Our chickens free range, and we haven't been giving them scratch since their pre-egg-laying days. It sounds like it's a good idea to give them scratch over the winter for added warmth overnight and to replace the extra calories they burn keeping warm. How should we give it to them? Just mixed with regular food - and if so, in what ratio? Or thrown on the ground in their coop--I'm having a hard time imagining it mixed in with pine shavings...? It sounds like it's best to give it at night...any tips would be appreciated. Thanks.