I have a 5 year old cow that has the right side of her face swollen. She was seen eating prickly pear cactus, could this be the reason? It was noticed not long after that. I gave her tetracycline powder in her feed, but didn't help. Haven't tried a shot of antibiotics. She's been like this awhile now, someone said lumpy jaw and very hard to cure. I doubt she's bred, should I cut my losses and sell her? Thanks for any help.