Is there any methods to reduce the abnormal behaviour of most bear in captivity instead of introduction of enrichment tools method?
Please check the following link and PDF attachments.
https://www.researchgate.net/publication/258495080_Environmental_Enrichment_as_a_Strategy_for_Mitigating_Stereotypies_in_Zoo_Animals_A_Literature_Review_and_Meta-analysis
Chapter Environmental Enrichment as a Strategy for Mitigating Stereo...
How are the bears being fed? If you are feeding them solely at one location in their enclosure at specific times every day, then there is no cause for them to forage and this can sometimes induce stereotypies. Try providing most of their food at their typical location (so that you can ensure that each individual is feeding adequately) and then scattering/hiding the remainder in the enclosure according to varying time-schedules. Yes, it means your zookeeper's schedule is disrupted somewhat, but at least it gives the bears something to do to fill their day. Don't forget too to consider their night-time behaviour. Do they have access outdoors at night - while they might be diurnal in the wild, bears will be active in the night-time under some scenarios.
Tagging onto what John said about feeding. Another issue to consider is feeding competition. If you are feeding at one location only, there may be a possibility for one or a few individuals to dominate food sources.
Re: abnormal behavior generally, without specific information on the cause, it is hard to suggest specific intervention strategies. It could be over-stress related to a group dynamics problem, it could be lack of environmental complexity, it could be as Huseyin suggests an issue of simple space or space ratios. Again pulling from John's response you may be seeing reductions in normal required activities (like foraging) which may relate to boredom. Some abnormal behavior may be produced to take up the extra time in which no other activities are available.
Finally, I'm not sure why you asked about non-env-enrichment methods. Perhaps you've instituted some and they are not successful? If that is the case, then they may not be the best methods for the specific abnormality. Just a thought.
You have to give a variety of enrichments. I agree with Smith and John O'Brien.
You have to keep the bear very activity during the day time.
No food after 6pm and you start you feeding from 7am at different intervals.
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