4th International Seminar on Behavioral Methods
Abstract
Early life environment, including family separation, can have a major influence on cognition and behaviour, increasing the risk of anxiety or depression-like symptoms.We compared the performance of family reared and supplementary-fed common marmosets (Callithrix jacchus) in a battery of measures, including a novel cognitive bias task for use in non-human primates.No significant differences between rearing conditions were found in responses to human or novel object tests, suggesting no effect on neophobia.There were no differences in cognitive bias task acquisition time, and only minor differences in response to the probes, with supplementary-fed marmosets demonstrating a mildly reduced expectation of reward.Similarly, in a 2 bottle preference test for anhedonia, no difference was found between rearing conditions in consumption of appetitive milkshake, although supplementary-fed triplets showed a very small reduction of interest in reward at the lowest concentration.This consistent pattern of results suggests that the supplementary feeding at this facility did not have a major effect on learning and affective state in adulthood.Therefore, while family separation is not recommended, this particular practice should be used if it is necessary, to promote the welfare of the animals. L2.
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