I decided a while back not to. I have read of roosters who are ordinarily housed separately being fed a little higher protein feed, without the added calcium. Layer is fairly low protein -- again, i've read this is because commercial egg operations determined that they lay more eggs if protein isn't too high. And I have a mixed age flock; new chicks with their mamas are eating the same food that my layers and roosters are. I've always kept some oyster shell in a separate container, anyway, so I decided to switch to grower or starter / grower or flock raiser. Around here it has 2% or 3% higher protein. My hens are eating more oyster shell than they used to. I've ever seen a chick or rooster take any, even though I'm often out there 3 or 4 times a day and will sit and watch chicken TV if the weather isn't awful.
But people do what Al does all the time; I'm not saying it's wrong, and I did it myself for a couple of years when I didn't have young chicks around. I believe the extra calcium is more dangerous to immature birds than roosters, but I can't believe it is the best thing for roosters, either.
This is from opinions I've read, mostly on BYC, not scientific studies, and I don't have any sources to cite. So I could be all wet.