Data/hora: 10/06/2024 00:57:17

Provedor de dados: | 64
País: | Brazil
Título: | Performance and carcass characteristics of swine at 50 kg fed diets with different energy levels and reduced levels of crude protein
Autores: | Zangeronimo,Márcio Gilberto; Cantarelli,Vinícius de Souza; Fialho,Elias Tadeu; Amaral,Nikolas de Oliveira; Silveira,Hebert; Lima,José Augusto de Freitas.
Data: | 2009-06-01
Ano: | 2009
Palavras-chave: | Digestible amino acid; Synthetic lysine; Swine production; Ideal protein.
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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000300034
Editor: | Editora da Universidade Federal de Lavras
Relação: | 10.1590/S1413-70542009000300034
Formato: | text/html
Fonte: | Ciência e Agrotecnologia  v.33 n.3 2009
Fonte: | info:eu-repo/semantics/openAccess