The effect of egg-laying rate on reproductive performance–related gene expression. Each mean represents 8 replicates, with 1 layer/replicate. (A) Hormone receptor genes; (B) reproductive performance–related gene; (C) apoptosis-related genes. Abbreviations: AMHR, Anti-Müllerian hormone receptor; AP, average egg-laying rate; Bcl2, B lymphoma cell 2; BMP, bone morphogenetic proteins; EF = 6 × 108 cfu/kg Enterococcus faecium; ESR1, estrogen receptor 1; ESR2, estrogen receptor 2; FSHR, follicle-stimulating hormone receptors; LHR, luteinizing hormone receptor; LP, low egg-laying rate; PCNA, proliferating cell nuclear antigen.