. 2021 Aug 4;9:e11918. doi: 10.7717/peerj.11918

Table 4. Growth performance of broiler chickens during the 42 days of rearing.

Parameter² n=100 per group	Group¹					SEM	p-value	F-value	R²(adj.)
	1	2	3	4	5
BW (g)
1-day-old chicks	36.48	35.68	36.32	36.67	36.76	0.12	0.059	2.97	0.14
day 10	329.09	337.73	345.45	345.27	331.02	2.41	0.079	2.25	0.09
day 22	1015.32^c	1107.07^b	1138.98^a	1102.85^b	1020.12^c	10.05	<0.001	11.40	0.46
day 35	2147.18^c	2411.07^ab	2496.17^ab	2501.10^a	2342.00^b	23.80	<0.001	17.65	0.58
day 42	2604.03^d	2917.02^bc	3061.48^a	3041.89^ab	2893.07^c	26.84	<0.001	35.53	0.74
BWG (g)
days 1–10	292.61	302.05	309.13	308.60	294.26	2.38	0.069	2.35	0.10
days 11–22	686.23^c	769.34^a	793.53^a	757.58^ab	689.09^bc	9.05	<0.001	10.15	0.43
days 23–35	1131.86^b	1304.00^a	1357.19^a	1398.25^a	1321.88^a	20.47	<0.001	7.68	0.35
days 36–42	456.86	505.96	565.32	540.79	551.07	16.62	0.245	1.41	0.13
days 1–42	2567.55^d	2881.34^bc	3025.16^a	3005.22^ab	2856.31^c	26.85	<0.001	35.48	0.74
FI (g; per bird)
days 1–10	315.74	321.90	339.64	324.77	332.87	3.04	0.101	2.07	0.08
days 11–22	1011.11	1022.22	1011.11	1033.33	1011.11	5.82	0.691	0.56	0.14
days 23–35	1881.83^c	2276.20^a	2184.76^ab	2313.99^a	1997.76^bc	30.12	<0.001	18.04	0.58
days 36–42	844.89^b	868.51^b	1097.82^a	1098.51^a	1011.62^a	20.17	<0.001	16.67	0.56
days 1–42	4318.06^d	4539.73^abcd	4773.13^bc	4971.71^ab	4466.68^cd	54.19	<0.001	6.68	0.32
FCR (kg/kg)
days 1–10	1.08	1.07	1.10	1.05	1.14	0.01	0.149	1.78	0.06
days 11–22	1.48^a	1.33^bc	1.27^c	1.38^abc	1.47^ab	0.02	<0.001	7.49	0.35
days 23–35	1.66	1.75	1.61	1.66	1.54	0.03	0.102	2.06	0.08
days 36–42	1.87	1.79	2.06	2.12	1.95	0.07	0.591	0.71	0.10
days 1–42	1.68	1.58	1.58	1.66	1.56	0.01	0.058	3.01	0.14

Notes.

a, b, c, d, means in the same line with no common superscript differ between groups (p < 0.05); SEM, standard error of the mean; R²(adj.), adjusted coefficient of determination.

1, no addition of aluminosilicates to feed and litter; 2, 0.95 kg/m² of halloysite in litter; 3, 0.475 kg/m² of halloysite and 0.475 kg/m² of zeolite in litter; 4, 0.95 kg/m² of zeolite in litter; 5, 0.25 kg/m² of halloysite and 0.7 kg/m² of zeolite in litter; groups 2–4, addition of halloysite and zeolite in feed (proportion 25:75; starter, 0.5%; grower 1, 1%; grower 2, 1.5%; finisher, 2%).

BW, body weight, g; BWG, body weight gain, g; FI, feed intake, g; FCR, feed conversion ratio, kg/kg.