The dynamics of Eimeria spp. infection in calves treated and untreated with Baycox

The studies were carried out in two farms- ZZK Kolbacz and SK Bielin, on 60 calves-30 animals in each farm. The calves ware divided into control and experimental groups-15 animals per group. The extent and intensity of the Coccidia infection were determined by means of the Willis-Schlaaf's and McMaster's methods, whereas the Coccidia composition in the examined animals was determined according to the morphological features of the oocysts and the sporulation time. The following six Eimeria species were isolated in these commerical farms-E.bovis, E.aubernensis, E.zurni, E.ellipsolidalis, E.subsherica and E.cylindrica. Baycox was administered twice in a 7-days interval in a dose of 20 mg/kg of body weight. The weight gain and the coarse of coccidia infection in calves before and after treatment with Baycox were examined. During the period of the study the intensity of the coccidia infection was very high amongst the control group. After administration of Baycox the intensity of coccidia infection decreased and only 0-80 oocysts were found in 1 g of feaces. In SK Bielin the incidence of clinical coccidiosis and mortality was observed in 6.9 % of calves. After Baycox administration only 1.9 % of the animals died. The results were statistically analysed and significant differences of p less than or equal to 0,01 between the control and experimental group in SK Bielin were observed.