Fig. 4: Relationship between the additive allele effect and grey seal maternal performance at loci of two candidate genes [serotonin transporter (SERT) and dopamine receptor D4 (DRD4)].

SERT_12472 and DRD4_1363 genotypes showed trends with pup weaning mass (PWM) (A, B) and lactation duration (C, D). Sample size of females used for analyses are included above each genotype and number of behavioural observations are above the genotype mean. Error bars represent standard error of the genotype mean. The corresponding test statistics are provided in Table 3.