Yes, because your layer feed is about 16% protein and oats are about 10%.
Warm oatmeal will not give them more energy.
Where are you located that the 30's are 'cold'?
I like to feed a flock raiser/grower/finisher 20% protein crumble full time to all ages and genders, as non-layers(chicks, males and molting birds) do not need the extra calcium that is in layer feed and chicks and molters can use the extra protein. Makes life much simpler to store and distribute one type of chow that everyone can eat. I do grind up the crumbles (in the blender) for the chicks for the first week or so.
The higher protein crumble also offsets the 8% protein scratch grains and other kitchen/garden scraps I like to offer. I adjust the amounts of other feeds to get the protein levels desired with varying situations.
Calcium should be available at all times for the layers, I use oyster shell mixed with rinsed, dried, crushed chicken egg shells in a separate container.
Animal protein (a freshly trapped mouse, mealworms, a little cheese - beware the salt content, meat scraps) is provided once in while and during molting and/or if I see any feather eating.
