Table 6.

Effect of diet composition on energy balance, energy values, and energy utilization in laying hens.

Items	Reference diet	Test diets		SEM	P-value
		Corn 1	Corn 2
Energy balance, kcal/kg BW0.75/bird/D1
AMEI	189	167	177	4.71	0.17
HP	133	130	132	0.64	0.10
HI	45.3	42.0	44.1	0.64	0.10
RE2
Total	55.4	37.1	44.8	4.44	0.25
As protein	29.1a	15.8c	21.7b	1.55	<0.001
As fat	26.4	21.3	23.0	3.55	0.86
RQ3	1.006	1.004	1.006	0.002	0.93
Energy values, kcal/kg DM4
AME	3,104b	3,294a	3,389a	36.8	0.001
AMEn	2,993b	3,222a	3,294a	37.5	<0.001
NE	2,357b	2,466a	2,525a	25.8	0.02
Energy utilization, %
AME:GE	77.8	77.6	79.8	0.60	0.26
NE:AME	76.0	75.0	74.5	0.76	0.74
NE:AMEn	78.8	76.7	76.6	0.78	0.47

^a,bMeans within a row lacking a common superscript differ (P ＜ 0.05).

¹AMEI, apparent metabolizable energy intake; HP, heat production; HI, heat increment.

²RE, total retained energy; REegg, retained energy in egg; REbody, retained energy in body.

³RQ, respiratory quotient.

⁴GE, gross energy; AME, apparent metabolizable energy; AMEn, AME corrected for zero N retention; NE, net energy.