Reposting in better section: What's the average size of a normal crop?

scubagirlwonder

In the Brooder
8 Years
Jul 19, 2011
70
4
41
Sammamish, WA
Hi all!
A few days ago I posted a thread about my chicken Petunia and this funny head-bobbing thing she does. Many of you said to check her crop; that it looks like something a chicken does when she's trying to move stuff through her crop/ or that she might be trying to "grind" food in her crop. I had thought it was just a silly behavioral thing (since she's always been a bit of a peculiar girl), and not something related to a physical ailment...so you all got me wondering.
So I just went out and grabbed her and felt/massaged her crop. The problem is...I don't know what it's supposed to feel like, so I really have no basis for comparison!
Here's what I felt:
1) a crop about the size of a racquetball (smaller than a tennis ball, bigger than a golf ball),
2) it was semi-firm, but pliable (it didn't feel hard in any way, just felt like a toned muscle rather than a floppy, squishy sac),
3) Petunia didn't fight me or appear in any discomfort as I did it,
4) I could not feel any lumps or hard objects,
5) Nothing "came up" as I was massaging (no fluids or solid pieces),
6) I gently opened her mouth and did not smell anything sour or malodorous (had read about "sour crop" in my research).

So, my questions are:
What's the normal size of an empty crop?
What is the average size of a crop when the chicken has been doing her "normal" thing (since I checked her crop in the middle of the afternoon)? (I'll check it again first thing in the morning...)
What should a normal crop feel like?

Is all this worrying for nothing? She's acting pretty normal, other than she hasn't been laying any eggs for a bit and the silly head thing she's doing. She seems to be eating adequately (she's not skinny/hasn't lost any weight that I can tell) She is active; loves her dust baths, she's not lethargic, her feathers look shiny and nice, eyes are clear and alert and she's not being picked on by anybody...what do you think?
 
Crop sizes vary.... I have a large 10 pound rooster that only has a golf ball size crop when it is full, and some bantams that have very large crops.
 

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