Relationship between early pregnancy site in consecutive gestations in mares.

This research article studies the early pregnancy site in consecutive gestations in mares, revealing that the second pregnancy is usually situated in the opposite uterine horn to the first, regardless of how long it takes from birth to conception.

Objective and Methodology

• The study aims to understand the link between early pregnancy site in consecutive pregnancies in mares.
• The researchers examined the records of 200 pairs of consecutive pregnancies in mares.

Findings

• The observation found that in 82% of cases, irrespective of the parturition (birth) to conception interval, the second pregnancy was primarily established in the uterine horn opposite to that of the first.
• The same relationship was observed when the first pregnancy ended in abortion after 140 days.
• This pattern did not hold if the first pregnancy terminated before 140 days.

Conclusion and Implications

• The report concludes that there is a marked tendency for the second pregnancy in a mare to be established in the opposite uterine horn to the first, specifically when the first pregnancy was carried for more than 140 days.
• This discovery provides insight into mare reproduction patterns and can be helpful in breeding programs.