicação em qualquer outro periódico nacional ou internacional, quer seja em parte ou em sua totalidade. Declaro, ainda, que uma vez publicado na revista Acta Scientiarum. Animal Sciences, editada pela Universidade Estadual de Maringá, o mesmo jamais será submetido por mim ou por qualquer um dos demais co-autores a qualquer outro meio de divulgação científica. Através deste instrumento, em meu nome e em nome dos demais co-autores, porventura existentes, cedo os direitos autorais do referido artigo à Universidade Estadual de Maringá e declaro estar ciente de que a não observância deste compromisso submeterá o infrator a sanções e penas previstas na Lei de Proteção de Direitos Autorias (Nº9609, de 19/02/98).
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