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

Figure 3.

Figure 3

Effect of genotype 1 on dirty eggs (a), broken eggs (b) and eggs outside the nest (c) 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: dirty eggs (<0.0001 for all the ages); broken eggs (<0.0001 for all the ages); eggs outside the nest (at 29–32 weeks = 0.003, and then <0.0001).