NancyNurseCxMama
Songster
I understand your concern but the ones who are taking it are getting very close to laying---redder combs and wattles, squatting when I touch their backs, and their pelvic bones are now two fingers apart. They are also the ones kicking around the ceramic eggs in the nesting boxes. They are going on twenty weeks old.If they are still on chick feed, I wouldn't offer them OS, depending on their age, their kidneys are still developing and you don't want additional calcium until they lay their first egg.
The others that appear to be further from POL aren't touching the stuff.
Even the three that are showing interest are only picking occasionally.
I wish they would all start laying and then I'd switch to layer feed and be done with it but I do not want to give the increased calcium to all my girls, for the reasons you brought up. But the starter feed is woefully deficient in calcium for a laying bird.