Changes in the cortisol responses of lambs to tail docking, castration and ACTH injection during the first seven days after birth.
Mellor DJ, Murray L, Res Vet Sci, 1989 May - link

Effects of tail docking and castration on behaviour and plasma cortisol concentrations in young lambs.
Mellor DJ, Murray L, Res Vet Sci, 1989 May - link