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Related Experiment Video

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Assessment of Mouse Judgment Bias through an Olfactory Digging Task

Assessment of Mouse Judgment Bias through an Olfactory Digging Task

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Oestrous phase cyclicity influences judgment biasing in rats.

Timothy Hugh Barker¹, Karen Lee Kind¹, Peta Danielle Groves¹

¹School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy Campus, Roseworthy, South Australia, Australia.

Behavioural Processes

|April 14, 2018

Summary

Female rats show more pessimistic responses during the dioestrous phase and when subordinate. Oestrous cyclicity influences judgment biases, a novel finding in animal welfare research.

Keywords:

Animal welfare Anxiety Cognitive bias Dioestrus Judgment bias test Oestrous phase

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Area of Science:

Animal behavior
Animal welfare science
Neuroscience

Background:

Cognitive bias is a key indicator of animal welfare.
Negative cognitive bias is linked to pessimistic information processing.
Current judgment-bias testing methods show discrepancies in cognitive expression between sexes.

Purpose of the Study:

To investigate if oestrous cycle phase or social status influences pessimistic responses in female rats.
To assess the impact of subordination stress and oestrous cycle rotation on cognitive bias.

Main Methods:

Utilized an active-choice judgment bias paradigm with 24 female Sprague-Dawley rats.
Assessed oestrous phase via vaginal cytology.
Categorized responses to ambiguous probes as optimistic or pessimistic.

Main Results:

Rats in the dioestrous phase exhibited a higher percentage of pessimistic responses.
Subordinate rats also showed an increased percentage of pessimistic responses.
No interaction was found between oestrous phase and social status.

Conclusions:

Oestrous cyclicity significantly influences judgment biases in female animals, a previously unreported finding.
Social status also impacts cognitive bias, with subordinate individuals showing more pessimism.
Future animal welfare studies should incorporate oestrous phase and social status as fixed effects.