A crop surgery will be performed
without any anaesthesia whatsoever and any willing vet should be able to do it. The only important things to consider are:
- Not to cut into the big blood vessel that can be seen right in front of the crop.
- After removing all contents also check the passage to the gastro-esophageal vestibule, flush thoroughly and be careful not to stitch/glue the crop to the skin, as this would impede a proper functionality.
This should not take more than 10-15 minutes and the chicken usually is quite cooperative if wrapped in a towel to prevent wing flapping.
Mine all survived the procedure and recovered.