Abstract
The article presents the results of the analysis of the pregnancy rates of mares depending on the duration of the intervals from cloprostenol preparation injection to ovulation. It was found that with a decrease in the interval (≤7 days), the pregnancy rate decreases by 30% (p≤0.05). To determine the optimal time for cloprostenol use, an analysis of the intervals from injection to ovulation was performed, depending on the day of the sexual cycle and the largest follicle diameter. The average intervals before ovulation in the groups, depending on the day of injection (5, 6-7, 8-10, 11-15 days), have a duration from 8.5±0.4 to 11.1±0.5 days. However, it is difficult to predict the time of ovulation, since the duration of the interval from cloprostenol treatment to ovulation varies greatly, the difference in the extreme values in the groups can be from 8 to 13 days. More precisely, it is possible to predict the duration of the interval until the follicle reaches 35 mm with a known diameter of the largest follicle at the time of injection. In this way, in the group with the diameter of the largest follicle ≤22 mm, this interval is 7.13±0.17 days, from 23 to 26 mm - 4.59±0.16 days, from 27 to 30 mm - 2.91±0.13 days. The difference in the duration of the intervals before ovulation in these groups is more significant – from 5 to 11 days and depends on the individual duration of the mare estrus.
Highlights
One of the main factors contributing to the achievement of high results of the breeding company on breeding farms and stud farms is the competent use of hormonal preparations to regulate the processes occurring in the reproductive system of mares
It is obvious that a short interval in most cases corresponds to a shortened estrus, which causes a reduced pregnancy rate in this group
The results obtained are consistent with the previous results of our studies of the pregnancy rate level in cycles with short estrus [14] and similar studies by Juan Cuervo-Arango Lecina [8]
Summary
One of the main factors contributing to the achievement of high results of the breeding company on breeding farms and stud farms is the competent use of hormonal preparations to regulate the processes occurring in the reproductive system of mares As a rule, they are used to shorten the diestral phase of the cycle during sexual cyclicity, interrupt prolonged diestrus, synchronize the cycles of donor mares and embryo recipients, and enhance intrauterine clearance in the treatment of endometritis [1]. Synthetic analogues of prostaglandin PGF2a – cloprostenol and dinoprost - are widely used for these purposes The mechanism of their action is based on the interruption of the corpus luteum functioning (luteolysis) and the induction of prolonged low-amplitude uterus contractions [2, 3].
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