Session: SUN 72-87-HPA Axis
Poster Board SUN-84
Behaviour was analysed in the following paradigms:-
- isolation in an enclosure (5 x 3m)(test 1)
- response to human intruder between subject and a conspecific (test 2)
- competition for food (test 3)
Indices of behavior were formulated to measure locomotion, vocalization, defecation, urination, contact with periphery of an enclosure and time to feed, depending upon the test. In test 1, LR showed increased tendency to escape the enclosure, bleated more often and had more locomotor activity than HR (Total Activity Score for LR was 6.5 ± 1.4 vs HR 2.9 ± 1.5, p<0.05). In test 2, LR animals spent more (P<0.05) time (109 ± 25sec) facing the human at a close distance than HR (63 ± 25sec). HR ignored the human intruder. This fearlessness in LR was also seen in test 3. Here, either HR or LR sheep competed with a control animal by exiting a gate and moving down a 13m long corridor to a food trough. LR were more likely to commence feeding prior to the controls (mean 8.8 ± 3.7sec before the controls) compared with HR which did not compete as strongly with the controls (mean time to feeding, 2.5 ± 4.4sec after controls)(P<0.05).
These differences in behaviour possibly relate to innate strategies, such that LR sheep have a more passive-aggressive coping style. This is generally consistent with previously reported behavior of LR mice2. The greater level of activity in LR may contribute to their reduced tendency to become obese on a high energy diet. The central pathways underlying these different patterns of behavior are yet to be defined.
Nothing to Disclose: KTKL, CL, IJC, BAH
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