How many cows can a bull impregnate in 8 hours?

It is important that you do not over work the bull, usually in a period of 8 hours about 3-5 is a good number for older bulls.

For a better understanding, the ideal bull to cow ratio would be for yearling bulls 15-20 cows. 2 year old bulls 20-30 cows; and for 3 year old or older 30-40. This ratio is usually for pasture breeding, when the cows and bull are turned out for the summer months when the bull will then breed them as they cycle.