Just skimmed through the last hundreds of posts, corn was brought up, corn in winter, we get cold, not super duper cold but many weeks of zero F way below sometimes, months, weeks of -20 windchill. I don't feed any corn, 'scratch' or any 'treats'. Unless your buying corn free feed, I'm pretty sure most feeds are pretty heavy on it, so why add? All the birds we cull even in the dead of cold winter are....FAT...
I don't think they need more corn.
A little 'did you know'? Colored 'Indian'corn , certain varieties anyways has 2-3 times the protein and many more vitamins and minerals than the factory corn that is available?