They need to be high and tight and a good circumference. A buck is 50% of your herd and better. You want those daughters to have well attached udders with a will to milk. Cattle people believe that the size of the scrotal is an indication of the milking ability of the daughters. We know the size of the scrotal is an indication of good reproduction too. Pay close attention to the conformation of the buck. You want him to be smooth and level across the top with a good extension of brisket. We are not looking for just a wide chest but one with an extension of brisket. Look for good width between those hind legs and good strong legs and feet. Don’t just breed your does to any buck but look for the best that you can find.