One of our 4 month old heifers has been looking depressed and not gaining like the other heifers. She is not showing signs of any lung or digestive aliments. We wormed her with injectible wormer a couple of week ago hoping this would help. Today, we roped her and she had 102.8 temperature. Gave her 12 cc of Nuflor. She doesn't seem ill other than looking a little depressed. Any suggestion on what it could be or what we should try next? We will take her to the vet next Saturday or sooner if she doesn't improve.