I wonder what causes a hen to kill her chicks...I have chicks due to hatch in the next few days *fingers crossed* and she is first time broody so I'm a little worried. She is in the corner of a shed with only her friend another silkie and my unstable drunken roo. I just have my fingers crossed that I have a good hatch and she doesn't kill them.
Well it's been said, "Mothers of teenagers know why animals eat their young", but I don't think that applies to chickens.
I could be another bird that does it too. I pulled a chick from the CR / Orp coop because a CR hen pecked at the chick. That's why I traded it to Breella.
My best guess would be either a nutritional imbalance or fear for the chick. This is why it's best to always avoid messing about under her. There are of course exception like my Buckwheat. She don't mind me messing about. Never bites.
I usually candle at least once on day 7 - 10. Then they are on their own.
Some breeds just don't make good broody moms. I'd say the tops are Silkies, Cochins, Orps and Dels, or not depending on how you view things. EE's , BR's, Dom's and Sussex don't like you messing with the kids. Just stand back and let them do what they gotta do. At least this has been my experience.
I just let them sit and if they starve to death so be it. I don't advocate poking around under there. This last batch hatched when they hatched. I didn't mark the calender , I just left the girls to do their thing. I expect there might be a couple more in the next few days. Then I'll pull the unhatched eggs and toss them. I've plenty of chickens.
Stories book of breeds gives some insight into the personality of the breeds.