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Title: Rações com níveis reduzidos de proteína bruta, cálcio e fósforo com fitase e aminoácidos para frangos de corte
Other Titles: Diets with reduced crude protein, calcium and phosphorus levels with phytase and amino acids for broiler chickens
Keywords: Cinzas na tíbia
Tibia ashes
Issue Date: Nov-2011
Publisher: Sociedade Brasileira de Zootecnia
Citation: GOMIDE, E. M. et al. Rações com níveis reduzidos de proteína bruta, cálcio e fósforo com fitase e aminoácidos para frangos de corte. Revista Brasileira de Zootecnia, Viçosa, MG, v. 40, n. 11, nov. 2011.
Abstract: In performance and metabolism trials, diets with reduced levels of crude protein, calcium and available phosphorus on the performance, carcass characteristics, tibia ashes, balance and retention of nitrogen and phosphorus of broiler chickens in phase from 8 to 21 and 8 to 35 days were evaluated. In each phase, 30 and 25 birds per experimental unit were used in the performance assay and five and three in the metabolism assay, respectively, in a completely randomized experimental design, with six replications. Treatments consisted of diet with 21% crude protein without phytase (control), formulated with nutritional levels recommended on the Brazilian tables, and diets with 21, 20, 19 and 18% crude protein with phytase (8 to 21 days) and from 8 to 35 days, the control diet had 20% crude protein without phytase (control), and others diets with 20, 19, 18, 17% crude protein, with phytase. In the diets with phytase (80 g of Ronozyme NP(M) phytase per ton of diet), the level of available phosphorus was reduced in 0.15 and the calcium in 0.30 percentage points in relation to the control diet. No effect was observed with the reduction of nutrients on feed intake, weight gain, or feed conversion in either phase or for the study of carcass characteristics to the 35 days. However, higher abdominal fat percentage was observed when the broilers were fed diet with lower protein level. The excretion of nitrogen and phosphorus decreased when birds received diets with reduced levels of these nutrients. Ash percentage in the tibia was not influenced by treatments. It is possible to reduce protein level, available phosphorus, and calcium of the diets in up to 3, 0.15 and 0.30 percentage points when the diets are supplemented with phytase and amino acids, respectively.
Appears in Collections:DZO - Artigos publicados em periódicos

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