In your report, it is dairy heifers and they are being sold by the head. That is about what dairy heifers are going for right now. So, their best 130 lb heifer calf brought 535 dollars for the calf at that sale.
Back to farm means anything that is going back to the farm as a replacement. For instance a dairy heifer, or a beef cow, or a dairy cow, or even a beef heifer, or a bull good enough to go back to the farm as a breeder. Animals that would not be back to farm would be feeder calves, steers, slaughter cows, slaughter bulls, feeder cows, or freemartin heifers.