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SHORT COMMUNICATION
Effectiveness of selected methods for manipulating the oestrus
cycle and ovulation in mares during the breeding season:
A retrospective clinical study
1
Wojciech Ryszka-leczę konie, Wierzbowy Gaj 11, 64-300 Glinno, Poland
2
Equi Salus, Glinno 65, 64-300 Nowy Tomyśl, Poland
3
Poznań University of Life Sciences, Faculty of Veterinary Medicine and Animal Sciences, Department of Internal Diseases and Diagnostics, 60-637 Poznań, Poland
Publication date: 2025-10-13
Corresponding author
R. Kozdrowski
Poznań University of Life Sciences, Faculty of Veterinary Medicine and Animal Sciences, Department of Internal Diseases and Diagnostics, 60-637 Poznań, Poland
Poznań University of Life Sciences, Faculty of Veterinary Medicine and Animal Sciences, Department of Internal Diseases and Diagnostics, 60-637 Poznań, Poland
KEYWORDS
artificial inseminationcloprostenoloestrushuman chorionic gonadotropinmaremultiple ovulationsmultiple pregnancies
TOPICS
ABSTRACT
Hormones used for the induction of oestrus and ovulation are
widely applied in veterinary practice. The objectives of this study were to assess:
(1) the effectiveness of cloprostenol in inducing oestrus, and (2) the influence
of cloprostenol and human chorionic gonadotropin (hCG) on the incidence of
multiple ovulations (MO) and multiple pregnancies (MP). The first group of mares
(n = 77), which entered spontaneous oestrus, received hCG to induce ovulation,
while the second group (n = 40) had oestrus induced with cloprostenol, followed
by hCG injection. The pregnancy rate was 55.8% in the first group and 65% in
the second group (P < 0.073). The frequency of MO was significantly higher
in the second group (27.5%) compared to the first group (3.9%; P < 0.0006).
However, this treatment did not affect the incidence of MP. Endometrial oedema
scores at the time of hCG administration decreased significantly over time in
both groups. These results suggest that hormonal manipulation of the oestrous
cycle during the breeding season and ovulation induction can help ensure
satisfactory pregnancy rates. Moreover, cloprostenol can increase the frequency
of MO without affecting MP rates.
CONFLICT OF INTEREST
The Authors declare that there is no conflict of interest.
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