Backtest (BT) and Tonic Immobility Test (TIT) allow to classify piglets in different type of coping style (HR=High-Resisting; LR=Low-Resisting for the BT; non-TI= don’t show tonic immobility and TI=showing tonic immobility for the TIT) on the basis of their reaction to restrain. There are no data concerning the relationship between TIT and BT responses in piglets. The aim of this study was to investigate this potential relationship. Sixty piglets of commercial crossbred (Duroc x (Landrace x Large White)) reared in the same farm were examined. The BT was performed on all piglets at 10 and 17 days of age; the TIT was carried out at 9 days (20 piglets), at 13 days (20 piglets) and at 19 days (20 piglets) of age. Results of the tests were not influenced by their reciprocal temporal sequence. There was not a correspondence between the BT and TIT categories. This result suggests that the two tests measure reactions to different challenging stimuli and they may be used as indicators of different types of response to restrain. In the BT, the duration of vocalization, struggling, and relaxation were significantly different (P<0.05) between HR and LR piglets.
BACK TEST vs TONIC IMMOBILITY TEST: BEHAVIOURAL RESPONSE IN TWO DIFFERENT RESTRAIN SITUATIONS
MAGNANI, DIEGO;CAFAZZO, SIMONA;DALL'OLIO, STEFANIA;NANNI COSTA, LEONARDO
2011
Abstract
Backtest (BT) and Tonic Immobility Test (TIT) allow to classify piglets in different type of coping style (HR=High-Resisting; LR=Low-Resisting for the BT; non-TI= don’t show tonic immobility and TI=showing tonic immobility for the TIT) on the basis of their reaction to restrain. There are no data concerning the relationship between TIT and BT responses in piglets. The aim of this study was to investigate this potential relationship. Sixty piglets of commercial crossbred (Duroc x (Landrace x Large White)) reared in the same farm were examined. The BT was performed on all piglets at 10 and 17 days of age; the TIT was carried out at 9 days (20 piglets), at 13 days (20 piglets) and at 19 days (20 piglets) of age. Results of the tests were not influenced by their reciprocal temporal sequence. There was not a correspondence between the BT and TIT categories. This result suggests that the two tests measure reactions to different challenging stimuli and they may be used as indicators of different types of response to restrain. In the BT, the duration of vocalization, struggling, and relaxation were significantly different (P<0.05) between HR and LR piglets.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
