The aim of this study was to identify, quantify, and describe pre-signs of aggression in pigs and the early stages of aggressive interactions. The experiment was carried out at a commercial farm on a group of 11 male pigs weighing on average 23 kg and kept in a pen of 4 m x 2.5 m. In total 8 hours were videorecorded during the first 3 days after mixing. As a result, 177 aggressive interactions were identified and labelled to find pre-sign body positions before aggressive interactions, attack positions and aggressive acts performed from these positions. A total of 12 positions were classified as pre-signs (P1–P12) and 7 of them were identified immediately at the start of aggressive interactions (P6–P12). Most common pre-sign positions were P3-pigs approaching and facing each other (24%) and P2-initiator pigs approaching from the lateral side (18%). In 80% of the cases the duration of pre-signs was 1–2 sec 72% of all aggressive interactions were short (1 to 10 sec). The most frequent attack positions were P12-inverse parallel (39.5%), P7-nose to nose, 90° (19.77%) and P9-nose to head (13.5%). The most frequent aggressive acts from attack positions were head knocking (34.4%), pressing (34.4%) and biting of different body parts (29.4%). Head knocking was mostly observed in relation to P7 and P2 positions and biting was common in the P7 position. In conclusion, pigs adopt specific pre-signs and body positions before the escalation of aggressive interactions. This could be used as potential sign to identify a beginning aggression.
How do pigs behave before starting an aggressive interaction? Identification of typical body positions in the early stage of aggression using video labelling techniques / G. Ismayilova, M. Oczak, A. Costa , L.T. Sonoda, S. Viazzi, M. Fels, E. Vranken, J. Hartung, C. Bahr, D. Berckmans, M. Guarino. - In: BERLINER UND MUNCHENER TIERARZTLICHE WOCHENSCHRIFT. - ISSN 0005-9366. - 126:3/4(2013), pp. 113-120.
|Titolo:||How do pigs behave before starting an aggressive interaction? Identification of typical body positions in the early stage of aggression using video labelling techniques|
|Parole Chiave:||Pig ; aggression ; body position ; labelling ; precision livestock farming|
|Settore Scientifico Disciplinare:||Settore AGR/10 - Costruzioni Rurali e Territorio Agroforestale|
|Data di pubblicazione:||2013|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.2376/0005-9366-126-113|
|Appare nelle tipologie:||01 - Articolo su periodico|