I have a hens with a range of brood sizes in terms of how many chicks they have. Lowest is 3 while highest is 22. The more chicks, especially during the first week or so, more time spent foraging with less for hiding under moms wings. The hen with largest brood is goaded by cheeping chicks almost continuously so she does not rest. Crops also not filling. That settle down when I bring chick feed. Brood of 12 chicks forages for longer bouts than so the smaller broods. Broods of six not obviously different from three.