Table 1.

Description of broiler chickens used in the experiment

Group no	n birds	Replicates (pen x birds)	Addition in litter* (kg/m2)	Addition in feed
1	100	10 × 10	None	None
2	100	10 × 10	0.800 h1	halloysite and zeolite to feed in proportion 25:75; starter, 0.5%; grower 1, 1%; grower 2, 1.5%; finisher, 2%
3	100	10 × 10	0.400 h / 0.400 z2
4	100	10 × 10	0.800 h
5	100	10 × 10	0.200 h / 0.600 z

^1, h, halloysite; ², z, zeolite

*, weight per treatment; aluminosilicates were applied on 5 dates: days 1, 10, 20, 30, 35 of rearing