While more and more suckler farmers are breeding their own replacements, there are still plenty of herd owners who purchase maiden heifers or in-calf females through weekly mart sales, at special breeding sales, or directly from other farms. Depending on the farm system, there are merits to both options. For example, in small herds where calves are traditionally sold as weanlings, purchasing in-calf heifers allows herd owners to operate a simple system using one terminal stock bull to maximise sale weight and value of calves. But for larger herds with two or more stock bulls, there is the option to run at least one bull with more maternal traits, with the purpose of breeding replacement heifers.