Table 2.

Effect of phytase, age, and feeding length on growth performance and tibia ash percentage in broiler chickens

Age, D	Feeding length, day	Diet1	Final BW (g)	BW gain, g/bird	Feed intake, g/bird	G:F, g/kg	Tibia ash, %	Number of replicates
14	2 (days 12 to 14)	PC	442	103	133	770	47.7	8
14	2 (days 12 to 14)	NC	424	84	122	689	45.2	8
14	2 (days 12 to 14)	2,000	437	97	128	762	46.7	8
14	5 (days 9 to 14)	PC	456	233	285	816	46.2	8
14	5 (days 9 to 14)	NC	423	200	268	741	41.3	8
14	5 (days 9 to 14)	2,000	446	223	276	808	46.0	8
22	2 (days 20 to 22)	PC	993	143	217	659	50.9	8
22	2 (days 20 to 22)	NC	976	127	211	599	48.7	8
22	2 (days 20 to 22)	2,000	991	142	210	676	50.0	8
22	5 (days 17 to 22)	PC	1,013	376	529	711	50.9	8
22	5 (days 17 to 22)	NC	957	313	491	639	46.2	8
22	5 (days 17 to 22)	2,000	996	358	501	715	49.5	8
		PC	726	214	291	739	49	32
		NC	695	180	273	667	45	32
		2,000	718	205	279	740	48	32
14			438	157	202	764	46	48
22			988	243	360	666	49	48
	2		710	116	170	692	48	48
	5		715	284	392	738	47	48
	2	PC	718	123	175	714	49	16
	2	NC	700	105	167	644	47	16
	2	2,000	714	119	169	719	48	16
	5	PC	734	304	407	764	49	16
	5	NC	690	256	380	690	44	16
	5	2,000	721	291	389	761	48	16
14	2		434	95	128	740	47	24
14	5		442	219	276	789	44	24
22	2		986	137	213	644	50	24
22	5		989	349	507	688	49	24
P values
Diet			<0.01	<0.01	<0.01	<0.01	<0.01
Age			<0.01	<0.01	<0.01	<0.01	<0.01
Feeding length			0.29	<0.01	<0.01	<0.01	<0.01
Diet × Age			0.57	0.25	0.33	0.77	0.72
Diet × Feeding length			0.06	<0.01	0.05	0.96	0.02
Age × Feeding Length			0.56	<0.01	<0.01	0.83	0.22
Diet × Age × Feeding length			0.56	0.22	0.21	0.94	0.80
PC vs. NC			<0.01	<0.01	<0.01	<0.01	<0.01
NC vs. 2,000			<0.01	<0.01	0.14	<0.01	<0.01
Days 12 to 14 vs. 9 to 14			0.25	<0.01	<0.01	<0.01	<0.01
Days 20 to 22 vs. 17 to 22			0.73	<0.01	<0.01	<0.01	0.09
Days 12 to 14 vs. 20 to 22			<0.01	<0.01	<0.01	<0.01	<0.01
Days 9 to 14 vs. 17 to 22			<0.01	<0.01	<0.01	<0.01	<0.01

¹PC = positive control; NC = negative control; 2,000 = NC + 2,000 phytase units/kg; G:F = gain to feed ratio.