Effects of early social experience on sexual behavior in Japanese quail (Coturnix Japonica)

Experiences during immature phases of development, especially social experiences with individuals of the opposite sex, have implications for adult sexual behavior. Nevertheless, whether and how early experience can affect sexual learning in adulthood is still unclear. We present two experiments exploring how early experience impacts adult sexual Pavlovian conditioning in male Japanese quail. In Experiment 1, 25 male Japanese quail divided into three groups received different stimuli presentations at an early age, namely paired presentations of a conditioned stimulus (CS; a terry cloth model) and an unconditioned stimulus (US; an adult female quail), unpaired presentations of CS and US, and no exposure to stimuli. When they reached sexual maturity, we performed a sexual Pavlovian conditioning procedure with all groups using the same stimuli and tested their conditional response. In Experiment 2, we replicated the first experiment but with younger subjects and additional control variables. In the first experiment, we observed shorter approaching latencies to the CS and longer times near the CS in subjects with paired CS-US presentations compared to unpaired stimuli presentations. This was not replicated in Experiment 2. In both experiments, we found shorter approaching latencies and longer times near the CS in the groups with early exposure to the stimuli (paired or unpaired) compared to the group without this experience. Our findings indicate that the early presentations of stimuli at early stages of life can influence males' (speed of) sexual Pavlovian conditioning during adulthood.