Freemartin

Quick Summary

A freemartin is defined as a female that is born as a twin with a male and is sterile as a result of exposure to masculinizing hormones.

A freemartin is defined as a female that is born as a twin with a male and is sterile as a result of exposure to masculinizing hormones. A connection between the two fetal circulatory systems develops early in gestation (anastomosis) and leads to the exchange of blood between the fetuses. Exposure to male hormones leads to underdevelopment of the female's reproductive tract.

Price

$50 one test per animal

Additional Details

Incidence of freemartinism in sheep is generally low (about 1%), but increased risk has been observed when litter sizes are four or more. A DNA test that detects presence of Y-chromosome is available to confirm chimerism in the blood of females suspected of being freemartins.

Turnaround Time
2-6 business days
Type of Sample
Blood

Species

References

Padula, A.M. (2005). The freemartin syndrome: an update. Animal Reproduction Science, 87, 93-109. doi: 10.1016/j.anireprosci.2004.09.008