I just had a really nasty bout of a bacterial infection with my flock that I (and the state poultry lab) thought might be Avian flu-- it managed to take out two of my girls within hours of one another, and its pretty incredible that the others bounced back! While dosing them with antibiotics, I also realized that quite a few are skinnier than I'd like. It's very possible it's worms, so I'm going to dose them with invermectin pour-on drops once the vet confirms they're healthy enough for it (we're already having to toss eggs because of the antibiotics they're taking anyway), but I also worry that I've been accidentally underfeeding-- we had a rat problem that I didn't know about until recently, so while I THOUGHT they were going through a normal amount of food, it's very possible the rats were getting the lions share. All that's to say-- I want to put weight on my girls as quickly and healthily as possible. I've been giving them their regular food along with mash from a friend's homebrew operation, but I'm wondering what the most calorie-dense option is. Thoughts? I've got Kaytee parrot hand feed mix that I use on very sick birds, for what it's worth, but I'm open to other (and less expensive) suggestions as well!