Abstract
In the article it is noted that when the age of physiological maturity is reached, most of mares do not go hunting because of genital infantilism. The authors' studies showed that in the group where the repair filly had a systematic communication with the vasectomized stallions at 36 months of age, the reproductive apparatus was well developed, there were no signs of genital infantilism. All mares were found at the age of 36–37 months, and they became foal, at the mares of the control group at the indicated age the sexual cycles did not appear regularly, signs of genital infantilism were noted. The authors note that the vasectomized stallion provides, normal development of the reproductive sexual system of the repair mares, the full formation and manifestation of sexual cycles. The use of vasectomized stallions allows for an early effective prevention of genital infantilism and infertility in repair mares. Dosed communication of fillies with vasectomized colts and sterile coitus during sexual development promoted the physiological development of the genitals and the full manifestation of the sexual cycle.
Highlights
Horse breeding in Kazakhstan is developing at a good pace
Control filly had no contact with males before physiological maturity. In carrying out these studies, we studied the degree of development of the sexual apparatus, the manifestations of the sexual cycles, the actual onset of physiological maturity, the manifestation of infantilism, fertilization in the first and subsequent cycles, the course of pregnancy, childbirth and the postpartum period in experimental and control animals
We found that in mares that had the opportunity to communicate with vasectomized stallions and sterile coitus, at the onset of physiological maturity, 27.6% of full sexual cycles were noted more than in the control group
Summary
Horse breeding in Kazakhstan is developing at a good pace. The pedigree qualities of horses are increased by importing highly productive horses from abroad and skillfully conducting breeding works (Dzhulanov et al, 2010). The importation of pedigree horses into the country pursues the goal of their participation in sports and, after the completion of the sports career – the acquisition of an offspring that are not inferior to their parents' sports careers. These works require skilled work of veterinary specialists and close attention to the reproductive function of mares (Sevast'janova et al, 1997; Jatusevich et al, 2002). The data of scientists and practitioners testify that in many horse farms the reproduction of horses is unsatisfactorily organized, and the fillies intended for repair are generally not inseminated at the age of more than three to five years (Fedorov et al, 1996; Jatusevich et al, 2002). Given the theoretical and practical significance of this issue, we conducted a series of studies to study the effect of physiological stimulation of the filly, starting at the age of 20 months and older than the coevals
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