Work Experience: Dairy Farm

The two calves.

I found out that when twins of both sexes are born, the female calf's reproductive organs don't form properly. Therefore farmers don't want twins of both sexes. If the twins are two girls, the reproductive organs form normally in both.

Farmers call the female twin a "Free Martin". I was told that the farmers don't know why this happens and I haven't been able to find any information on this either. If anyone knows why the reproductive organs don't form properly please let me know. 

We were worming and  vaccinating 150 calves for black leg, in the barn, where there was a Free Martin. I was given the opportunity to examine the calf and see for myself the difference between a Free Martin and a properly formed female calf. 

This photo was taken about 10 minutes after the calves were born.