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Journal of equine science2022; 33(1); 1-6; doi: 10.1294/jes.33.1

Effect of short-term artificial light and transvaginal progesterone device on first ovulation in late transitional mares.

Abstract: In study I, plasma progesterone concentrations were evaluated in anoestrous mares that received an intravaginal progesterone release device (IPRD) for 10 days. Mares were divided into 3 groups based on the dosage of progesterone (0 g, n=3; 1.38 g, n=5; and 1.9 g, n=5). No statistical differences were found in plasma progesterone concentrations between the two doses tested. In study II, the effects of a protocol based on a short program of artificial light combined with an IPRD containing 1.38 g of progesterone on oestrous behaviour and onset of ovulation were evaluated. IPRDs were inserted into 31 late transitional mares (10 days of treatment). The mares were divided into a control group (n=9, IPRD with 0 g of progesterone) and two treatment groups (T1, n=10, IPRD with 0 g of progesterone and artificial light; T2, n=12, IPRD with 1.38 g of progesterone and artificial light). The percentages of mares in heat within the first 14 days after treatment were 100%, 70%, and 100% in the control, T1, and T2 groups, respectively (P=0.097), and their ovulation rates were 44%, 60%, and 100%, respectively (P≤0.01). In conclusion, a protocol based on artificial light and an IPRD containing 1.38 g of progesterone for 10 days could be considered to advance the first ovulation of the year in late transitional mares, as it ensures a higher rate of ovulation within the first 14 days after treatment.
©2022 The Japanese Society of Equine Science.
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Publication Date: 2022-04-19 PubMed ID: 35510073PubMed Central: PMC9018460DOI: 10.1294/jes.33.1Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research assesses the impact of artificial light and progesterone treatment on early ovulation in mares. It finds that a combination of light and a progesterone device can be beneficial in stimulating ovulation in transitional mares.

Research Overview

  • This study is divided into two sections aiming to measure the impact of increased progesterone and artificial lighting on the ovulation patterns of transitional mares. Transitional mares are those which are moving from a period of reproductive inactivity to become reproductively active once again.

Study Part 1: Progesterone Concentration

  • The first part of the study focused on evaluating plasma progesterone concentrations in mares that received an intravaginal progesterone release device (IPRD) for 10 days.
  • Mares were divided into three groups according to the dosage of progesterone they received (0 g, 1.38 g, and 1.9 g).
  • The results did not show any significant differences in plasma progesterone concentrations between the two dosages tested, indicating that the increased dose did not have a proportional impact on plasma progesterone levels.

Study Part 2: Artificial Light and IPRDs

  • The second part of the study observed the effects of a short regime of artificial light combined with an intravaginal progesterone release device (IPRD) containing 1.38 g of progesterone on oestrous behavior and onset of ovulation.
  • This experiment involved 31 late transitional mares, divided into a control group and two treatment groups. The differences across these groups were the use of artificial light and the amount of progesterone in the IPRD.
  • The results showed that while 100% of mares in the control and one treatment group (progesterone IPRD and artificial light) showed heat within 14 days, only 70% in the artificial light alone group exhibited this behavior.
  • Furthermore, there was a notable difference in ovulation rates across the three groups with the combined progesterone/artificial light group achieving a 100% ovulation rate, well above artificial light alone (60%) and the control group (44%).

Conclusions

  • In conclusion, this research suggests that a combined approach using artificial light and an intravaginal progesterone release device may improve ovulation rates in transitional mares.
  • More specifically, the use of an IPRD containing 1.38 g of progesterone over 10 days appeared to yield the best results.

Cite This Article

APA
Bianchi CP, Bruno S, Videla Dorna I, Rodríguez E, Aba MA. (2022). Effect of short-term artificial light and transvaginal progesterone device on first ovulation in late transitional mares. J Equine Sci, 33(1), 1-6. https://doi.org/10.1294/jes.33.1

Publication

Journal of equine science
ISSN: 1340-3516
NlmUniqueID: 9503751
Country: Japan
Language: English
Volume: 33
Issue: 1
Pages: 1-6

Researcher Affiliations

Bianchi, Carolina Paula
  • Laboratory of Endocrinology, Department of Physiopathology, Faculty of Veterinary Sciences, National University of the Center of Buenos Aires Province, Buenos Aires, Argentina.
  • National Scientific and Technical Research Council (CONICET), Buenos Aires, Argentina.
Bruno, Santiago
  • General Lavalle Haras, Argentine Army, Buenos Aires, Argentina.
Videla Dorna, Ignacio
  • Syntex S.A. Laboratory, Buenos Aires, Argentina.
Rodríguez, Edgardo
  • Biostatistics Area, Faculty of Veterinary Sciences, National University of the Center of Buenos Aires Province, Buenos Aires, Argentina.
Aba, Marcelo Alfredo
  • Laboratory of Endocrinology, Department of Physiopathology, Faculty of Veterinary Sciences, National University of the Center of Buenos Aires Province, Buenos Aires, Argentina.

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Citations

This article has been cited 1 times.
  1. Khan IU, Khairullah AR, Khan AY, Rehman AU, Mustofa I. Strategic approaches to improve equine breeding and stud farm outcomes. Vet World 2025 Feb;18(2):311-328.
    doi: 10.14202/vetworld.2025.311-328pubmed: 40182817google scholar: lookup
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