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Provedor de dados:  Ciência e Agrotecnologia
País:  Brazil
Título:  Diets with reduced levels of nutrients supplemented with phytase and amino acids for broilers
Autores:  Gomide,Elisangela Minati
Rodrigues,Paulo Borges
Naves,Luciana de Paula
Bernardino,Verônica Maria Pereira
Santos,Luziane Moreira dos
Garcia,Antonio Amandio Pinto
Data:  2012-02-01
Ano:  2012
Palavras-chave:  Tibia ash
Carcass yield
Ideal protein
Resumo:  One performance experiment and another metabolism experiment were conducted simultaneously with broilers from 22 to 35 days of age, evaluating five diets in six replicates. The control diet, without phytase, contained 19% of crude protein (CP); 0.412% of available phosphorus (aP) and 0.824% of calcium (Ca). The other diets were supplemented with phytase and were formulated with 0.262% of aP and 0.524% of Ca, with the CP level ranging from 19 to 16%. In the performance assay, 750 birds were used, in which were evaluated the performance, the tibia ash content and yields of carcass, cuts, and abdominal fat at 35 days of age. The metabolism assay was conducted with 90 birds, evaluating the apparent metabolizable energy corrected by the nitrogen balance; the metabolizability coefficient of dry matter (MCDM) of the diets, and also the balance and retention of nitrogen (N) and phosphorus (P). Diets did not affect performance, tibia ash content and yields of carcass, breast and thigh + drumstick. However, birds fed diet containing 16% of CP showed greater abdominal fat. Diets containing 19% of CP had the smaller energetic value and MCDM. The retention of N and P was higher in birds fed diets formulated with reduced CP content and phytase. Therefore, when the broiler feed is supplemented with phytase and amino acids it is possible to reduce the CP, aP and Ca for up to 16; 0.262 and 0.524%, respectively.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Editora da Universidade Federal de Lavras
Relação:  10.1590/S1413-70542012000100013
Formato:  text/html
Fonte:  Ciência e Agrotecnologia v.36 n.1 2012
Direitos:  info:eu-repo/semantics/openAccess

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