Hornless dairy cattle, otherwise known as polled cattle, have been preferred over horned animals for decades. For this reason, it has been common herd management practise in most developed countries to dehorn animals when they are young. Methods for dehorning have traditionally aimed at minimizing any pain to the animal. Nevertheless, interest in applying genetic selection in favour of the “polled” gene has grown significantly in recent years even though the presence of such a gene in dairy cattle has been known for over 70 years.
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