Doesnt really matter how many he bred naturally. They are still jumping to be collected, some of these bulls go to stud for months and some get collected every day or every other day. How many bulls do that naturally? Plus they dont just work for a breeding season, they are collected throughout the year. Some of them, many of them, breed naturally during breeding season then go to stud in the off season while herd bulls would be resting for the next season. Plus as was stated on here earlier, these are terminal crossed bulls, they arent bred for longevity. Terminal crosses arent bred to even make it to 2 years, they are bred to have product and style and grow to a marketable weight and then go to the rail. All that being said a bull of a pedigree that wasnt bred to even last past 2 yrs making it to 6 doubled the life expectancy of most of his mates.