Duration of regrowth of ryegrass (Lolium perenne ) effects on grazing behaviour, intake, rumen fill, and fermentation of lactating dairy cows.

A - Papers appearing in refereed journals

Chilibroste, P., Tamminga, S., Boer, H., Gibb, M. J. and Dikken, G. den 2000. Duration of regrowth of ryegrass (Lolium perenne ) effects on grazing behaviour, intake, rumen fill, and fermentation of lactating dairy cows. Journal of Dairy Science. 83 (5), pp. 984-995.

AuthorsChilibroste, P., Tamminga, S., Boer, H., Gibb, M. J. and Dikken, G. den
Abstract

The relative importance of duration of sward regrowth and fill and fermentation in the rumen on the control of grazing time and intake rate during the first grazing session of the day was studied. Four lactating dairy cows were allowed to graze ryegrass (Lolium perenne) swards, with five different regrowth periods after mowing (6, 9, 16, 22, and 30 d). The cows were allowed to graze until they stopped voluntarily (cessation of grazing activity for at least 15 min). Before and after grazing the rumen contents were evacuated, weighed, sampled, and returned to the animals. Samples of rumen liquid were taken immediately before rumen evacuation and approximately 30, 60, 120, and 240 min after the grazing session was finished. Grazing time and intake rate did not follow a significant trend with period of regrowth. Bite rate did not change significantly with duration of regrowth with cows exhibiting high rates of biting for all the sward conditions. Rumen pools sizes of dry matter, neutral detergent fiber, and volatile fatty acids (VFA), measured after grazing, increased significantly with days of sward regrowth, even though the changes over days were small. Concentration of VFA followed a significant quadratic trend with a maximum concentration observed at approximately 110 min after cessation of grazing. In this study, rumen fill, VFA (either total or major components), ammonia, pH, and osmotic pressure as individual variables were not correlated with grazing time or dry matter intake.

KeywordsGrazing behavior; rumen fill; Fermentation
Year of Publication2000
JournalJournal of Dairy Science
Journal citation83 (5), pp. 984-995
Digital Object Identifier (DOI)doi:10.3168/jds.S0022-0302(00)74963-0
Open accessPublished as bronze (free) open access
Funder project or code1
Project: 2420 3102
Project: DS 1107
Publisher's version
Copyright license
Publisher copyright
Output statusPublished
Publication dates
Online01 May 2000
Publication process dates
Accepted18 Nov 2004
ISSN0022-0302
PublisherElsevier Science Inc

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