THE EFFECTS OF LACTATE-DEHYDROGENASE VIRUS (LDV) ON THE REPRODUCTIVE-PERFORMANCE AND HEALTH OF BOVINE FEMALES

A positive LDV antibody test was recorded in 41.8 % tested females, a doubtful in 6.3 % and a negative in 51.9 %. Highly significant differe nces (P < 0.01) were found in the frequencies of positive and/or negat ive LDV antibody tests as related to clinical examination of reproduct ion and/or metabolic level and to health of bovine females. In positiv ely tested females, antibodies were transferred to their progeny. The effects of LDV antibody presence on the concentration of urea, Ca and P in the blood, activity ALP and AST in the blood, on milk fat and mil k acidity, lactase content and SCC value were demonstrated as well. Th e male progeny of positively tested females was characterized by a non -significant, lower body weight to 6 months of age.