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Melches, Susanne; Mellema, Sibylle C; Doherr, Marcus G; Wechsler, Beat; Steiner, Adrian (2007). Castration of lambs: a welfare comparison of different castration techniques in lambs over 10 weeks of age. Veterinary journal, 173(3), pp. 554-63. Amsterdam: Elsevier 10.1016/j.tvjl.2006.01.006
Mellema, Sibylle C; Doherr, Marcus G; Wechsler, Beat; Thueer, Susann; Steiner, Adrian (2006). Influence of local anaesthesia on pain and distress induced by two bloodless castration methods in young lambs. Veterinary journal, 172(2), pp. 274-83. Amsterdam: Elsevier 10.1016/j.tvjl.2005.06.002
