BIO Web Conf.
Volume 36, 2021International Scientific and Practical Conference “Fundamental Scientific Research and Their Applied Aspects in Biotechnology and Agriculture” (FSRAABA 2021)
|Number of page(s)||7|
|Section||Topical Issues of Veterinary and Animal Science, Biotechnology of Production and Processing of Agricultural Products|
|Published online||01 October 2021|
The use of cloprostenol to reduce the diestral phase of the sexual cycle of mares
All-Russian Research Institute for Horse Breeding, p / o Institute of horse breeding, Rybnoe district, Ryazan region, Russia
* Corresponding author: email@example.com
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.
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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