acv in water and some oil, either syringed or in feed might help. whole BOSS as well.Glad to hear Antonio is doing better. Heavy birds just aren't graceful with their landings off a high roost. One of my sussex cockerels flew off the top of the nestbox attached to the outside of their coop and didn't stick his landing quite right and did a sort of nose dive somersault. He of course jumped up in a hurry and shook it off trying to pretend nothing ever happened. I nearly split my side with laughter, and I'm sure the girls in the coop were just as amused.
For roosts, 18" to 2 feet off the ground is plenty high enough for heavy breeds. The issue becomes making sure any nest boxes are lower than the roosts or they will attempt to roost in or on top of nest boxes trying to get as high up as they can get.
My FRF cockerel #2's crop never would completely 100% empty. Most of the contents emptied out and he would pass any soft foods or liquids he was fed so it isn't a complete obstruction. I had been feeding him boiled eggs and yogurt with probiotics and he enjoyed it very much. He hasn't lost his appetite. Each day as I checked on him while he was in the holding pen when he should have been empty, he still had the same small mass of solid objects left in his crop. A movable clump of what feels like small stones. The clump feels about the size of a kiwi but it went down a great deal compared to the orange sized mass of feed and whatever else he originally had in there. I'm only assuming they are small stones that he has eaten because they feel rigid and larger than corn or grain. He eats the weirdest things like mud and dirt, so it wouldn't surprise me if I opened him up to find a small collection of rocks in his crop. The objects are too large to be passed on out of his crop and into his digestive system I guess. I decided to stop treating him and put him back in the coop with the others. He isn't starving and any food he is fed is slowly being digested so I will just watch him and see how he does. He continues to eat and drink fine, and his droppings are normal. The rocks may break up on their own and eventually pass. He remains vigorous with no outward signs of illness so the issue doesn't seem to be bothering him much. Aside from opening his crop up and removing the objects, there isn't much more I can do for him. And I really don't want to put him through that. We don't take our chickens to the vet so if he gets sick or stops eating we will probably just cull him.
He got used to his daily crop massages and extra TLC and would nearly hop into my arms from the holding pen he was in. He is a very sweet boy so I hope I don't lose him.