Energy expenditure of dairy goats supplemented with PEG browsing on Mediterranean bushland | Dépense d'énergie par des chèvres laitières au pâturage dans les zones arbustives mediterranéennes
2005
Decandia, M.(Istituto Zootécnico e Caseario per la Sardegna, Olmedo, (Italy)) | Molle, G. | Cabiddu, A. | Giovanetti, V. | Brosh, A.
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 (P0.01). The treatment had no effect on O2 pulse. PEG goats tended to ingest more at pasture than controls (P0.09). DM digestibility was similar whereas CP digestibility was higher in PEG goats (P0.05). The estimated ME intake tended to be higher in PEG group (P0.2).
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