OKLAHOMA CITY — Feeder cattle prices at the Oklahoma National Stockyards took a modest dip the week of June 16, as heat, humidity, and unweaned calves softened buyer enthusiasm despite a strong overall supply.Compared to the previous week, feeder steers sold steady to $3 lower, while feeder heifers held mostly steady. Calves, especially unweaned or short-weaned lots, saw a sharper decl...