Table 2.

Influence of energy (AMEn/kg) and standardized ileal digestible lys (DLys) contents of the diet on egg production from 19 to 59 wk of age.

	AMEn (kcal/kg)		DLys (%)					P-value2
	2,680	2,780	0.68	0.72	0.76	0.80	SEM (n = 9)1	Main effects3		Regression4
								AMEn	DLys	L	Q
DLys intake (mg/d)	819	811	744d	793c	843b	883a	7.24	0.157	<0.001	<0.001	0.417
Energy intake5	297b	305a	299	301	303	301	2.56	0.032	0.121	0.253	0.433
Egg rate (%)	85.9	86.3	84.8	86.4	86.7	86.5	1.63	0.747	0.620	0.252	0.390
Feed intake (g/d)	110.7	109.6	109.4	110.1	110.9	110.4	0.95	0.127	0.437	0.188	0.384
Egg weight (g)	60.2b	61.3a	60.1b	60.5b	61.0ab	61.4a	0.41	<0.001	0.013	0.003	0.816
Egg mass (g/d)	51.7	52.9	51.0	52.2	52.9	53.1	1.03	0.119	0.157	0.036	0.506
FCR6 (kg/kg)	2.148a	2.079b	2.148	2.113	2.106	2.086	0.0410	0.017	0.458	0.144	0.797
BW7 (g)	1,763	1,769	1,762	1,770	1,768	1,764	17.8	0.702	0.625	0.262	0.997
Mortality8	0.0581	0.0732	0.0455	0.0707	0.0707	0.0758		0.394	0.628	0.501	0.519
Energy efficiency9	5.68	5.70	5.79	5.69	5.66	5.61	0.11	0.735	0.441	0.124	0.802

^a-dValues with different superscript letters are significantly different (P < 0.05).

¹Standard error of the mean (36 and 18 replicates for the AMEn and DLys effects, respectively).

²Age effect was significant for all the variables studied (P < 0.001) except for bird mortality.

³The interactions were not significant for any of the variables studied (P > 0.10).

⁴The effects of the level of DLys on the different variable studied were partitioned into its linear (L) and quadratic (Q) components.

⁵Kcal AMEn/day.

⁶Feed conversion ratio.

⁷BW determined at 59 wk of age.

⁸Expressed as the proportion of dead birds with respect to total number of birds per cage.

⁹Kcal of AMEn/g of egg.