i am trying to figure out why my hens aren't laying at all

[Cherie1425]

I have 5 guineas, 28 chickens, and 6 ducks (in seprate pen right now so they are warmer). None of them have laid an egg since october. I have been feeding them a Nutruna Country Feeds All Flock 18% pellets. They also have a heated water bowl. They get Oyster Shell Calcuim 3 times a week sprinkled on the ground in the 30 ft long by 24 ft wide pen. They have a 6wide by 12 long coop attached to this pen. We have a heat light in there and on 24/7 durning the cold weather. Is there anything I can do to get them to restart laying eggs? any suggests would be help full.

 

[sumi]

Guineas stop laying in the fall (October) and start laying again in Spring. Ducks generally lay from late winter through to early summer and, though us humans have tried our best to breed it out of them, many chicken breeds also stop laying over the winter months when the days get shorter (they need around 14+ hours to keep them in production).