Table 4. Effect of feed form and microbial enzymes supplementation on energy utilization of broiler chickens

Feed form	Enzyme	AME	MEI (KJ/d)	Energy utilization (KJ/d)		Energy retained (KJ/d) as		Efficiency of ME use for
Feed form	Enzyme	AME	MEI (KJ/d)	NE_p	HP	Protein	Fat	Energy	Protein	Lipid
Mash	No enzyme	11.8^b	747.5^b	424.1^ab	323.4	226.2^bc	240.7	0.50^c	0.27^d	0.28
	AXB	12.4^ab	777.7^ab	461.7^ab	316.0	242.0^abc	242.6	0.53^bc	0.28^cd	0.28
	QB	12.4^ab	812.1^ab	413.6^b	398.4	217.1^c	235.0	0.54^bc	0.28^bcd	0.31
	AXB + QB	12.6^ab	823.6^ab	479.1^ab	344.5	246.5^ab	271.5	0.60^ab	0.31^abc	0.34
Pellet	No enzyme	12.5^ab	847.7^ab	487.8^ab	359.9	257.5^a	255.1	0.61^ab	0.32^a	0.32
	AXB	12.9^a	857.8^ab	506.3^ab	351.5	259.4^a	269.8	0.63^a	0.32^a	0.34
	QB	13.1^a	824.9^ab	501.0^ab	323.8	247.3^ab	259.5	0.63^a	0.31^abc	0.33
	AXB + QB	13.4^a	876.0^a	504.0^a	372.0	259.9^a	267.3	0.62^ab	0.32^a	0.33
SEM		0.101	10.4	8.18	11.1	3.02	5.11	0.012	0.005	0.007
Significance
Feed form		0.001	0.002	0.001	0.783	0.001	0.138	0.001	0.001	0.065
Enzyme		0.005	0.285	0.191	0.795	0.010	0.397	0.391	0.523	0.429
Feed form × enzyme		0.947	0.399	0.455	0.245	0.419	0.698	0.446	0.348	0.348

Means with different superscripts within the columns are different (p < 0.05).
Values are means of 6 replicates (10 birds per replicate).
AXB, axtra XB (xylanase and beta-glucanase composite); QB, quantum blue (phytase); SEM, standard error of the mean; AME, apparent metabolizable energy; MEI, metabolizable energy intake; NE_p, net energy for production; HP, heat production.