Yesterday I turned out some first calf heifers and their calves into big pasture. They had been in a small pasture close to the barn and had some shade. Upon checking on them I noticed one that was panting like a dog. The weather was sunny ( low 80's and humid). This particular calf was full of life before we turned them out. Now it is sluggish and seems to have been set back a bit. I brought her and her momma back into the barnyard last evening. Has anyone else ever had this occur with their calves. The calves are only a few days old and I like to keep them close to the barn so I can keep an eye on them.