SciELO - Scientific Electronic Library Online

 
vol.28 issue3Alternative animal models to estimate (co) variance components and genetic and phenotypic parameters for birth weight in Nellore cattleNutritional requirements of methionine+cystine by white-egg and brown-egg layer hens in the second production cycle: 1. productive traits author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Revista Brasileira de Zootecnia

Print version ISSN 1516-3598

Abstract

ALBINO, Luiz Fernando Teixeira et al. Methionine + cystine levels for broilers from 1 to 21 and from 22 to 42 days of age. R. Bras. Zootec. [online]. 1999, vol.28, n.3, pp. 519-525. ISSN 1516-3598.  http://dx.doi.org/10.1590/S1516-35981999000300012.

This experiment was carried out to determine the nutritional requirement of methionine + cystine (sulfur amino acids) for Hubbard and Ross broilers from 1 to 21 and from 22 to 42 days of age, of both sexes. Weight gain, intake, feed:gain and carcass composition were evaluated. Two thousand and four hundred broilers were used in the phase from 1 to 21 of age and 1800 broilers in the phase from 22 a 42 days of age. Basal diets with 21 and 19% of the CP and 3000 and 3100 kcal ME/kg were supplemented with six levels of methionine + cystine in the phases from 1 to 21 and from 22 to 42 of age, respectively. The estimated requirements of methionine + cystine ( 0; .06; .12; .18; .24; and .30) for the phase from 1 to 21 days were. 886% and .896%, .890% and .868% and for the phase from 22 to 42 days, .795%, and .802%, .810% and .792% for Hubbard and Ross male and female, respectively.

Keywords : requirement; broiler; methionine + cystine.

        · abstract in Portuguese     · text in Portuguese     · pdf in Portuguese