jhm47
True BYH Addict
A heifer calf can be born a single and still be a freemarten. I have found several of them in my AI work that the owners were positive that they were born singles. What happens is that they were conceived as twins, and the male calf died in utero and was resorbed by the cow. The male hormones that the male calf produced in the few weeks of sharing the uterus caused the heifer to become a freemarten.
It is very easy to tell if a calf is a freemarten. Take a lubricated pencil and insert it on a 45 degree angle into the vulva. If it goes in about 4 - 6 inches, she's not a freemarten. If it stops at about 2 - 3 inches she is one. Don't force the pencil, and be sure to use the blunt end with the eraser to probe the heifer. This works for very young calves. As they grow, you need to increase the # of inches that you insert the pencil.
Forgot to mention---After inserting the pencil at a 45 degree angle, you will need to raise the back end of the pencil up to parallel with the ground. If you continue at the 45 degree angle you will hit the top of the vulva and it will stop, giving the impression that she is a freemarten.
It is very easy to tell if a calf is a freemarten. Take a lubricated pencil and insert it on a 45 degree angle into the vulva. If it goes in about 4 - 6 inches, she's not a freemarten. If it stops at about 2 - 3 inches she is one. Don't force the pencil, and be sure to use the blunt end with the eraser to probe the heifer. This works for very young calves. As they grow, you need to increase the # of inches that you insert the pencil.
Forgot to mention---After inserting the pencil at a 45 degree angle, you will need to raise the back end of the pencil up to parallel with the ground. If you continue at the 45 degree angle you will hit the top of the vulva and it will stop, giving the impression that she is a freemarten.