Franklin Steven Bryan, Young Marion Belinda, Ciacciariello Mariana
Department of Animal and Poultry Science, University of KwaZulu-Natal, Private Bag X01, Scottsville 3201, South Africa.
Animals (Basel). 2022 Apr 20;12(9):1067. doi: 10.3390/ani12091067.
Commercial premixes provide trace minerals (TM) such as zinc (Zn), manganese (Mn), and copper (Cu) in excess of the requirements to maximize broiler performance. High inclusion levels of TM in broiler feed and their low absorption in the gastrointestinal tract leads to increased levels of TM in the excreta, resulting in the contamination of the environment. A 35-day broiler trial was conducted with 2880 one-day-old Cobb broiler males to test the effect of the supplementation of different sources of TM on growth performance, while evaluating levels in the excreta. Inorganic (ITM), organic (OTM), and hydroxy (HTM) sources of TM were tested against a positive control of current recommended levels of ITM. At 35 d, birds fed HTM were 55 g (p < 0.05) heavier than those fed ITM at the same inclusion level. In contrast, birds fed the control, OTM, and HTM showed no significant difference in body weight. Providing broilers with HTM significantly (p < 0.05) reduced Zn and Cu excretion at 35 d of when compared to those who were fed diets containing ITM or PC. Supplementing different sources of TM to broiler diets at levels below the recommendations showed no negative effect on broiler performance. The use of HTM significantly reduced TM excretion in broilers. The use of HTM in broiler diets can maintain broiler performance and reduce the negative impact on the environment.
商业预混料提供的微量矿物质（TM），如锌（Zn）、锰（Mn）和铜（Cu），超过了需求，以最大限度地提高肉鸡性能。肉鸡饲料中高添加水平的微量矿物质及其在胃肠道中的低吸收率导致排泄物中微量矿物质水平升高，从而造成环境污染。对2880只1日龄科宝雄性肉鸡进行了为期35天的试验，以测试补充不同来源微量矿物质对生长性能的影响，同时评估排泄物中的含量水平。将无机（ITM）、有机（OTM）和羟基（HTM）来源的微量矿物质与当前推荐水平的无机微量矿物质阳性对照进行了测试。在35日龄时，饲喂羟基微量矿物质的鸡比在相同添加水平下饲喂无机微量矿物质的鸡重55克（p<0.05）。相比之下，饲喂对照、有机微量矿物质和羟基微量矿物质的鸡在体重上没有显著差异。与饲喂含无机微量矿物质或阳性对照日粮的鸡相比，给肉鸡提供羟基微量矿物质在35日龄时显著（p<0.05）降低了锌和铜的排泄量。在低于推荐水平的情况下，向肉鸡日粮中添加不同来源的微量矿物质对肉鸡性能没有负面影响。使用羟基微量矿物质显著降低了肉鸡的微量矿物质排泄量。在肉鸡日粮中使用羟基微量矿物质可以维持肉鸡性能并减少对环境的负面影响。
