Eficiência de diferentes métodos de controle sobre oocistos de Eimeria acervulina na cama reutilizada de frangos de corte

Abstract

The efficiency of different methods of control on oocysts of Eimeria acervulina in broilers was evaluated. Preventive methods in the reused bed had been tested as the fermentation and the disinfection for quaternary ammonia, beyond the anticoccidian treatment of the chickens of cut with Diclazuril. 300 broilers of the Cobb strain had been used equally distributed in two stages of 150 birds each. Each stage was carried through in delineation of blocks entirely casualized, with five groups of 30 broilers. In 1ª stage, 150 birds had been inoculated experimentally, at 12 days of age, orally, with 3x103 oocysts. After sanitary interval of 15 days, in which the bed passed for the different tested methods of control was carried through 2ª stage. The others 150 birds had been lodged on the same bed of the inoculated birds, to evaluate the dynamics of the coccidian ambient reinfeccion after the treatments. Counting of oocysts per gram of excrements had been carried through (OOPG), comment of clinical signals, evaluation of zootechnical performance for the indices of weight profit and alimentary conversion, determination of scores of intestinal macroscopic injuries and intestinal histomorphometric analysis. The results had demonstrated that the disinfection of the bed reused with quaternary ammonia did not control the reinfeccion of the broilers. The method of fermentation of the bed associated or not with the disinfection for quaternary ammonia, was capable to reduce the number of oocysts recouped of excrements of the birds for controlling the ambient contamination. Although Diclazuril have reduced the infectant load of oocysts in the birds, this was not capable to control the ambient recontamination. The fermentation of the reused bed can be considered an efficient method of control of avian coccidiosis for E. acervulina.