Multiple births in cows can have some disadvantages: they can lead to complications, it can be harder for the dam to go back in calf again and if the calves are of mixed gender, it is highly likely that the female is a freemartin which means she is infertile. This happens because the testosterone from the male calf in the womb renders the female infertile. It’s not always the case and we have had a mixed sex female twin heifer [...]
Did you know that a heifer (female) calf that is twin to a bull is almost certainly infertile? Apparently bovines are the only animals that this happens with – goats and sheep can have multiple births and all will be fertile.
The reason is that the testosterone in the womb from the male [...]