EGG QUALITY AND PRODUCTIVE PERFORMANCE OF LAYING HENS IN SECOND CYCLE OF POSTURE FED WITH AMINOACID CHELATED TRACE MINERALS

Abstract The goal of this research was to evaluate egg quality and performance of laying hens at the second laying cycle, fed with minerals from an organic source. The control treatment consisted of basal diet with inorganic trace minerals, whereas the other treatments consisted of organic copper, iron, manganese, and zinc at levels of 100%, 90%, 80%, and 70%. Physical and chemical analyses were performed to evaluate egg quality. The average egg weight reduced in the test diet; however, egg mass, as well as the other performance variables evaluated, did not suffer influence of treatments. The percentage of egg protein decreased; however, mineral matter content and egg shell increased with the use of organic minerals, as well as an improvement in the egg quality parameters occurred. The supplementation with organic trace mineral source of the diet of laying hens did not compromise internal egg quality. The total replacement of inorganic sources for levels of organic minerals in the diet of birds provided maintenance on the performance and improved shell quality.

摘要 本研究旨在评估饲喂有机源矿物质的产蛋鸡第二个产蛋周期的蛋品质与生产性能。对照组饲喂添加无机微量矿物质的基础日粮，其余试验组分别添加100%、90%、80%、70%剂量的有机铜、有机铁、有机锰与有机锌。采用物理与化学分析方法评估蛋品质。试验组日粮饲喂的蛋鸡平均蛋重有所降低，但总蛋重及其他被评估的生产性能指标均未受试验处理的影响。鸡蛋的蛋白质占比有所下降，但使用有机矿物质后，灰分含量与蛋壳质量得以提升，同时多项蛋品质参数得到改善。在产蛋鸡日粮中添加有机微量矿物质来源，并未损害蛋内部品质。完全用有机矿物质替代日粮中的无机矿物质来源，可维持产蛋性能并改善蛋壳品质。