One-hundred-height piglets were subjected to Backtest (BT) at 10 and 17 days of age in two periods, at the environmental temperatures of 25°C and 22°C, and 30°C and 24°C, respectively. Before and after the BT, infrared thermo-images (IRT) of eye, back, womb and right side of each subject were taken. Rectal temperature, sex and live weight were also recorded. The data of body surface temperatures were processed using the Mixed procedure of SAS for repeated analysis. The model included the random effect of the subject, the fixed effects of period (1, 2), age at the BT (10 d, 17 d), BT (before and after), BT reactivity (LR, HR), sex (male, female), and the covariate live weight within age at the BT. The major sources of skin temperature variations were the period and the weight at the BT. There was a significant difference (P <0.05) in skin temperature before and after the BT at the positions of right ear and eye. It was found slightly lower after the BT due to a vasoconstriction caused by the stress of immobilization. The LR and HR piglets showed different surface body temperatures (P<0.05) only at the level of the right armpit. The results show the possibility to use the body surface temperature recorded by IRT in piglets stress assessment but highlight the need to take in account the environmental thermal conditions in order to control this primary source of variability.

DIFFERENCE OF SURFACE BODY TEMPERATURE IN PIGLETS DUE TO THE BACKTEST AND ENVIROMENTAL CONDITION

MAGNANI, DIEGO;CAFAZZO, SIMONA;NANNI COSTA, LEONARDO
2011

Abstract

One-hundred-height piglets were subjected to Backtest (BT) at 10 and 17 days of age in two periods, at the environmental temperatures of 25°C and 22°C, and 30°C and 24°C, respectively. Before and after the BT, infrared thermo-images (IRT) of eye, back, womb and right side of each subject were taken. Rectal temperature, sex and live weight were also recorded. The data of body surface temperatures were processed using the Mixed procedure of SAS for repeated analysis. The model included the random effect of the subject, the fixed effects of period (1, 2), age at the BT (10 d, 17 d), BT (before and after), BT reactivity (LR, HR), sex (male, female), and the covariate live weight within age at the BT. The major sources of skin temperature variations were the period and the weight at the BT. There was a significant difference (P <0.05) in skin temperature before and after the BT at the positions of right ear and eye. It was found slightly lower after the BT due to a vasoconstriction caused by the stress of immobilization. The LR and HR piglets showed different surface body temperatures (P<0.05) only at the level of the right armpit. The results show the possibility to use the body surface temperature recorded by IRT in piglets stress assessment but highlight the need to take in account the environmental thermal conditions in order to control this primary source of variability.
Proceedings of the XVth International Congress of teh International Society for Animal Hygiene
1029
1032
Magnani D.; Gatto M.; Cafazzo S.; Stelletta C; Morgante M.; Nanni Costa L.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/103154
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