More likely the warmer weather than the food - unless the new food has significantly more protein.0 today but im in south east Wisconsin one of my girls has been laying sporadically since last week already! Often small fairy eggs but one really large one. My girls will be 5 this spring so I was really surprised that they started so early especially since the first egg last year wasn't until mid March.
I'm thinking its either due to the mild winter we've had and/or switching them from dumor feed to Kalmbach waterfowl.