Veterynarna biotehnologija – Veterinary biotechnology, 2020, 36, 55-68 [in Russian]. https://doi.org/10.31073/vet_biotech36-05
State Agrarian University of Moldova
Institute of Veterinary Medicine NAAS of Ukraine
MORPHOMETRIC CHANGES OF RABBIT REPRODUCTIVE SYSTEM IN POSTEMBRYONIC DEVELOPMENT
Introduction. Rabbit farming is of particular importance for the economic sector, given that rabbits have high fecundity and early maturity at low cost of their breeding.
The goal of the work was to assess the optimal age of female rabbits for breeding on the basis of morphometric analysis of segments of the reproductive system.
Materials and methods. Scientific research was carried out in the laboratory of the State Agrarian University of Moldova. For the study, 45 clinically healthy female rabbits were selected, aged from 10 days to 8 months of postnatal development. The organs of the reproductive system were selected from animals, which were subsequently used for morphometric analysis, which characterize the growth and development of the organism.
Results of research and discussion. In the process of postembryonic development, the rabbit female reproductive system undergoes various changes resulting in sexual and physiological maturation of organism. Analyzing the data obtained in the study of the ovaries, it was determined that percentage ratio of ovarian mass to body weight of the animals decreases in the 2nd month of postembryonic development due to increase in body weight by 2.81 compared to animals of one month age. Morphometric linear indicators of the ovaries size showed more intensive growth from the 2nd to the 4th months of postembryonic development. Changes in linear morphometric parameters were also observed at the level of tubular segments of the female reproductive system. We observed decrease in fallopian tubes growth rate from the 4th month of postembryonic development, despite an increase in the percentage ratio to the body length of the animal in five months of age. The rabbit uterus consists of two long horns that open into the vagina, separated by two cervical canals. It was determined that decrease in length growth and increase in the width of the uterus from 4 months of age causes physiological metamorphism. Analyzing data on the growth and development of the vagina, it was shown an intensive growth of this organ from 2 to 4 months of postembryonic development.
Conclusions and prospects for further research:
1. Data obtained in the study of the morphometric parameters of the reproductive system in female rabbits from 10 days to 8 months age. It was found that significant increase in the growth of reproductive organs is observed from the 2nd to the 4th month of postembryonic development.
2. Reduction in the length of the uterus is ensured by the disappearance of the uterus loops and increasing of its width resulting in wall thickening, therefore, ensuring the physiological location of the reproductive system during physiological rest.
3. Revealed data can be used for rabbit breeders for determining the optimal breeding period of animals.
Keywords: rabbits, reproductive system, morphometric changes, sex maturity.