Energy and protein levels in diets containing phytase for broilers from 22 to 42 days of age: performance and nutrient excretion

Revista Brasileira de Zootecnia

Alvarenga, Renata Ribeiro¹  Zangeronimo, Márcio Gilberto¹  Rodrigues, Kênia Ferreira²  Nagata, Adriano Kaneo³  Lima, Gustavo Freire Resende⁴  Rodrigues, Paulo Borges¹ 

[1] UFLA;UFT;Tortuga CIA Zootécnica Agrária;Agroceres

关键词: addictive;    available phosphorus;    enzyme;    ideal protein;    metabolizable energy;    pollutants    Introduction Balancing diets to improve the performance and to reduce the environmental impact caused by poultry waste has been the subject of research in recent years;    isnasmuch as current systems of poultry farming are basically in total confinement and at high densities;   

DOI  :  10.1590/S1516-35982011000800014

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

This study was conducted in order to evaluate the influence of different levels of metabolizable energy and crude protein in diets formulated according to the ideal protein concept with phytase supplementation on performance and nutrient excretion of broilers from 22 to 42 days age. It was used 1,500 Coob lineage broilers at 22 days of age and with initial weight of 833 ± 7g, distributed in completely randomized design in a 3 × 3 + 1 factorial scheme composed of three levels of correct apparent metabolizable energy (2,950; 3,100 and 3,250 kcal/kg), three levels of crude protein (14, 16 and 18%) and a control treatment, totaling ten treatments with six repetitions of 25 birds each. All diets, with the exception of the control, were supplemented with phytase. For determination of excretion of pollutants, it was used 180 broilers from the same lineage at 35 days of age,placed in metabolic cages, with ten treatments each one with six repetitions and three birds per experimental unit. The protein and energy levels in diets containing phytase influenced feed intake, weight gain, feed conversion and excretion of nitrogen, phosphorus, calcium, potassium, copper and zinc by the birds. The corrected apparent metabolizable energy level in the diets for broilers in the studied period must be increased up to 3,250 kcal/kg of metabolizable energy and the levels of crude protein, calcium and phosphorus must be reduced down to 18, 0.70 and 0.31%, respectively, provided that supplemented with amino acids and phytase to improve the performance and to reduce excretion of pollutants by birds.

【 授权许可】

CC BY-NC