Three days ago I put my 4 1/2 week old various chicks outside during the day into their grow pen in the front yard so I can watch them, then they come back inside to their brooder for the night. We just put fresh shavings in the brooder 2 days ago, but this morning noticed that their poo is much more odiferous than before they started eating grass, bugs, and worms. Has anyone else noticed this? I gave them chick grit todaysince they are eating more than chick feed and scrambled chopped eggs.