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. 2020 Mar 31;10(4):584. doi: 10.3390/ani10040584

Figure 4.

Figure 4

Effect of genotype 1 on rough eggshell eggs (a) and double-yolk eggs (b) according to the age of the hens. Different letters among lines at each age indicate different values. a, b, c, d: p < 0.05; A, B, C, D: p < 0.01. 1 Genotype: ER—Ermellinata di Rovigo; RM—Robusta maculata; HB—Hy Line Brown; HW—Hy Line White 36. Observations (n) per age (29–32 weeks, 33–36 weeks, 37–40 weeks, 41–44 weeks): ER (1450, 1371, 861, 1192); RM (790, 704, 1070, 892); HB (2083, 2271, 2350, 2188); HW (2138, 2565, 2004, 1833). χ2 p-value per age: rough eggshell eggs (<0.0001, 0.002, 0.0001, 0.22); double-yolk eggs (0.0008, 0.04, 0.009, 0.0008).