Performance, carcass yield and calcium excretion of broilers fed diets with different amino acids and calcium levels, from 22 to 42 days of age

Revista Brasileira de Zootecnia

Araújo, Cristiane Soares da Silva²  Artoni, Silvana Martinez Baraldi²  Borges, Sebastião Aparecido¹  Araújo, Lúcio Francelino¹  Junqueira, Otto Mack² 

[1] UNESP

关键词: amino acids;    broilers;    calcium;    carcass yield;    performance   IntroduçãoA procura de novos caminhos para melhorar a qualidade de produtos de origem animal é uma tendência inquestionável na produção de alimentos;   

DOI  :  10.1590/S1516-35982002000900008

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

One experiment was conducted to evaluate different amino acid (AA) and calcium (Ca) levels for broilers from 22 to 42 days of age. Evaluated the performance, carcass yield and calcium excretion. Five forty hundred birds, Male broilers Cobb, were randomly assigned to 6 treatments in a 3x2 factorial arrangement, considering the factors AA (100, 125 and 150% NRC, 1994) and Ca (75 and 100% NRC, 1994), in three replications of 30 birds each. The studied AA were methionine, methionine+cystine, lysine and threonine. The performance of the birds was analyzed according to body weight, weight gain, feed intake and feed conversion. Carcass yield and the percentage of each part were evaluated from 2 birds randomly taken from each pen at 42 days of age, in a total of 6 birds per treatment. Carcass yield was evaluated just after the slaughter in relation to individual percentage carcass as well as breast, legs (thigh and drumstick), wing, back, head+neck and feet. Besides, the excreted calcium of the birds was analyzed. For so much, it was used 72 birds, in experiment, housed in cages, following the same design described previously. It was not found interaction between the factors studied. The birds fed diet 125% and 150% AA showed improvement in feed conversion. Breast yield was affected by dietary Ca.

【 授权许可】

CC BY-NC