I have a question about the snake possibility. We too, have had some eggs disappear. My husband has said there is no way a snake could get in our coop/run. He has gone over it and over it. My question is though, even if a snake found a small hole he was able to get in through, how would he get OUT, after swallowing the egg? You would have to have a pretty good hole for that to happen, right??!!
Actually, this may sound incredible but some egg-eating snakes are able to crack the egg internally. I don't know how (or which snakes) do it, whether they use a specialized rib bone or contract their muscles, but I saw it on a nature documentary and the video was amazing. The snake swallows the egg, then you can see the egg shaped bulge constrict and the egg is broken internally. Later the snake sometimes passes the shell as a pellet. Pretty amazing, eh?
Just candled the remaining eggs, all embryos were dead. All eggs were about have filled with a runny fluid, I'm guessing the heat evaporated much of it and caused the embryos to die. I threw all the eggs away and took the broody out and locked her out of her nest. How long does it take to break a broody???
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Hmm...you have a point there....but the snake could possibly hang out in the coop until he has digested the egg more until he's slim enough to go out the way he entered. Altough that does seem a little unreal
I also had a similar issue, and so has a friend.
Once, a rat had a hold of a fertile egg that the broody was on.
Now, my friend has had another hen eat up 3 out of 10 eggs when the broody hen was off the eggs for her "break".