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Pessimism and fearfulness in dairy calves.

Abstract：

:Animals that experience situations likely to induce negative emotions show changes in judgment associated with pessimism. Few studies have focused on whether animals express stable differences in pessimism and whether these differences are related to personality traits. The first aim of this study was to explore if dairy calves are consistent over time in making judgments under ambiguous situations. Our second aim was to determine whether individual differences in judgment bias are related to conventional personality traits assessed using four standardized tests (Open field, Novel object, Human reactivity and Social motivation test). We subjected animals to two sessions of judgment bias and personality trait tests at 25 and 50 d of age. Individual differences in judgment bias were consistent over time with some animals persistently making more pessimistic choices compared to others. Two main dimensions of personality (Fearfulness and Sociability), obtained through principal component analysis, were also highly consistent over time. Pessimism was related to fearfulness, with more fearful calves making more pessimistic judgments. We conclude that dairy calves differ in the way they perceive and react to ambiguity and that this relates to individual differences in fearfulness.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Lecorps B,Weary DM,von Keyserlingk MAG

doi

10.1038/s41598-017-17214-3

subject

Has Abstract

pub_date

2018-01-23 00:00:00

pages

1421

issue

1

issn

2045-2322

pii

10.1038/s41598-017-17214-3

journal_volume

8

pub_type

杂志文章

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