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Decandia, M.; Molle, G.; Cabiddu, A.; Giovanetti, V.

The effect of PEG on energy expenditure (EE), heart rate (HR) oxygen consumption (VO2), feeding behaviour and performance of eight Sarda goats, browsing on lentisk-based bushland, was studied. Two treatments were compared in a switch-over design: Control (C) and PEG (50 g/goat/day). HR was continuously recorded; VO2 was measured by an open circuit system. EE was estimated from daily HR measurements and oxygen consumption calibrated against oxygen consumption per heart beat (O2 pulse, ml O2/kg MW/beat). Feeding behaviour and intake were quantified by direct observation of biting. In vivo DM and CP digestibility were measured by alkanes. EE and HR were higher in PEG goats (P<0.01). The treatment had no effect on O2 pulse. PEG goats tended to ingest more at pasture than controls (P<0.09). DM digestibility was similar whereas CP digestibility was higher in PEG goats (P<0.05). The estimated ME intake tended to be higher in PEG group (P<0.2).

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Energy expenditure of dairy goats supplemented with PEG and browsing on Mediterranean brushland
67A

Decandia, M.; Molle, G.; Cabiddu, A.; Giovanetti, V.

Energy expenditure of dairy goats supplemented with PEG and browsing on Mediterranean brushland

The effect of PEG on energy expenditure (EE), heart rate (HR) oxygen consumption (VO2), feeding behaviour and performance of eight Sarda goats, browsing on lentisk-based bushland, was studied. Two treatments were compared in a switch-over design: Control (C) and PEG (50 g/goat/day). HR was continuously recorded; VO2 was measured by an open circuit system. EE was estimated from daily HR measurements and oxygen consumption calibrated against oxygen consumption per heart beat (O2 pulse, ml O2/kg MW/beat). Feeding behaviour and intake were quantified by direct observation of biting. In vivo DM and CP digestibility were measured by alkanes. EE and HR were higher in PEG goats (P<0.01). The treatment had no effect on O2 pulse. PEG goats tended to ingest more at pasture than controls (P<0.09). DM digestibility was similar whereas CP digestibility was higher in PEG goats (P<0.05). The estimated ME intake tended to be higher in PEG group (P<0.2).

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