caa a22 4500 388060603 CHVBK 20180307125119.0 cr unu---uuuuu 161130e199804 xx s 000 0 eng 10.1017/S1357729800009425 doi S1357729800009425 pii (NATIONALLICENCE)cambridge-10.1017/S1357729800009425 Effect of duration of fasting period on short-term intake rates of lactating dairy cows [Elektronische Daten] The effects of duration of fasting on the short-term feeding behaviour of 12 grazing and 12 silage-fed lactating Holstein-Friesian dairy cows were examined. Four groups of three cows were rotated around fasting treatments of 1, 3, 6 or 13 h following a balanced Latin-square design. Herbage intakes for each treatment group were assessed over al-h period. As intended there were no significant differences in sward characteristics between the experimental plots grazed by cows from different treatment groups. However, total dry-matter (DM) intake, biting rate and DM intake per bite, measured over the 1-h grazing period, increased significantly when the duration offasting was extended from 1 to 6 or 13 h (P < 0·05). There were only minor differences in grazing behaviour following fasting durations ofl and 3, or 6 and 13 h. In a parallel study, undertaken to assess the influence offasting duration on appetite independently of grazing, four groups of three cows were housed indoors and offered 30 kg of a high quality grass silage. Silage DM intakes, measured over a 1-h period, increased significantly with extended fasting periods (P < 0·01), though silage DM intake was considerably lower than that of grazing cows for each fasting treatment. These results suggest that dairy cows grazing on good quality swards may be able to compensate for increased degree of hunger by increasing both biting rate and DM intake per bite to increase DM intake rate. Although the DM intakes of silage and grazed grass followed similar patterns of increasing intake with extended fasting duration, DM intake rates were considerably higher in grazing cows for each fasting treatment. Copyright © British Society of Animal Science 1998 dairy cows nationallicence fasting nationallicence food intake nationallicence grazing behaviour nationallicence herbage nationallicence Patterson D. M. Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR McGilloway D. A. Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR Cushnahan A. Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR Mayne C. S. Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR Laidlaw A. S. Applied Plant Science Division, Plant Testing Station, 50 Houston Road, Crossnacreevy, Castlereagh, Belfast BT6 9SH Animal Science Cambridge University Press 66/2(1998-04), 299-305 1357-7298 66:2<299 1998 66 ASC https://doi.org/10.1017/S1357729800009425 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1357729800009425 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Patterson D. M. Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR NATIONALLICENCE 700 1- McGilloway D. A. Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR NATIONALLICENCE 700 1- Cushnahan A. Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR NATIONALLICENCE 700 1- Mayne C. S. Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR NATIONALLICENCE 700 1- Laidlaw A. S. Applied Plant Science Division, Plant Testing Station, 50 Houston Road, Crossnacreevy, Castlereagh, Belfast BT6 9SH NATIONALLICENCE 773 0- Animal Science Cambridge University Press 66/2(1998-04), 299-305 1357-7298 66:2<299 1998 66 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge