| Registro completo |
| Provedor de dados: |
Ciência e Agrotecnologia
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| País: |
Brazil
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| Título: |
Performance and carcass characteristics of swine at 50 kg fed diets with different energy levels and reduced levels of crude protein
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| Autores: |
Zangeronimo,Márcio Gilberto
Cantarelli,Vinícius de Souza
Fialho,Elias Tadeu
Amaral,Nikolas de Oliveira
Silveira,Hebert
Lima,José Augusto de Freitas
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| Data: |
2009-06-01
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| Ano: |
2009
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| Palavras-chave: |
Digestible amino acid
Synthetic lysine
Swine production
Ideal protein
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| Resumo: |
The aim of this work was to evaluate the effects of different levels of metabolic energy (ME) in diets with a reduced level of crude protein (CP) on the performance and carcass characteristics of growing swine. Thirty-two high-performance barrows (initial weight of 22.5 ± 1.43 kg and final weight of 50.81 ± 2.54 kg) were distributed in a randomized block design with four treatments (three levels of ME - 3,060, 3,230 and 3,400 kcal/kg - in diets with 14% CP, and one control treatment with 3,230 kcal ME/kg and 18% CP) and four replicates. The diets were formulated with a true digestible basis of amino acids present in the feed, with methionine and threonine concentrations corrected as a function of lysine levels. The animals were slaughtered and their carcasses were studied. The ME levels did not affect the average weight gain, the feed:gain ratio, the backfat thickness or the loin eye area. A higher carcass yield and a higher carcass meat:fat ratio were observed in the animals that received the 3,230 and 3,060 kcal/kg ME levels. Compared to the control treatment, only the 3,400 kcal/kg ME level had a lower average daily feed intake. It is concluded that the CP level in diet should be reduced from 18% to 14% and the metabolizable energy level should be increased, thus reducing the feed intake and increasing the carcass meat:fat ratio without affecting the animal weight gain.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000300034
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| Editor: |
Editora da Universidade Federal de Lavras
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| Relação: |
10.1590/S1413-70542009000300034
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| Formato: |
text/html
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| Fonte: |
Ciência e Agrotecnologia v.33 n.3 2009
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| Direitos: |
info:eu-repo/semantics/openAccess
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