Dysfunctional ovarian disorders clinical and morphological diagnostics in beef cattle

The purpose of the study is to develop criteria for the differential diagnosis of dysfunctional ovarian disorders in beef cows of the Kazakh white-headed and Aberdeen Angus breeds. The studies were carried out on the basis of the Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, Volgograd State Agrarian University in 2009-2017, as well as in the farms of the Akmolinsk and the North Kazakhstan Regions of the Republic of Kazakhstan and the Volgograd Region of the Russian Federation. Dysfunction of the ovaries was diagnosed on the basis of the analysis of primary zootechnical records, as well as 2-fold vaginal, rectal and echographic examinations with an interval of 10-12 days. Clinical and diagnostic studies, as well as analysis of field material were carried out on 2,592 beef cows and heifers of breeding age. The hypofunctional state of the ovaries was found in 523 lactating cows and 126 heifers of breeding age. Most often, hypofunction of the ovaries was recorded in cows of the Aberdeen Angus breed (29.88 %), as well as the Kazakh white-headed (23.0 %). Persistent ovarian corpus luteum was found in 5.98±0.21 % of cows. Ovarian cysts were noted in 2.29±0.76 % of animals, the maximum distribution did not exceed 5.66 %. In general, the number of functional disorders in cows reached 34.07±7.63 %. Follicular cysts were found in 2.29±0.76 % of animals. Functional disorders in cows reached 34.07±7.63 %. Clinically, follicular cysts were manifested in cows and heifers by multiple stages of excitation of the sexual cycle and infertile insemination. In 72.73 % of cases, single and in 27.27 % of cases, multiple follicular cysts were recorded. On echograms, follicular cysts were oval-rounded, thin-walled, with fairly homogeneous echogenic contents. Round or oval shapes are more typical for single follicular cysts. Luteal cysts were clinically manifested by a long-term absence of sexual cyclicity. On echograms, luteal cysts were identified as round-shaped cavities with liquid, 18 to 31 mm in diameter (average 20.67±5.62 mm). In the cysts of the corpus luteum, a layer of echopositive tissue 3-7 mm thick was clearly observed.