Lysine levels in diets for broilers from 8 to 21 days of age

This study was conducted to evaluate the effects of digestible lysine levels in diets with and without supplementation of industrial amino acids on performance and fat deposition in the carcass of broilers in the starter phase. One thousand four hundred and forty chickens with initial weight of 168.1±5.0 g were distributed in a completely randomized experimental design, in a 5 × 2 factorial arrangement, composed of five digestible lysine levels (10.0, 11.0, 12.0, 13.0 and 14.0 g/kg) and two types of diet (diet with different proportions of corn and soybean meal and diet supplemented with industrial amino acids to obtain the digestible lysine levels), with eight replications and 18 birds per replication. There was interaction effect only on weight gain and fat deposition in the birds. The lysine levels reduced feed intake linearly in both diets, but caused a linear increase in lysine intake. The lysine levels quadratically affected weight gain and feed conversion, which improved up to the estimated levels of 13.0 and 12.8 g/kg lysine, respectively, when the corn:soybean meal ratio of the diet changed. In the diets supplemented with amino acids, the lysine levels increased weight gain and improved feed conversion linearly. Regardless of the type of diet, protein deposition increased linearly, whereas fat deposition reduced also linearly, as the lysine levels in the diets were increased. The levels of 13.0 and 14.0 g/kg digestible lysine provide, respectively, the best performance in birds fed a diet in which the proportion of corn and soybean meal varies and a diet supplemented with industrial amino acids, in the period from 8 to 21 days of age.

Bibliographic Details

Main Authors:	Oliveira,Will Pereira de, Oliveira,Rita Flávia Miranda de, Donzele,Juarez Lopes, Albino,Luiz Fernando Teixeira, Campos,Paulo Henrique Reis Furtado, Balbino,Eric Márcio, Maia,Ana Paula de Assis, Pastore,Silvana Marques
Format:	Digital revista
Language:	English
Published:	Sociedade Brasileira de Zootecnia 2013
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013001200006
Tags:	Add Tag No Tags, Be the first to tag this record!