Check the chicken for sour crop or impacted crop.
Sour crop: The crop will feel very squishy and there is a foul smell coming from the chicken’s beak. * Wrap the chicken in a towel or blanket (to keep it calm) and gently tilt the chicken forward (not backward) so that her body is vertical to the floor and the head is close to the ground while massaging the crop contents gently toward her mouth. You may need to open the beak to allow the vomit to flow out. The chicken should remain upside down for short durations only – 15 to 20 seconds maximum. Repeat one to two times only.
Impacted crop: The crop will feel much harder than a sour crop. With an eyedropper, apply of small amount of organic vegetable oil (do not use petroleum-based oils) mixed with water into the chicken’s beak may be used to help lubricate the crop contents. However, it is vitally important to ensure the liquid is inserted well past the small hole at the base of the tongue that leads to the hen’s lungs.
Once the oil is added, the crop can be gently massaged in a downward motion to help further lubricate the crop and move the blockage through the hen. This may take several applications over the course of two days.