Faculty of Veterinary Medicine University of Zagreb
Abstract
Studies were performed on 26 cows, divided into 3 groups on the basis of serological (by immunodiffusion test) and haematological analyses for bovine leukosis: Group I - seropositive without changes in haemogram; group II - seropositive with changes in haemogram and group III (control) - BLV negative. A statistically significant difference was observed in the incidence of subclinical mastitis in cows from group II (P<0.05) compared to healthy animals. The most commonly isolated microorganism was S. agalactiae (46.80%), followed by Staphylococcus spp. (36.06%). The results of our studies, as well as data from other investigators evidenced that the incidence of subclinical mastitis was higher in cows with changes in the white blood cell picture due to the immunosuppressive effect of the enzootic bovine leukosis virus.Istraživanje je provedeno na 26 krava podijeljenih u tri skupine na osnovi seroloških (imunodifuzijski test) i hematoloških pretraga na leukozu goveda. U prvoj skupini bile su serološki pozitivne krave bez promjena u hemogramu. U drugoj skupini bile su serološki pozitivne krave s promijenjenim hemogramom, a u trećoj kontrolnoj skupini bile su krave serološki negativne za virus enzootske leukoze goveda. Statistički značajna razlika u pojavi supkliničkog mastitisa u usporedbi sa zdravim kravama dokazana je u krava druge skupine (P<0,05). Najčešće izdvojena bakterija bila je S. agalactiae (46,80%) te Staphylococcus spp. (36,06%). Rezultati istraživanja potvrđuju da je pojava mastitisa bila češća u krava s poremećajima u bijeloj krvnoj slici, što se pripisuje učinku virusa enzootske leukoze goveda
