Holstein breeding is a truly international industry. Thousands of bulls enter AI studs around the globe every year. How do you know which ones are the best for your breeding program? Interbull enables countries to present proofs of bulls from all around the world on their own national scale. A criticism we hear most often from breeders is that the feet & leg proofs don’t appear to be a good reflection of a bull’s scores from his home country, so just how valuable are these index conversions?