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Understanding Vocalization Might Help to Assess Stressful Conditions in Piglets
Agricultural Engineering College, State University of Campinas, Ave. Candido Rondon, 501, Campinas, SP, 13083-875, Brazil
Embrapa Agricultural Informatics, Ave. André Tosello, 209, Campinas, SP, 13083-886, Brazil
* Author to whom correspondence should be addressed.
Received: 2 August 2013; in revised form: 4 September 2013 / Accepted: 4 September 2013 / Published: 12 September 2013
Abstract: Assessing pigs’ welfare is one of the most challenging subjects in intensive pig farming. Animal vocalization analysis is a noninvasive procedure and may be used as a tool for assessing animal welfare status. The objective of this research was to identify stress conditions in piglets reared in farrowing pens through their vocalization. Vocal signals were collected from 40 animals under the following situations: normal (baseline), feeling cold, in pain, and feeling hunger. A unidirectional microphone positioned about 15 cm from the animals’ mouth was used for recording the acoustic signals. The microphone was connected to a digital recorder, where the signals were digitized at the 44,100 Hz frequency. The collected sounds were edited and analyzed. The J48 decision tree algorithm available at the Weka® data mining software was used for stress classification. It was possible to categorize diverse conditions from the piglets’ vocalization during the farrowing phase (pain, cold and hunger), with an accuracy rate of 81.12%. Results indicated that vocalization might be an effective welfare indicator, and it could be applied for assessing distress from pain, cold and hunger in farrowing piglets.
Keywords: animal welfare; pig farming; sound signals; classification algorithm
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da Silva Cordeiro, A.F.; de Alencar Nääs, I.; Oliveira, S.R.M.; Violaro, F.; de Almeida, A.C.M.; Neves, D.P. Understanding Vocalization Might Help to Assess Stressful Conditions in Piglets. Animals 2013, 3, 923-934.
da Silva Cordeiro AF, de Alencar Nääs I, Oliveira SRM, Violaro F, de Almeida ACM, Neves DP. Understanding Vocalization Might Help to Assess Stressful Conditions in Piglets. Animals. 2013; 3(3):923-934.
da Silva Cordeiro, Alexandra F.; de Alencar Nääs, Irenilza; Oliveira, Stanley R.M.; Violaro, Fabio; de Almeida, Andréia C.M.; Neves, Diego P. 2013. "Understanding Vocalization Might Help to Assess Stressful Conditions in Piglets." Animals 3, no. 3: 923-934.