Hi
I also found this - which is what I used. Good Luck
Treatment for Crop Bound
The earlier that you discover the problem the easier it will be to solve. First put the bird in a pen that will not allow him access to any food including grass and dirt . Take some ordinary plain
( unflavored ) yogurt and mix it with some cool water to make it syringeable and squirt it down his throat several times a day . You might want to mix a small amount of Vit& Elec with it as well . Massage the crop vigorously to mix the contents with the yogurt . Keep doing this until he starts to pass the feed. He should be cleaned out within 24 hours . Next take a hard boiled egg and mix the yogurt with it and feed it to him for the next 24 hours. When he is passing this feed without any problem bring him back on a mixture of the feed that you normally feed mixed with the hard boiled egg and the yogurt until over a few days he is eating and passing the feed without difficulty. Then put him on his regular feed. During this time the bird must have plenty of fresh water with Vit&Elec in it as well.
Stay away from using bread,milk,and oils as they are hard to digest at this time when the digestive system is under such stress.
Sour crop is caused by an infection in the crop. The crop will feel squishy and the breath will smell badly.
Sour Crop: the hard facts
The Chook Doctor explains:
[Sour Crop] is a common problem with hens, especially if they are allowed to graze on grass when they are first released. These birds are not used to eating such natural foods, so they tend not to know how to do it properly. Long strands of grass in the crops of such birds often are unable to pass through the digestive system, [so they] bind in the crop and ferment.
The Chook Doctor
A quick method of telling whether a chicken has Sour Crop or not is to gently squeeze it and sniff the air thats expelled from its mouth. If the bird has Sour Crop then the air will smell awful, if not well, I dont suppose a chicken smells very nice anyway, but apparently la diffrence dodeur is marked. (Of course, sniffing chickens is also one of the eight sure-fire ways of being marked down as a looney, but well put that aside for the moment.)
Fear not, help is at hand
Luckily for you my mother has a cure for Sour Crop. First she grabs you (this isnt hard because youre just lying there burping), then she sticks a tube down your throat, and pours a mixture of yogurt and olive oil into you.
That done, she takes hold of your feet, hangs you upside down, and massages your stomach and crop until lots of green and white muck comes pouring out of you.
Finally she flips you the right way up, pats you on the head, and puts you down. You ruffle your feathers, squawk a bit, ruffle your feathers some more, and then walk off in as dignified a manner as you can muster.
Its a tough life, being a chicken.