I used golf balls and had success with that. Right up until a bird went broody and tried so hard to hatch the golf balls while pushing the real eggs away.
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I didn't read all 21 pages from this thread but I had a question maybe some one can answer. So one of my chickens has started laying pullet eggs so far 8 eggs in 8 days, so my question is this do you know if leaving an egg or few eggs in the nest box will encourage my other girls to use the nest box or start laying eggs also? I noticed only 1 of the 3 nest boxes were being used so I moved one of the eggs to the next nest box over to see if my pullet would use the newly occupied nest box and sure enough the next day the I found a second egg in the newly occupied nest box. So is it a good idea to keep one egg in each next box to try and keep them using all of the nest boxes? And does it encourage the chickens to lay and or use the nest boxes if a I keep a few eggs in them?
Thanks for the comment, I'm not really worried about the eggs going bad in the nest box this time of the year its colder with temps around 45*-60* Fahrenheit in the coop and since the eggs are not rinsed they have that protective bloom coating and they can last days or even weeks if i wanted to without refrigeration. But to keep them fresh I have been just leaving 1 egg in each box and change them every other day. Also my chickens seem to mainly sleep/roost on the perch and only use the nest boxes when laying so the nest boxes keep real clean.Don't leave the chickens' eggs in the nests to encourage others, you don't want them going bad. Use fake eggs. I have mismatched plastic Easter eggs with a small rock inside (so they mimic the weight of a real egg) in each nest. If you have a community box, don't be surprised to find they move all the eggs into the same place then lay their egg in the pile.
My birds have favorite nests and yes some like the same one as another bird and really don't want to use another if "their" box is in use.
I have never left a real egg in the nests and the girls that go broody still go broody. Once broody they will be happy to try to hatch the plastic egg in the nest. They will be happy to try and hatch the wood shavings when I take the egg out. I had one that thawed 2 refreezable ice packs sequentially in a day. The only way I know to break them is the broody buster box up on the roosts. Just have to wait out their hormones and hope the lack of ability to keep their underparts hot speeds up that process.Thank you bruceha2000 & KieksterChicken for your comments I agree leaving real eggs inside the nest boxes to encourage other hens to use the boxes increases the chances of teaching chickens bad habits of eating eggs and I also understand it can make a hen go broody and that is also bad, that is why I was asking. Those are two good reasons not to leave your eggs in the nest boxes to encourage other hens to use the box. As I said in my previous comment they will not just go bad in the nest box because its cold enough to keep them preserved for several weeks just at room temp. Anyways thank you again for the comments that's why I asked. I made some eggs up for breakfast they had great flavor and there shells where nice and thick. So thick in fact I accidentally dropped one and the fall put a dent in the egg shell but did not break it, so i cooked it immediately and it was all good.