Another update. I think my rooster might be fighting off some kind of infection. After looking at his scan the vet noticed he has an enlarged spleen (which helps support immune function) and his upper gi tract seems to be constricted. I'm thinking it might be due to inflammation. I've got an antibiotic for him and will be massaging him more regularly to get things moving through his system. He is maintaining his weight around 5 lbs. So he's under weight but on the bright side he isn't losing any more at the moment. I'm also going to be putting the crop bra back on tonight. He always makes such a fuss about it but it's for his own good. Thank you for listening and the help you all have given so far.