Fertility of frozen equine semen.
Abstract: Semen of 16 stallions collected by the fractionated method and frozen in liquid nitrogen was used to inseminate 175 mares of different ages and in various reproductive conditions. Pregnancy was recorded in 91 mares of which 72 delivered a foal. Pregnancy followed by resorption occurred in another 10 mares and 9 aborted. The best results were obtained in the young primiparous and in older mares inseminated in the oestrous cycle that followed the post-partum oestrus. Overall, 64% of mares became pregnant and 56% gave birth to a living foal. The highest occurrence of fetal death and resorption were recorded in mares inseminated in the first post-partum oestrus.
Publication Date: 1982-01-01 PubMed ID: 6962886
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- Journal Article
Summary
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This research observes the effectiveness of artificial insemination by using frozen horse semen. It concludes that the process resulted in about 64% pregnancies and 56% successful deliveries, with the best results achieved in young first-time mares and older mares who were inseminated post-partum.
Methodology
- The study used semen from 16 different stallions. This semen was collected using the fractionated method, a process that separates the sperm-rich fraction from the rest of the ejaculate.
- The semen was then frozen in liquid nitrogen for later use.
- 175 different mares, of varying ages and reproductive conditions, were inseminated using the frozen semen. The aim was to observe how successful the insemination would be across these various conditions.
Findings
- Following the insemination, pregnancies were recorded in 91 of the mares and out of these, 72 were successfully able to deliver a foal. This indicates a pregnancy rate of approximately 64%, and a successful delivery rate of approximately 56% of the total mares inseminated.
- There were complications in some cases; resorption (a process by which the body absorbs the fetus) occurred in 10 mares, and 9 others aborted.
- The study found that the most successful results were achieved with young mares having their first reproduction (primiparous mares) and with older mares who were inseminated during the oestrous cycle that followed post-partum oestrus.
Complications and Limitations
- The research found that the highest occurrence of complications, specifically fetal death and resorption, occurred in mares that were inseminated during the first post-partum oestrus. This suggests that timing of insemination post-partum is crucial for successful reproduction.
Conclusion
- The research concluded that artificial insemination using frozen horse semen can be effective, if used at the right timing and conditions. However, further research is needed to lessen complications, such as fetal death and resorption, that occurred in mares inseminated during the first post-partum oestrus.
Cite This Article
APA
Müller Z.
(1982).
Fertility of frozen equine semen.
J Reprod Fertil Suppl, 32, 47-51.
Publication
Researcher Affiliations
MeSH Terms
- Animals
- Female
- Fertility
- Fertilization
- Freezing
- Horses / physiology
- Male
- Pregnancy
- Semen Preservation
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