Associations between temperament and gene polymorphisms in the brain dopaminergic system and the adrenal gland of sheep

Sheep of calm or nervous temperament differ in their physiological (cortisol secretion) and behavioural (motor activity) responses to stressors, perhaps due to variation in genes that regulate glucocorticoid synthesis or brain dopamine activity. Using ewes that had been selected over 20 generations for nervous (n = 58) or calm (n = 59) temperament, we confirmed […]