well, they do get broody and with the temperature rise it produces what to stop them from laying? so yes there can be something in the feed and testing for things other than FEED Values is where to look if you are going to look,Total chemical make up. Look at the source of individual...
well, i don't use one type of feed anyway and use a mineral supplement once a week. They get half flock raiser crumble and half ten way show stopper grain. once a week they get some manna calf pro one day and some soybean meal another day.
Well who cares about the % specifications of protein, fat, fiber, minerals... Whats in the feed that is NOT these things that would put them off laying. For that matter, What can put them off laying if eaten? Thats is what to test for.