Posted by John in La on November 26, 2017 at 20:37:40 from (68.185.230.243):
In Reply to: Twin calf question posted by Brown Swiss on November 26, 2017 at 18:22:40:
A freemartin is the result of a fusion of the two placentas early in the gestation. Usually in the first month. The common supply of blood allows a exchange of hormones between the two calves. Since testicular development occurs before ovarian development it messes with the heifer developing correctly. So it does not matter which one is dominate or bigger. If the hormone exchange is there early enough there will be problems with development.
This happens in about 90% of the cases with male/female calves. The female will be sterile and the male while not sterile can have reduced fertility.
In about 10% of the cases the placenta will not fuse or it will fuse late in the gestation. In these cases both calves will be normal.
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