I didn't fancy eating my placentae at the time (we did watch the River Cottage episode though), but we buried them and planted trees on top. Both trees have not been doing too well, lol, but the kids are ok, that's the main thing!
Back to the eggs and hens - we fed boiled egg yolk to fading ducklings for strength last year, yes, it is a great supplement for weak or recovering birds (didn't save all but one duckling) . But these hens I am enquiring about are well fed and thriving, from organic stock, fed with pellets, grain, kitchen scraps and are free range. My friend did try the mustard egg trick, but they just left those eggs alone and ate all the others...Any other suggestions to stop them are welcome.