Reproductive cycle disorders in dairy cattle and their diagnostics

Due to the occurrence of oestrous cycle disorders, dairy cattle breeders suffer a lot of economic losses and a lot of time. This oestrous disorders based on the different sources where called as ‘silent estrus’, corpus luteum retention, corpus luteum cyst, ovarian cyst, as well as embryo mortality is a very important and common phenomenon. In the course of the research, 354 cows were observed in the organic dairy farm after calving, treated with medication and re-inseminated or stimulated after estrus. Summarizing the results of the research, the most common causes of the diseases from the oestrous cycle disorders were determined together with the influence of different factors on gynecological diseases and oestrous cycle disorders. The identification of these factors allows to predict and speed up the diagnosis of oetrous cycle disorders and to prevent these disorders by prescribing special treatment. During the research, calving was diagnosed in 71,5 % of cases, 18,1 % was rejected as defective, and the rest 10,4 % - re-inseminated or further observed. The cows tested ranged from I to IX lactation, which were divided into 4 lactation groups. In the first lactation group there were 34,5 % of cows, in the second – 27,6 %, in the third – 22,9 % and in the fourth group – 15,0 % of cows tested. Moreover, in each group, the influence of born calves gender, their number and birth season or other illnesses was diagnosed on manifestation of gynecological diseases. It was found that retained placenta mostly was detected in cows of the II lactation irrespective of the gender of the calf (in case of young bull – 14,9 %, and heifer – 13,7 % ), while the subinvolution of the uterus was detected in cows of I lactation (44,0 % of cases), and older than IV lactation cows in case of born heifer (42,9 % of cases). It was determined that the number of offspring born, the sex of the calf born and the influence of other diseases (sole ulcers, mastitis) had major influence on reproductive disorders in the servis period