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That is because it is not really a problem in chickens, unlike impacted crop. Did the vet take an x-ray? The gizzard can be seen with an x-ray or ultrasound. If your vet didn't do any imagery, then they were either confusing the gizzard and the crop, or you are confusing what they said. Or the vet is making a guess, but I am not sure why they would guess that as there are MANY reasons a bird might be skinny with scant droppings. Gizzard is inside the bird and really hard to feel from the outside.
The vet's opinion of 'it is only a chicken' is only valid if you agree. If you don't agree and you want a second vet opinion, find one that likes chickens, sees poultry on a semi-regular basis at least, and will treat it like a pet. If you agree that it is just a chicken, then cull and be done with it- as the resolution will not be an easy fix- you will need to work with this for days to weeks, and may still not have a happy resolution.
Gizzard: inside the bird, attached to the intestines- filled with grit/gravel, it grinds up hard food. Very muscular organ. The 'grinding stomach' Can get impacted in some bird like parrots due to underlying disease, not really a problem in chickens.
Crop: Between the mouth and stomach, basically a dilation in the esophagus- a skin bag to hold a large amount of food, which then slowly dribbles food into the stomach. Chickens can fill up their crop with a bunch of tasty food when they come across it, and the food is slowly fed to the rest of the GI tract over several hours. Easily felt at the base of the neck, more to the right. Impacted crop is a fairly common problem in chickens. Diagnosis is pretty easy- big crop, even after several hours of fasting (overnight is easy test). If this description fits with your bird- big crop that does not empty normally then keep reading:
Reasons why crop gets impacted:
1) Chicken eats a bunch of something non digestible like straw, wood chips, ect, or too much of something poorly digestible- like long pieces of grass or leaves. This material plugs up the outflow hole of the crop. They are hungry and eat, but very little can get out of the crop, crop fills up and gets stretched out, which can contribute to the problem of accumulating more junk. Giving chicken oils will probably not help with this- the non digestible junk need to be removed. Vet can do this with anesthesia and sew it back up, and help to provide special feeding instructions to get things going again. Do-it-youselfers will also sometimes attempt this with varying success. Care must be taken long term to not let the chicken have access to whatever it filled up with before.
2) Chicken ate something really rank, and the crop is 'sour' meaning has bacterial or yeast overgrowth, this is usually a big baggy fluid filled crop with minimal junk (hay, leaves, grass ect). Smells really bad. Unhappy crop loses it's ability to empty normally. These birds often feel pretty sick, and may not be trying to eat anymore. Vet would remove fluid with a tube and flush with saline until clean, and refill with electrolytes or very thin consistency food, give meds to decrease crop overgrowth and give you feeding directions. Do-it-yourselves have many recipes for cider washes, oil & massaging ect. Care needs to be taken to provide clean drinking water, non spoiled chicken snacks, good quality ration ect to help prevent recurrence.
3) chicken has some underlying problem that is hampering a normal GI tract emptying, and treating the crop will only be temporary.