Increasing levels of phytase in diets formulated with reduced available phosphorus content supplied to male and female broilers

Ciência Rural

Luciana De Paula Naves¹  Paulo Borges Rodrigues¹  Levy Do Vale Teixeira¹  Antônio Gilberto Bertechini¹  Renata Ribeiro Alvarenga¹  Verônica Maria Pereira Bernardino¹  Luziane Moreira Dos Santos¹  Yuri Pereira Efrem Natividade¹ 

关键词: aviculture;    bone ash;    enzyme;    metabolism;    performance;    phytate;    avicultura;    cinza óssea;    desempenho;    enzima;    fitato;    metabolismo;   

DOI  :  10.1590/0103-8478cr20130493

来源: SciELO

【 摘 要 】

The reduction of the available phosphorus (avP) content in the broiler diet must be followed by the supplementation of adequate phytase. One experiment was conducted with broilers from 15 to 28 days of age to determine the level of necessary phytase when the mashed diet is formulated with 0.213% of avP to enable the results of performance, tibia ash content, and calcium (Ca) utilization similar to those determined for birds fed with diet formulated to meet their nutritional requirements. Thus, 120 broilers were distributed in (4+1) x2 factorial arrangement corresponding to four deficient diets in avP (0.213%) supplemented with phytase (0; 750; 1,500 or 2,250FTU kg-1) plus one positive control diet without phytase (0.426% of avP), supplied to male and female broilers. Males showed better performance and higher totalP retention. Decrease in the avP content of the diet without phytase use worsened the performance, tibia ash content, and Ca retention; however, these parameters were improved gradually with the increase of the phytase level in the diet. Regardless of sex, using 2,250FTU kg-1, it is possible to reduce the avP to 0.213% without impairing performance, tibia ash content, and Ca retention; in addition to reducing the totalP excretion in 56.75% and improving its utilization in 38.58%.

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