chiefgriz":638qpm5b said:"A sterile or otherwise sexually imperfect female calf born as the twin of a bull calf. " It appears as though even if the heifer can concieve, she still could be considered a freemartin if some of her sexual organs were imperfect. The question is, does any heifer born twin with a bull have all the correct parts and is capable of concieving. The 90% everyone keeps bringing up just refers to the calf being sterile.
Not all twin calves share the same placenta. Those that don;t, about 10%, are not sterile. Freemartins cvan range anywhere from having a vestule penis to just insufficent hormones to maintain a pregnancy Those that do cycle and can conceive but don;t carry in the past were refered to as "functional freemartins", but I don;t know of any of them actaully being DNA tested to see if they were true freemartins from being exposed to the bulls hormones in the embryonic stage. Some are as obvious as a black bean in white cats butt, others the only way to tell for sure is to do a DNA test.
dun