Unless he can see into the nests this is not a fool proof technique.
Might be time for an exam:
https://www.backyardchickens.com/articles/who-is-laying-and-who-is-not-butt-check.73309/
What is the protein and calcium percentages of this feed?
Is it in the form of mash, crumble, pellets or cracked grains?
Cut all this stuff out, no need or benefit.