PHYTASE ADDITION TO DIETS WITH DIFFERENT LEVELS OF METABOLIZABLE ENERGY, CRUDE PROTEIN AND AVAILABLE PHOSPHORUS TO BROILERS FROM 1 TO 21 DAYS OF AGE

Authors

  • Renata Ribeiro Alvarenga Universidade Federal de Lavras (UFLA), Lavras, Minas Gerais, Brasil
  • Adriano Kaneo Nagata Tortuga Cia Zootécnica Agrária, São Paulo, São Paulo, Brasil
  • Paulo Borges Rodrigues Universidade Federal de Lavras (UFLA), Lavras, Minas Gerais, Brasil
  • Márcio Gilberto Zangeronimo Universidade Federal de Lavras (UFLA), Lavras, Minas Gerais, Brasil
  • Luis Eduardo Avelar Pucci Universidade Federal de Lavras (UFLA), Lavras, Minas Gerais, Brasil
  • Renato Hespanhol Universidade Federal de Lavras (UFLA), Lavras, Minas Gerais, Brasil

DOI:

https://doi.org/10.5216/cab.v12i4.10247

Keywords:

Poultry Production

Abstract

The objective of this study was to evaluate the performance and the pollutant excretion of broilers from 1 to 21 days of age fed diets with different levels of metabolizable energy (MEn), crude protein (CP) and available phosphorus (aP), supplemented with amino acids and phytase. To evaluate the performance, 1,350 Cobb broilers at one day of age (weight of 45.5 ± 0.9g) were distributed in a completely randomized design in a 4x2+1 factorial arrangement (four levels of MEn – 2,850; 2,950; 3,050 and 3,150 kcal/kg – and two of CP and aP – 17 with 0.34% and 19 with 0.25%, respectively, all with phytase, and an additional treatment – control, without phytase, with 21% PB, 3,000 kcal/kg MEn and 0.46% aP), in six replications with 25 birds. To evaluate the excretion of pollutants, 270 broilers at 14 days of age were allotted in metabolic cages in groups of five during seven days, using the same statistical design. Although the use of phytase reduced phosphorus and copper excretion, it decreased weight gain and increased feed conversion ratio in all studied nutritional plans. In phytase-diets, the energetic levels linearly reduced feed intake and improved feed conversion ratio and calcium and potassium excretion. Energy reduced the nitrogen, phosphorus and zinc excretion only in 17% CP and 0.34% aP diets. Crude protein reduction in phytase-diets improved feed conversion ratio and reduced nitrogen and potassium excretion. It was concluded that phytase decreases broiler performance until the third week of age when combined with reduced levels of CP and aP in diets.

KEYWORDS: additive; enzyme; excrement quality; ideal protein; nutrition.

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Author Biographies

Adriano Kaneo Nagata, Tortuga Cia Zootécnica Agrária, São Paulo, São Paulo, Brasil

 

 

 

 

Paulo Borges Rodrigues, Universidade Federal de Lavras (UFLA), Lavras, Minas Gerais, Brasil

 

 

 

 

Márcio Gilberto Zangeronimo, Universidade Federal de Lavras (UFLA), Lavras, Minas Gerais, Brasil

 

 

 

 

Luis Eduardo Avelar Pucci, Universidade Federal de Lavras (UFLA), Lavras, Minas Gerais, Brasil

 

 

 

 

Published

2011-12-20

How to Cite

ALVARENGA, R. R.; NAGATA, A. K.; RODRIGUES, P. B.; ZANGERONIMO, M. G.; PUCCI, L. E. A.; HESPANHOL, R. PHYTASE ADDITION TO DIETS WITH DIFFERENT LEVELS OF METABOLIZABLE ENERGY, CRUDE PROTEIN AND AVAILABLE PHOSPHORUS TO BROILERS FROM 1 TO 21 DAYS OF AGE. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 12, n. 4, p. 602–609, 2011. DOI: 10.5216/cab.v12i4.10247. Disponível em: https://revistas.ufg.br/vet/article/view/10247. Acesso em: 3 apr. 2025.

Issue

Section

Animal Production