Herd expansion still relies on the profitability of the cow-calf sector, which is easy to forget with record cattle prices. Retaining heifers, though, is a slower route than keeping brood cows, and various factors including high beef prices have led to significant cow culling. Elements of Beef Expansion The Sterling Beef Profit Tracker shows that feedlot margins are $194.24 per head and packer margins are $49.39 per head on record beef cutout values. That was almost a doubling of the previous week's margins and a benefit of strong export demand. However, herd expansion still relies on the profitability of the cow-calf sector, which is easy to forget with record cattle prices. Feed costs are certainly down. However, profitability, especial...