Check the legs on that Marans,,,,, are they YELLOW?
you need to condition them some how to the lower temps. I take mine from a warm brooder room at 4-5 weeks after lower the heat every week. To a heat brooder in a uninsulated barn. I usually grow them out there for 3-4 week and may remove the heat during that time. I have a top on that brooder and can open or close it based on the temps. the next brooder has not heat or top so they are on their own. I don't usually move mine out side till they are 3 months old. I tried one year to move them out EARLY and lost a bunch because they roosted on the ground and got too cold.
KNOWING how to roost helps TONS. It sounds like you are doing ok and might only want to add heat on cold nights for a month. BUT that is just me.
Do not take them from 70 to 30 without weaning them off heat.
you need to condition them some how to the lower temps. I take mine from a warm brooder room at 4-5 weeks after lower the heat every week. To a heat brooder in a uninsulated barn. I usually grow them out there for 3-4 week and may remove the heat during that time. I have a top on that brooder and can open or close it based on the temps. the next brooder has not heat or top so they are on their own. I don't usually move mine out side till they are 3 months old. I tried one year to move them out EARLY and lost a bunch because they roosted on the ground and got too cold.
KNOWING how to roost helps TONS. It sounds like you are doing ok and might only want to add heat on cold nights for a month. BUT that is just me.
Do not take them from 70 to 30 without weaning them off heat.