A bull is commonly regarded as “half the herd” because it contributes about 50 per cent to the herd’s genetic and reproductive outcome. In the era of artificial insemination, the selection of genetically superior bulls has become even more critical, as most genetic progress within a population is achieved through the use of well-chosen sires.
Bhautik N. Saripadiya, Kiran H. Parmar, Dinesh V. Chaudhari (Wed,) studied this question.