Separation from the Dam Causes Negative Judgement Bias in Dairy Calves Daros, Rolnei R. ; Costa, João H. C. ; von Keyserlingk, Marina A. G. ; Hötzel, Maria J. ; Weary, Daniel M. Abstract Publication: PLoS ONE Pub Date: May 2014 DOI: 10.1371/journal.pone.0098429 Bibcode: 2014PLoSO...998429D