OKLAHOMA CITY — Slaughter cow and bull prices climbed sharply at the June 10 auction at the Oklahoma National Stockyards, driven by heavy competition from both packers and stocker buyers looking to fill pastures and feedlots as summer grazing intensifies.Slaughter cows sold $4–$6 higher on the week, while slaughter bulls gained $3–$4 per hundredweight. The strongest demand was seen...