Table 5.

Growth performance, at different ages, of the broiler chickens receiving phytase and xylanase individually or in combination¹.

Phytase, FTU/kg	Xylanase, BXU/kg	Body weight (g)			0–7 D			0–28 D
		Day 0	Day 7	Day 28	BWG (g/bird)	FI (g/bird)	FCR (g/g)	BWG (g/bird)	FI (g/bird)	FCR (g/g)
Main effects for phytase
500		40.46	124.7	1,068	84.3	141.5	1.684	1,028	2,416a	2.368a
1,500		40.64	124.4	1,098	83.8	145.6	1.742	1,058	2,291a,b	2.173b
3,000		40.49	124.1	1,097	83.6	144.5	1.738	1,057	2,153b	2.070b
Least significant difference		0.3	4.6	73	4.65	5.1	0.081	73	141	0.183
Main effect for xylanase
	0	40.55	123.2	1,066	82.7	142.3	1.726	1,025	2,331	2.294a
	16,000	40.51	125.6	1,110	85.1	145.4	1.716	1,070	2,242	2.113b
Least significant difference		0.24	3.8	60	3.8	4.2	0.066	60	115	0.15
Interaction effects
500	0	40.6	125.4	1,048	84.9	142.0	1.676	1,007	2,504	2.498
500	16,000	40.3	124.0	1,088	83.7	141.0	1.691	1,048	2,329	2.237
1,500	0	40.7	122.5	1,108	81.9	141.5	1.731	1,068	2,327	2.189
1,500	16,000	40.6	126.3	1,088	85.7	149.8	1.754	1,048	2,255	2.157
3,000	0	40.3	121.6	1,040	81.3	143.5	1.772	1,000	2,163	2.195
3,000	16,000	40.6	126.5	1,153	85.9	145.4	1.703	1,113	2,142	1.945
Least significant difference		0.42	6.5	103	6.58	7.2	0.114	103	199	0.259
P-values for main effects and interaction
Phytase		0.401	0.960	0.642	0.952	0.252	0.275	0.644	0.002	0.007
Xylanase		0.783	0.206	0.141	0.201	0.148	0.760	0.140	0.125	0.019
Phytase × Xylanase		0.134	0.341	0.197	0.406	0.180	0.451	0.199	0.541	0.373

^a-cValues in the same column with different letters are significantly different (P < 0.05).

Abbreviations: BWG, body weight gain; FCR, feed conversion ratio.

¹Data are means of 8 pens with 20 birds in the first period (day 0–7) and with 10 birds per pen in the second period (day 0–28).