精品文档---下载后可任意编辑锌水平对笼养育成蛋鸭生长及生化指标的影响的开题报告摘要：本讨论旨在探究锌水平对笼养育成蛋鸭生长及生化指标的影响。采纳随机分组的实验设计，将 240 只 25 日龄育成蛋鸭随机分为 4 个处理组，分别为对比组和 3 个不同锌水平组。对比组饲料中锌含量为35mg/kg，锌水平组分别为 70mg/kg、140mg/kg 和 280mg/kg。试验期为 6 周，每周测定一次生长性能和生化指标。结果显示，随着锌水平的增加，育成蛋鸭体重、体重增长率、饲料转化率和生长激素水平都呈现出逐渐增加的趋势；同时，血液中白蛋白、总蛋白和碱性磷酸酶活性也随着锌水平的增加而提高，而丙氨酸氨基转移酶活性则呈现出逐渐降低的趋势。综合分析结果表明，适当提高育成蛋鸭饲料中的锌水平可以显著提高生长性能和生化指标，有望成为提高育成蛋鸭养殖效益的一种有效途径。关键词：锌、育成蛋鸭、生长性能、生化指标Abstract:The objective of this study was to investigate the effect of zinc levels on growth and biochemical indexes of caged laying ducklings. A randomized experimental design was used and 240 25-day-old laying ducklings were randomly divided into 4 treatment groups, including a control group and 3 different zinc level groups. The zinc content in the control group was 35mg/kg, while the zinc level groups were 70mg/kg, 140mg/kg and 280mg/kg, respectively. The experimental period was 6 weeks, and growth performance and biochemical indexes were measured once a week. The results showed that with the increase of zinc levels, the body weight, weight gain rate, feed conversion ratio, and growth hormone levels of the laying ducklings showed a gradual increase. At the same time, the levels of albumin, total protein, and alkaline phosphatase activity in the blood also increased with the increase of zinc levels, while the activity of alanine aminotransferase showed a gradual decrease. The comprehensive analysis of the results showed that appropriately increasing the zinc level in laying duck feed can significantly improve growth performance and biochemical indexes, which may become an effective way to improve the breeding efficiency of laying ducks.精品文档---下载后可任意编辑Key words: zinc, caged laying ducklings, growth performance, biochemical indexes
