EFFECT OF STRAINS AND SEXING ON PERFORMANCE AND CARCASS YIELD OF BROILERS

Abstract: We carried out this study to evaluate the productive performance and carcass yield of different strains and sexing of broilers. We evaluated 576 birds of Cobb, Ross, and Hubbard strains, arranged in male, female or mixed sexing, slaughtered at 45 days of age. We used a completely randomized design (CRD), in a 3 X 3 factorial (strain X sex), with four replicates per treatment. Body weight, weight gain, feed intake, and feed conversion showed significant differences in the course of the phases evaluated; however, they were similar at the end of the study period. Males showed superior results compared to females and mixed sexing. Carcass yield showed no significant differences among strains and sexing of birds; however, in some prime cuts, Cobb presented the best results.

摘要：本研究旨在评估不同品系及性别分组肉鸡的生产性能与胴体产率。试验选用科宝（Cobb）、罗斯（Ross）与哈巴德（Hubbard）3个品系的肉鸡共576羽，按公、母或混合性别分组，于45日龄进行屠宰。试验采用完全随机设计（Completely Randomized Design, CRD），设置3×3因子试验设计（品系×性别），每个处理组设4个重复。结果显示，体重、增重、采食量及饲料转化率在各评估阶段均存在显著差异，但在试验末期无显著差异。公肉鸡的各项指标均优于母肉鸡与混合性别组。不同品系与性别分组的肉鸡胴体产率无显著差异，但在部分主要分割肉块中，科宝（Cobb）品系表现最优。