Abstract
In the wild fauna of the Amur region there has been a decrease in the population of Siberian roe deer in recent years. Abnormalities associated with loss of reproductive quality affect the number of animals. When analyzing pathological abnormalities in the reproductive organs, it is important to take into account not only the morphology in the structure of the genitals, but also the defective development of spermatozoa. The aim of this research is to study the influence of morphological deviations in the testes and epididymides in male Siberian roe deer on the development of spermatozoa.The object of the study was 24 males of Siberian roe deer aged from 1 to 6 years old; they were divided into 2 groups of 12 individuals each, from which the testes with epididymides were selected, and visual morphometric and histological studies were performed using generally accepted methods. Morphological abnormalities in roe deer were observed at the age of up to 1 year old. The greatest number of pathologies was found in male roe deer aged from 2 to 3 years old and older than 6 years old. Histological analysis of the testes and epididymides showed violations in the composition of the structural elements of this organ; they contribute to the further development of deviations. The main reason for the violation of spermatogenesis in roe deer is oligospermia, deformation of the convoluted seminal tubules, which leads to a violation of the development of gonadocytes.
Highlights
In modern veterinary medicine, one of the most important tasks is to solve problems associated with impaired reproductive qualities in agricultural livestock, and among mammals of the wild fauna, especially those that are a feed link in the chain of carnivores
Since the extraction of ejaculate is very difficult in animals living in the wild fauna, histological studies of the testes and their epididymides during veneral excitement can help to detect the main shifts in the process of spermatogenesis
As a result of the analysis of all the studied groups of male roe deer, summary tables were compiled (Nos. 1 and 2), which show the number of morphological deviations in the testes and their epididymides
Summary
One of the most important tasks is to solve problems associated with impaired reproductive qualities in agricultural livestock, and among mammals of the wild fauna, especially those that are a feed link in the chain of carnivores. In 2016, when recording this species, 71196 individuals were found. Since 2017 the total number of roe deer has decreased in the Amur region. In 2019 this figure was 53793 individuals. Despite the fact that anthropogenic factors [1,2], climatic factors [3,4,5], and the influence of predators [6] contribute to changes in the number of animals living in the wild fauna, abnormalities associated with the loss of reproductive qualities play a special role. When analyzing pathologies in the reproductive organs, a wide range of questions is raised, related to morphological deviations in the structure of the genitals, and to the defective development of spermatozoa. Since the extraction of ejaculate is very difficult in animals living in the wild fauna, histological studies of the testes and their epididymides during veneral excitement can help to detect the main shifts in the process of spermatogenesis
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