. 2021 Apr 21;100(7):101211. doi: 10.1016/j.psj.2021.101211

Table 3.

Influence of energy (AMEn/kg) and standardized ileal digestible lys (DLys) contents of the diet on egg quality traits 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
Egg quality
Haugh units	95.6	95.2	95.6	95.6	95.8	96.0	0.34	0.257	0.459	0.128	0.255
Shell strength (g/cm²)	4,542	4,572	4,519	4,571	4,585	4,553	0.0658	0.457	0.855	0.598	0.570
Unsaleable eggs⁵ (%)	2.23	1.92	2.16	2.31	1.96	1.88	0.259	0.357	0.506	0.190	0.478
Dirty (%)	0.97	0.88	0.98	0.95	0.86	0.91	0.137	0.230	0.773	0.489	0.862
Broken (%)	0.84	0.75	0.73	0.94	0.77	0.73	0.222	0.510	0.576	0.658	0.290
Shell-less (%)	0.42	0.30	0.45	0.42	0.32	0.25	0.106	0.364	0.466	0.038	0.746
Egg components⁶ (% of the egg)
Albumen	60.4	60.4	60.3	60.3	60.5	60.4	0.25	0.813	0.774	0.451	0.709
Yolk	26.3	26.4	26.3	26.4	26.3	26.3	0.19	0.524	0.987	0.984	0.948
Shell	13.3	13.2	13.4	13.4	13.2	13.3	0.18	0.281	0.593	0.274	0.508

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

Age effect was significant for all the variables studied (P < 0.001) except for the proportion of egg components.

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

⁴

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

⁵

∑ Dirty, broken, and shell-less eggs.

⁶

Determined in the last two experimental periods (52 to 59 wk of age), exclusively. Shell percentage was estimated as the difference between egg weight and albumen and yolk weights.