I have some 1 yr old hens that have been laying all winter. Right now they eat layer crumbles, but should I feed some "sctatch" for a complete diet?

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Hi I've tried "scratch feed" that resulted in egg yokes of store bought color. Found out that "Wild bird mix" produced a darker color yoke. After a while I noticed that there was a high percentage of red & white millet laying on the ground, going to waste. Not wanting to be paying for seeds the hens don't eat I started mixing my own scratch fee. Based on what they ate of the wild bird mix, & added whole oats & flax seed. Yolk color deepened nicely, to almost free range color & flavor. Eggs are now high in omega-3s and the hens love to eat all of the mix.