Amongst the challenges in pig production under today's competitive market the issue of meeting the standards of animal welfare is enhanced. Animal vocalization can be a useful tool to identify the level of stress in piglets. This research aimed to evaluate the vocalization of piglets during a surgical procedure with and without anesthesia, and assess their level of stress by analyzing their vocal expressions. Two level of stress were assessed: moderate stress and acute stress. No difference was found the level of pain in both treatments.165168Cordeiro, A.F.S., Pereira, E.M., Nääs, I.A., Silva, W.T., Moura, D.J., Medida de vocalização de suínos (Sus scrofa) como um indicador de gasto energético. (abstract in English) (2009) Revista Brasileira de Engenharia de Biosistemas, 2, pp. 143-152Leidig, M.S., Hertrampf, B., Failing, K., Schumann, A., Reiner, G., Pain and discomfort in male piglets during surgical castration with and without local anesthesia as determined by vocalization and defense behaviour (2009) Applied Animal Behaviour Science, 116, pp. 174-178Manteuffel, G., Schon, P.C., Measuring pig welfare by automatic monitoring of stress calls (2004) Bornier Agratechnische Bericht, 29, pp. 110-118Marx, G., Horn, T., Thielebein, J., Knubel, B., Borell, E., Analysis of pain-related vocalization in young pigs (2003) Journal of Sound and Vibration, 266, pp. 687-698Schrader, L., Todt, D., Vocal quality is correlated with levels of stress hormones in domestic pigs (1998) Etology, 104, pp. 859-876Weary, D.M., Fraser, D., Vocal response of piglet to weaning: Effect of piglet age (1997) Applied Animal Behaviour Science, 54, pp. 153-16
