Developmental and family history‐based analysis of congenital fused labia phenotype in the captive common marmoset (Callithrix jacchus)

Background Congenital fused labia (CFL) is defined as a failure or significant delay in the opening of the juvenile sealed labia majora. This phenotype is known to be variably common in adult captive female marmosets but has never been investigated in detail before. Materials and Methods Here, we define, describe and quantify the variations in the degree of closure of the vulva in 122 captive marmosets (Callithrix jacchus) from 1.2 to 42 months old and include colony analysis. Results There was a negative correlation between the degree of labial fusion and animal age after prepubertal period (P