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Home / Equine Research Bank / Equine Vet J / Effects of time of insemination relative to ovulation on pre...
Equine veterinary journal1990; 22(6); 410-415; doi: 10.1111/j.2042-3306.1990.tb04306.x

Effects of time of insemination relative to ovulation on pregnancy rate and embryonic-loss rate in mares.

Abstract: The effects of pre-ovulatory and post ovulatory insemination on pregnancy rate and embryonic-loss rate were studied in 268 mares in two experiments. Within each experiment mares were randomised within replicates as follows: to be inseminated on the day the pre-ovulatory follicle reached 35 mm (pre-ovulatory group), to be inseminated on the day of ovulation (Day 0 group), and to be inseminated on the day after ovulation (Day 1 group). Ultrasonic pregnancy diagnoses were performed on Days 11, 12, 13 and 14 (Experiment 1) and Days 11, 12, 13, 14, 15, 20 and 40 (Experiment 2). Combined for the two experiments, pregnancy rates were different (P less than 0.01) among the three groups. For Experiment 2, pregnancy rate within the pre-ovulatory group was lower (P less than 0.05) for insemination 4 days or more before ovulation than for up to 3 days before ovulation. Pregnancy rate was lower (P less than 0.05) for the Day 0 group than for the pre-ovulatory group inseminated up to 3 days before ovulation. In Experiment 2, ovulation was detected by examinations every 6 h; pregnancy rate was greater (P less than 0.05) for mares inseminated 0 to 6 h after ovulation than for mares inseminated at 18 to 24 h. No pregnancies occurred when mares were inseminated 30 h or more after ovulation. The mean day of first detection of the embryonic vesicle was different (P less than 0.0001) among the three groups. Diameter of embryonic vesicle averaged over Days 11 to 15 also differed (P less than 0.0001) among groups.(ABSTRACT TRUNCATED AT 250 WORDS)
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Publication Date: 1990-11-01 PubMed ID: 2269264DOI: 10.1111/j.2042-3306.1990.tb04306.xGoogle Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't

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 article investigates the impact of timing of insemination in relation to ovulation on the rates of pregnancy and embryonic loss in mares. The research demonstrates that precise timing of insemination significantly affects these rates.

Objective & Methodology

  • The primary objective was to analyze how timing of insemination, specifically pre-ovulatory and post-ovulatory, affects pregnancy and embryonic loss rate. For this purpose, 268 mares were studied over two experiments.
  • The mares within each experiment were sorted randomly into three groups based on the insemination timing: when the pre-ovulatory follicle was 35mm (pre-ovulatory group); on the day of ovulation (Day 0 group); and the day after ovulation (Day 1 group).
  • Ultrasonic pregnancy tests were performed on various days post-insemination to track the progression of each potential pregnancy.

Findings

  • The results showed significant differences in pregnancy rates between the three groups. More specifically, in Experiment 2, the pregnancy rate was lower in the pre-ovulatory group when insemination occurred 4 days or more before ovulation versus up to 3 days before ovulation.
  • The Day 0 group showed a lower pregnancy rate when compared to the pre-ovulatory group where insemination took place up to 3 days prior to ovulation.
  • Interestingly, for mares in Experiment 2 where ovulation was carefully monitored, those inseminated 0 to 6 hours after ovulation had a higher pregnancy rate than those inseminated 18 to 24 hours after ovulation. Insemination 30 hours or more after ovulation yielded no successful pregnancies.
  • Additionally, there were significant differences observed in the day of first detection of the embryonic vesicle among the three groups and differences in the diameter of the embryonic vesicle averaged over Days 11 to 15 between the groups.

Conclusion

  • Overall, the timing of insemination relative to ovulation significantly impacts pregnancy and embryonic-loss rates in mares.
  • These results can provide valuable insights for establishing effective breeding strategies for mares and potentially other mammal species too.

Cite This Article

APA
Woods J, Bergfelt DR, Ginther OJ. (1990). Effects of time of insemination relative to ovulation on pregnancy rate and embryonic-loss rate in mares. Equine Vet J, 22(6), 410-415. https://doi.org/10.1111/j.2042-3306.1990.tb04306.x

Publication

Equine veterinary journal
ISSN: 0425-1644
NlmUniqueID: 0173320
Country: United States
Language: English
Volume: 22
Issue: 6
Pages: 410-415

Researcher Affiliations

Woods, J
  • Department of Veterinary Science, University of Wisconsin-Madison 53706.
Bergfelt, D R
    Ginther, O J

      MeSH Terms

      • Animals
      • Embryonic and Fetal Development
      • Female
      • Fertilization
      • Horses / embryology
      • Horses / physiology
      • Insemination, Artificial / veterinary
      • Ovulation
      • Pregnancy
      • Pregnancy Tests / veterinary
      • Ultrasonography, Prenatal / veterinary

      Citations

      This article has been cited 7 times.
      1. Fanelli D, Moroni R, Bocci C, Camillo F, Rota A, Panzani D. Interspecific and Intraspecific Artificial Insemination in Domestic Equids. Animals (Basel) 2023 Feb 7;13(4).
        doi: 10.3390/ani13040582pubmed: 36830369google scholar: lookup
      2. Ashraf R, Rashid S, Rasheed I, Asif S. Early embryonic death in equines and camelids. Open Vet J 2022 Nov-Dec;12(6):903-909.
        doi: 10.5455/OVJ.2022.v12.i6.16pubmed: 36777062google scholar: lookup
      3. Duguma A, Lemma A, Hibste A. Effect of breed and other animal-related factors on conception rate to artificial insemination with frozen semen in mares in Ethiopia. Trop Anim Health Prod 2019 Jun;51(5):1173-1178.
        doi: 10.1007/s11250-019-01804-6pubmed: 30659458google scholar: lookup
      4. Hannan MA, Haneda S, Itami Y, Wachi S, Saitoh T, Cheong SH, Nambo Y. Successful embryo transfer from Hokkaido native pony after artificial insemination with frozen semen. J Vet Med Sci 2019 Feb 19;81(2):241-244.
        doi: 10.1292/jvms.18-0414pubmed: 30606892google scholar: lookup
      5. Varner DD. Odyssey of the spermatozoon. Asian J Androl 2015 Jul-Aug;17(4):522-8.
        doi: 10.4103/1008-682X.153544pubmed: 25926611google scholar: lookup
      6. Katila T, Celebi M, Koskinen E. Effect of timing of frozen semen insemination on pregnancy rate in mares. Acta Vet Scand 1996;37(3):361-5.
        doi: 10.1186/BF03548102pubmed: 8996881google scholar: lookup
      7. Heiskanen ML, Hilden L, Hyyppä S, Kangasniemi A, Pirhonen A, Mäenpää PH. Freezability and fertility results with uncentrifuged stallion semen. Acta Vet Scand 1994;35(4):377-82.
        doi: 10.1186/BF03548311pubmed: 7676920google scholar: lookup
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