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Social housing improves dairy calves’ performance in a competition test
Borealis
Suchon, Malina; Ede, Thomas; Vandresen, Bianca; von Keyserlingk, M.A.G — 2023-04-21 This study aimed to investigate the impact of early-life social housing on dairy calves' competitive skills. Calves were housed either individually (n=9) or in pairs (n=9). After 14 d of housing treatment, calves underwent a competition test for 5 d against a competitor. Pair housed calves performed better than individually housed calves: throughout the competition days, individually housed calves increased their latency to approach the milk bottle and decreased their time spent drinking in contrast to pair housed calves which exhibited stable latencies to reach the milk bottle and increased their time drinking. To control for the influence of personality on their competitive abilities, all calves were subjected to personality tests assessing boldness before being exposed to the housing treatment. Bolder calves tended to approach the milk bottle faster. Our results provide additional evidence of the beneficial effects of social housing on dairy calves’ behavioral development.
UBC Dataverse Translation missing: fr.blacklight.search.logo
The effect of access to a well-resourced environment on dairy calves' cognition and affective states
Borealis
Suchon, Malina; Weary, D.M; von Keyserlingk, M.A.G — 2024-11-08 This study aimed to explore the effect of environmental complexity on the ability of dairy calves to discriminate between conspecifics and on their sensitivity to reward. Calves were housed either in 1) pair housing for 22.5 h/d with 1.5 h of daily access to a well-resourced pen which included 3 other calves and physical devices (enriched calves, n=6 pairs) or 2) pair housing for 24 h/d (control calves, n=6 pairs). After 10 d of housing treatment, calves were trained to discriminate between 2 calves in a Y-maze over 20 d. Twelve of the 24 calves tested met the learning criterion and treatment did not affect the number of sessions needed to reach the learning criterion. Calves were then subjected to a Successive Negative Contrast test during which they were trained to approach a milk reward over 3 trials/day for 3 days. On the last training day, latencies of enriched calves increased over daily trials while control calves were faster and remained relatively consistent, suggesting a greater sensitivity to reward. Starting on day 4, the reward was reduced for the 5 following test days. On test days, calves’ latencies to reach the reward increased across daily trials but no effect of treatment or days was found. Our findings suggest that calves can discriminate among individuals but learning performance did not differ between treatments. Calves raised in standard pair housing showed increased sensitivity to reward, supporting they may experience a more negative emotional state in comparison to calves reared with temporary access to a well-resourced environment

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(auteur : Suchon, Malina)

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