Study concerning the Prevalence of Ovarian Diseases in Dairy Cows from a farm in North-Eastern Moldavia

Abstract

The study was performed inside a dairy cows farm in North-Eastern Moldavia, over a period of 4 consecutive years (2010-2013), on a number of 1153 Romanian Black Spotted cows in order to determine the prevalence of different ovarian diseases by year, season and lactation number.Evaluation of ovarian diseases prevalence was based on data gathered from gynaecological cows records which were took as reference. The results showed different pathological entity variation. Thus, 27.84% of the animals taken into study presented ovarian diseases, of which 13.53% are represented by persistent corpus luteum, followed by ovarian hypofunction (7.98%) and a value of 6.33% which was recorded for cystic ovarian disease.From the recorded data analysis, it has been concluded that from the total number of ovarian diseases taken into study, the highest prevalence was registered for persistent corpus luteum (48.6%), followed by ovarian hypofunction (28.66%) and cystic ovarian disease (22.74%). In relation to the different influence factors, ovarian diseases prevalence in dairy cows showed variations depending on the year of study, with mean values ranging from 20.56% (2012) to 30.22% (2010).In conclusion it is considered that the prevalence of ovarian diseases in dairy cows is recording some peak values during the cold season because of the winter feeding (high proportion of silage), lack of physical exercise and protein-rich diets for increasing the milk yield. Also, prolonged period of uterine involution (uterine subinvolution) makes the secretion of luteolytic hormone (PGF2α) to be lowered in detriment of PGE2.