Effects of some anthelmintics on the blood picture and weight gain in bovines

Abstract

In five lots of Nelore bovines on a fattening diet in pastures of “Colonião" grass (Panicum maximum), the effects of the following anthelmintics were studied: thiodiphenylamine (Phenothiazine), oxyenthyl trichloro dimenthyl phosphonate (Neguvon), orally and injectable, and 2,6 diiodo-para-nitrophenol (Disofen). During the 5 months that the experiment lasted, nematode egg counts were done so as to evaluate the anthelmintic action of these drugs. The animals weight gain was controlled and blood samples were collected for the following tests: hemoglobin, hematocrit and serum proteins fractions. The interpretation of the results allow us to state that the choice and the indication of the anthelmintic treatments for bovines should be based on their vermifuge or vermicidal action, as well as on the clinical diagnosis of the infestations, rather than on the hypotetic beneficial secondary effects on weight gain and blood picture: thus the systematic use of the products tested is not recommended in the routine treatment of assymptomatic verminosis.