I am a new chicken parent and am trying to figure out the best way to give my new girls their Oyster shell. Should I mix it with their Grit or serve it by itself? Also how will they know to eat it? I am just trying to figure this all out as they are my first chickens. I currently give them a flock raiser type feed because I prefer the higher protein then what can be found in layer pellets. And I wanted to start giving my girls the extra calcium from the Oyster shell as I have a few that are about to start laying. Any and all help is appreciated!