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Pain and Pessimism: Dairy Calves Exhibit Negative Judgement Bias following Hot-Iron Disbudding
- Heather W. Neave,
- Rolnei R. Daros,
- João H. C. Costa,
- Marina A. G. von Keyserlingk,
- Daniel M. Weary

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- Published: December 4, 2013
- https://doi.org/10.1371/journal.pone.0080556