. 2022 Aug 1;101(10):102094. doi: 10.1016/j.psj.2022.102094

Table 3.

Physical features of the eggshell of goose eggs.

					Pores in the eggshell (pcs./0,25 cm²)
Factors	Reproduction season	Color (% whiteness)	Thickness (mm)	Density (g × cm⁻³)	Blunt part	Equatorial part	Sharp part	Estimated total number of pores
Parent flock age	First	78.1^a ± 3.4	0.526 ± 0.066	2.005^c ± 0.272	32.2^a ± 3.6	19.3^a ± 2.1	12.2 ± 2.0	10,985.2^b ± 423.1
	Second	76.5^b ± 3.5	0.517 ± 0.055	2.108^b ± 0.165	28.1^b ±2.7	16.5^b ± 2.0	11.5 ± 2.9	10,175.8^b±404.3
	Third	76.2^b ± 3.3	0.516 ± 0.051	2.109^b ± 0.152	28.1^b ± 3.5	15.9^b ± 2.5	12.1 ± 1.0	11,188.1^ab ± 450.0
	Fourth	77.0^ab ± 3.6	0.515 ± 0.051	2.226^a ± 0.421	28.4^b ± 4.4	16.0^b ± 1.2	12.0 ± 2.1	12,074.3^a ± 467.5
	P-value	0.001	0.505	0.000	0.010	<0.001	0.143	<0.001
Laying stage	Beginning	76.4^b ± 3.7	0.562^a ± 0.057	2.047^b ± 0.259	27.3^b ± 3.4	17.6^a ± 2.2	12.3^ab ± 2.0	11,093.0^c ± 379.6
	Peak	76.8^b ± 2.9	0.505^b ± 0.086	2.216^a ± 0.189	27.0^b ± 3.3	14.8^b ± 1.9	11.0^b ± 1.9	10,049.7^b ± 331.6
	End	77.8^a ± 3.7	0.489^c ± 0.045	2.068^b ± 0.213	33.6^a ± 2.9	18.7^a ± 2.1	13.2^a ± 2.3	12,175.5^a ± 539.3
	P-value	0.004	<0.001	<0.001	<0.001	<0.001	0.002	<0.001
Parent flock age × laying stage	P-value	<0.001	0.020	0.005	0.027	0.126	0.179	0.006

^a,b

Mean values marked with different letters differ statistically significantly, P-value <0.05; statistically significant interactions: age of the flock: laying period, P-value <0.05; ±SD, standard deviation; On each laying stage, 120 eggs were assessed (30 eggs from each age group). A total of 360 eggs were examined in the experiment.