Who did the cattle farmers sell their cattle to?

Other cattlemen or butchers.

There are no Cattle Farmers, they are called Cattle Ranchers, Farmers work the land for planting crops. Cattle are sold two ways, at a sale barn or by ranch sale. The sale barn have sales on weekly sales open to the public, ranch sales are held a ranch usually once a year and mostly by invitation, these cattle usually are registered breeds. Cattle sold at a sale barn may make several trips across the country before they make it to the meat market.