Performance, duodenal morphology and histopathology of broiler liver fed diets containing different levels of organic selenium in heat stress conditions

The research was conducted to evaluate the performance, duodenal morphology and histopathological changes in the liver of broilers fed diets containing different levels of selenium (0.5, 1.1, 1.7, 2.3, 2, 9 and 3.5ppm Se / kg diet), created in the period 1-21 days old, under heat stress conditions. The birds were isonutritives diets based on corn and soybean meal, formulated to meet the nutritional requirements, except for selenium. From a basic diet supplementation of selenium was taken, such as use of selenomethionine (Sel - Plex®). Seven hundred and twenty chicks of mixed lineage Ross 308, were used in a randomized complete block design with six treatments and six replicates of twenty birds each. The internal environment of the sheds was evaluated based on the Temperature Index Black Globe Humidity (BGT), the Temperature and Humidity Index (THI) and Effective Temperature (ET). The use of organic selenium supplementation in the diet of broilers improves feed conversion, but does not interfere in the length parameter crypt and villus height and does not promote inflammation in the liver of these, in both levels.

本研究旨在评估热应激条件下1~21日龄肉鸡的生长性能、十二指肠形态及肝脏组织病理学变化，试验肉鸡饲喂添加了不同水平硒（0.5、1.1、1.7、2.3、2.9、3.5ppm Se/kg日粮）的日粮。试验日粮以玉米和豆粕为基础配制为等营养日粮，除硒元素外，其余营养成分均满足肉鸡营养需求，基础日粮的硒源为硒代蛋氨酸（Sel-Plex®）。本试验选用720只罗斯308（Ross 308）混合品系肉鸡，采用完全随机区组设计，设置6个处理组，每组设6个重复单元，每个重复单元包含20只肉鸡。试验通过黑球温湿度指数（BGT）、温湿度指数（THI）与有效温度（ET）对圈舍内部环境进行监测与评价。结果表明，在肉鸡日粮中添加有机硒可改善饲料转化率，但对隐窝长度与绒毛高度参数无显著影响；且无论硒添加水平如何，均不会诱发肉鸡肝脏炎症反应。