CHICKENS CHALLENGED AGAINST Salmonella enterica SOROVAR ENTERITIDIS AND Eimeria tenella AND TREATED WITH ORGANIC ACIDS

Abstract A commercial organic acids compound was assessed, added to feed, to control Salmonella Enteritidis. Broilers were challenged with Salmonella Enteritidis and Salmonella Enteritidis associated with Eimeria tenella. Five hundred and four day-old Hubbard® females chicks were used in a completely randomized design in a 2x3 factorial, a total of six treatments with six replications and being 14 birds the experimental unit. Intestinal pH, cecum lesion score, oocyst faecal counts and the presence of Salmonella in the cecal tonsils and spleen of broilers were investigated. Broilers that were challenged only with S. Enteritidis that received the compound in test showed lower frequency of bacteria isolation in lymphoid organs. Besides, decreased number of oocysts of E. tenella was observed and the intestinal lesion scores caused by infection was lower. Organic acids promoted a benefit on broilers intestinal health with positive effects on the control of Salmonella Enteritidis with Eimeria tenella.

摘要：本研究评估了添加于饲料中的商用复合有机酸对肠炎沙门氏菌（Salmonella Enteritidis）的防控效果。试验肉鸡分别经肠炎沙门氏菌，以及与柔嫩艾美耳球虫（Eimeria tenella）共生的肠炎沙门氏菌攻毒。试验选用504只1日龄哈伯德（Hubbard®）肉用母雏，采用2×3因子完全随机试验设计，共设6个处理组，每组6个重复，每个重复的试验单元包含14只肉鸡。本试验检测了肉鸡的肠道pH值、盲肠病变评分、粪便卵囊计数，以及盲肠扁桃体与脾脏中肠炎沙门氏菌的检出情况。结果显示，仅经肠炎沙门氏菌攻毒且饲喂受试复合有机酸的肉鸡，其淋巴器官的细菌分离检出率更低；同时，肉鸡粪便中柔嫩艾美耳球虫的卵囊数量减少，感染引发的肠道病变评分也更低。综上，复合有机酸可改善肉鸡肠道健康，对肠炎沙门氏菌与柔嫩艾美耳球虫混合感染的防控具有积极作用。