[Health status of cattle in relation to the time of year]

The periodicity of morbidity rate in heifers and dairy cows kept on pasture (278 animals) and in stables (187 animals) was studied in relation to macroclimatic conditions under the assumption of two peaks per annum. The following conditions were used as the parameters of morbidity: purulent inflammations of uterus, sterility, lesions of the female tract and sepsis, dystocia, retention of placenta, mastitis, foot diseases and lying down after parturition. No significant differences were found between the studied groups of animals. A statistically significant up to highly significant dependence was found between the health of the heifers and cows and macroclimatic conditions both in stables and on pasture; an increase in morbidity rate was recorded in spring and autumn.