Originally conceived as a commercial heifer development program, the Southern Heifer Development Program primarily consists of registered heifers. In fact, many bull consignors also consign heifers and use the program as a means to maintain larger contemporary groups to improve the utility of collected performance data. Heifers are developed on a silage-based ration targeting moderate growth rates. Breeders must market 25 percent of consigned females should they qualify for sale. Approximately 115 heifers are accepted for evaluation annually.