The effects of restricted access time to pasture (2, 4 or 6 h d-1; 2H, 4H or 6H) on ingestive behaviour and performance were assessed on four occasions per target grazing day (D1, initial day; D4, intermediate day; and D7, final day) in dairy ewes rotationally grazing berseem clover with a 7-day grazing period and a 21-day recovery period. A randomized block design with two replicates per treatment was used. All ewes were supplemented daily with 700 g per head of concentrates and 700 g per head of ryegrass-based hay. Pasture subplot and animal group data were analysed by a factorial model including access time (AT), grazing day (D) and their interaction as fixed factors. Sward height decreased from D1 (P < 0·001) and green leaf mass from D4 (P < 0·001) onwards during the grazing period. Grazing time as a proportion of AT was higher in 2H than in 4H and 6H ewes on D1 and D4 but not on D7 (P < 0·05 for AT × D). Herbage intake rate was higher in 2H than in 4H and 6H ewes (P < 0·001). Herbage and total intakes were higher in 4H and 6H than in 2H ewes (P < 0·001), with herbage intake varying non-linearly during the grazing period (P < 0·05). Milk yield was higher in 4H and 6H than in 2H ewes (P < 0·01). To conclude, despite the evidence of compensatory behaviour, restricting access time to 2 h d-1 constrained intake and performance of dairy ewes rotationally grazing berseem clover.

Grazing behaviour, intake and performance of dairy ewes with restricted access time to berseem clover (Trifolium alexandrinum L.) pasture / Molle, Giovanni; Decandia, M.; Giovanetti, Valeria; Manca, C.; Acciaro, M.; Epifani, Gian Paolo; Salis, L.; Cabiddu, A.; Sitzia, M.; Cannas, Antonello. - In: GRASS AND FORAGE SCIENCE. - ISSN 0142-5242. - 72:2(2017), pp. 194-210. [10.1111/gfs.12228]

Grazing behaviour, intake and performance of dairy ewes with restricted access time to berseem clover (Trifolium alexandrinum L.) pasture

MOLLE, GIOVANNI
;
GIOVANETTI, Valeria;EPIFANI, Gian Paolo;CANNAS, Antonello
2017

Abstract

The effects of restricted access time to pasture (2, 4 or 6 h d-1; 2H, 4H or 6H) on ingestive behaviour and performance were assessed on four occasions per target grazing day (D1, initial day; D4, intermediate day; and D7, final day) in dairy ewes rotationally grazing berseem clover with a 7-day grazing period and a 21-day recovery period. A randomized block design with two replicates per treatment was used. All ewes were supplemented daily with 700 g per head of concentrates and 700 g per head of ryegrass-based hay. Pasture subplot and animal group data were analysed by a factorial model including access time (AT), grazing day (D) and their interaction as fixed factors. Sward height decreased from D1 (P < 0·001) and green leaf mass from D4 (P < 0·001) onwards during the grazing period. Grazing time as a proportion of AT was higher in 2H than in 4H and 6H ewes on D1 and D4 but not on D7 (P < 0·05 for AT × D). Herbage intake rate was higher in 2H than in 4H and 6H ewes (P < 0·001). Herbage and total intakes were higher in 4H and 6H than in 2H ewes (P < 0·001), with herbage intake varying non-linearly during the grazing period (P < 0·05). Milk yield was higher in 4H and 6H than in 2H ewes (P < 0·01). To conclude, despite the evidence of compensatory behaviour, restricting access time to 2 h d-1 constrained intake and performance of dairy ewes rotationally grazing berseem clover.
Grazing behaviour, intake and performance of dairy ewes with restricted access time to berseem clover (Trifolium alexandrinum L.) pasture / Molle, Giovanni; Decandia, M.; Giovanetti, Valeria; Manca, C.; Acciaro, M.; Epifani, Gian Paolo; Salis, L.; Cabiddu, A.; Sitzia, M.; Cannas, Antonello. - In: GRASS AND FORAGE SCIENCE. - ISSN 0142-5242. - 72:2(2017), pp. 194-210. [10.1111/gfs.12228]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11388/177331
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