Submitted to: Canadian Journal of Plant Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/22/2007
Publication Date: 1/1/2008
Citation: Jess, W., Svejcar, A.J., Angell, R.F. 2008. The Effect of Grazing Duration on Forage Quality and Production of Meadow Foxtail. Canadian Journal of Plant Science. 88:85-92
Interpretive Summary: Many livestock producers in the western US depend on hay production from flood meadows to feed their livestock during the winter. The meadows are increasingly being used for grazing as well. We evaluated whether grazing and haying could be combined during a growing season. Our results show that even two weeks of grazing during early growth can reduce hay yield substantially. this information should help livestock producers make forage management decisions for flood meadows.
Technical Abstract: For the last 50 years, meadow foxtail (Alipecurus pratensis L.) has been invading native flood meadows throughout the Harney Basin in southeastern Oregon. The expansion of the grass species has been the result of its broad climatic adaptation and ability to withstand drought while thriving in saturated soil conditions for a large part of the growing season. Growth of meadow foxtail starts as soon as adequate soil moisture exists. Managing this early maturing hay species can prove to be a challenge because soil saturation and elevated water tables make it difficult to harvest hay when forage quality and yield are maximized. The purpose of this study was to evaluate whether planned grazing would retard maturation and thus prolong forage quality. Treatments included a non-grazed control and grazin g durations of 2, 4, 6, and 8 weeks. Grazing was initiated in May of 1998 and 1999 on six replications of each treatment arranged in a randomized block design. Within each treatment/replication combination, ten 0.2 m2 plots were clipped to ground level at about two week intervals from May to August. The samples were weighed and dried for standing crop estimation and four of the 10 samples were selected at random and analyzed for acid detergent fiber (ADF), neutral detergent fiber (NDF), and crude protein (CP). We found that early spring grazing decreased forage yield significantly (p ' 0.05). Grazing tended to slow the seasonal decline in CP. The effects of grazing on the forage fiber components, however, were inconsistent. The relatively small increase in forage quality does not appear to compensate for the large decline in hay yield (a 40% decline in the shortest grazing duration treatment). We recommend that unfertilized meadow foxtail pastures be used for either haying or grazing but not both in a given growing season.