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Home / Equine Research Bank / Theriogenology / Equine frozen semen: freezability and fertility field result...
Theriogenology2006; 48(6); 907-917; doi: 10.1016/s0093-691x(97)00319-1

Equine frozen semen: freezability and fertility field results.

Abstract: The freezability of stallion semen defined as the number of selected ejaculates/total number of ejaculates frozen from 161 different stallions was analyzed. Of the stallions, 19, 30, 27 and 24% had a freezability of 0%, 0 to 33%, 33 to 66%, over 66%, respectively In 85 different stallions, the correlation of freezability between first and second year was 0.60 (P < 0.001). The relationship between fertility with fresh and frozen semen and freezability was analyzed in 40 stallions whose freezability and fertility information was recorded during 5 years. There was a strong relationship between fertility of fresh semen and semen freezability (P < 0.001). However, the relationship between fertility of frozen semen and freezability was not as marked (P < 0.05). Analysis of the field fertility per cycle results when mares were bred with 300 or 150 x 10(6) total spermatozoa at different frequencies until ovulation indicated that mares that were inseminated 2 times or more per estrus show an improved fertility in comparison with mares inseminated only once (34%, n = 1576 vs 26%, n = 626; P < 0.001). Foaling rate when mares were inseminated with frozen semen (1858 mares during 8 breeding seasons) was mainly influenced by mare age (< 16 years: 54% vs >/= 16 years 42% p < 0.001). Date of first insemination (before May 15: 58% vs after May 15: 37%) also had a significant effect on foaling rate (P < 0.001).
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Publication Date: 2006-05-27 PubMed ID: 16728182DOI: 10.1016/s0093-691x(97)00319-1Google 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.

This study examines the freezeability and fertility of stallion semen, finding a connection between the fertility of fresh semen and the success of freezing, along with correlations between factors like mare age and date of insemination and the foaling rate.

Overview of the Research

  • The researchers studied the ‘freezability’ of semen samples from 161 different stallions. ‘Freezability’ refers to the success rate of freezing and storing semen for later use, expressed as the fraction of successful freezes out of total attempts.
  • They found varying degrees of freezability amongst the stallions, with some showing no successful freezes and others having a success rate of over 66%.
  • The results also showed a statistically significant, mid strength correlation of freezability between the first and second year in 85 studied stallions.

Fertility and Freezability

  • Semen freezability was then analyzed in the context of fertility. This was done with a subset of 40 stallions for whom both fertility and freezability data were available over a span of 5 years.
  • The data revealed a strong statistical relationship between the fertility of fresh semen and semen freezability.
  • However, the relationship between frozen semen’s fertility and freezability was not as clear.

Field Fertility Results

  • The researchers also looked at field fertility results. This means they analyzed data from mares who were bred using the frozen semen.
  • The results showed that mares inseminated multiple times during their estrus (or fertility cycle) had better fertility rates compared to those inseminated only once.
  • Foaling rate (how many mares actually gave birth) was found to be influenced by the mare’s age, with mares under 16 years old having a higher rate than those 16 or older.
  • The date of the first insemination also affected foaling rate. Mares inseminated before May 15 showed a significantly higher foaling rate than those inseminated afterwards.

Conclusion

  • This study suggests that there is a strong relationship between the fertility of fresh stallion semen and its ability to be successfully frozen for later use.
  • However, the relationship between the fertility of frozen semen and its freezability is less clear.
  • The research also indicates that mare age and insemination timing have significant impacts on successful foaling.

Cite This Article

APA
Vidament M, Dupere AM, Julienne P, Evain A, Noue P, Palmer E. (2006). Equine frozen semen: freezability and fertility field results. Theriogenology, 48(6), 907-917. https://doi.org/10.1016/s0093-691x(97)00319-1

Publication

Theriogenology
ISSN: 0093-691X
NlmUniqueID: 0421510
Country: United States
Language: English
Volume: 48
Issue: 6
Pages: 907-917

Researcher Affiliations

Vidament, M
  • Horse Institute, National Studs and I.N.R.A. 37380 Nouzilly, France.
Dupere, A M
    Julienne, P
      Evain, A
        Noue, P
          Palmer, E

            Citations

            This article has been cited 15 times.
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