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Title: Nitrogen, calcium and phosphorus balance of broilers fed diets with phytase and crystalline amino acids
Other Titles: Balanço de nitrogênio, cálcio e fósforo em frangos de corte recebendo dietas com fitase e aminoácidos cristalinos
Keywords: Frangos de corte - Alimentação e rações
Frangos de corte - Metabolismo
Digestão animal - Enzimas
Nutrição animal
Broilers - Feeding and feeds
Broilers - Metabolism
Animal digestion - Enzymes
Animal nutrition
Issue Date: 30-Apr-2015
Publisher: Editora da Universidade Federal de Lavras
Citation: GOMIDE, E. M. et al. Nitrogen, calcium and phosphorus balance of broilers fed diets with phytase and crystalline amino acids. Ciência e Agrotecnologia, Lavras, v. 35, n. 3, p. 591-597, maio/jun. 2011.
Abstract: The objective of this study was to evaluate the effect of reduced-crude protein (CP) and available phosphorus (aP) diets, added with phytase and amino acids for broilers in the growing (14 to 21 days old) and retirement (35 to 42 days) phases on nitrogen, potassium and phosphorus balance. Ninety Cobb broilers were distributed in a completely randomized design with three treatments and six replications with five and three birds per experimental unit in the growing and retirement phases, respectively. Diets were elaborated to contain reduced CP and aP levels (19 and 17% CP in the growing phase, with 0.34% aP; and 18 and 16% CP in the retirement phase, with 0.30% aP), supplemented with crystalline amino acids and 500 FTU of phytase/kg diet. These were compared to a control diet (21% CP and 0.46% aP for growing phase and 19% CP and 0.40% aP for retirement phase). The reduction of CP in four percentual units reduced the N excretion and increased the retention of this element, showing that the phytase had no influence on N balance when used the crystalline amino acids in the diets. The phytase reduced the P excretion and increased the retention ones. The potassium excretion decreased in reduced-CP diets, but this excessive reduction decreased the retention of this element, except in the retirement phase. It was concluded that the reduced-CP and aP diets, supplemented with phytase and amino acids, are efficient in reducing the pollutant power of the broilers excrements in the growing and retirement phases of production.
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Appears in Collections:DMV - Artigos publicados em periódicos

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