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dc.contributor.authorThrift, Brian D.
dc.contributor.authorMosley, Jeffrey C.
dc.contributor.authorBrewer, Tracy K.
dc.contributor.authorRoeder, Brent L.
dc.contributor.authorOlson, Bret E.
dc.contributor.authorKott, Rodney W.
dc.date.accessioned2020-09-05T07:10:01Z
dc.date.available2020-09-05T07:10:01Z
dc.date.issued2008-01-01
dc.identifier.citationThrift, B. D., Mosley, J. C., Brewer, T. K., Roeder, B. L., Olson, B. E., & Kott, R. W. (2008). Prescribed sheep grazing to suppress spotted knapweed on foothill rangeland. Rangeland Ecology & Management, 61(1), 18-25.
dc.identifier.issn0022-409X
dc.identifier.doi10.2111/05-199R2.1
dc.identifier.urihttp://hdl.handle.net/10150/642921
dc.description.abstractSpotted knapweed (Centaurea biebersteinii DC.) is a perennial, invasive forb that infests millions of hectares of private and public rangelands in western North America. Previous research indicates that domestic sheep (Ovis aries) readily graze spotted knapweed, but landscape-scale prescriptive grazing of spotted knapweed has not been studied. We quantified the diets and forage utilization of a ewe-lamb band (about 800 ewes and 1 120 lambs) that prescriptively grazed spotted knapweed-infested foothill rangeland in western Montana in the summers of 2003 and 2004. In mid-June or mid-July, sheep grazed light and moderate infestations of spotted knapweed (13% and 36% of vegetative composition, respectively). Nutritive quality of sheep diets was similar to sheep grazing uninfested rangeland, and sheep exhibited few forage preferences or avoidances. Sheep diets averaged 64% spotted knapweed in the moderate infestation and 26% in the light infestation. Sheep in the light infestation ate fewer graminoids in June than July (17% vs. 55% of their diet, respectively; P=0.04), whereas sheep in the moderate infestation ate fewer graminoids in July (45% in June vs. 20% in July; P = 0.09). In the moderate infestation, relative utilization of spotted knapweed was greater in July than June (50% vs. 35%, respectively; P50.04), but averaged 46% in the light infestation. Previous research suggests that these levels of relative utilization may make herbicide application uneconomical. Relative utilization of graminoids was light in both infestations (15% in June or 31% in July). Our results indicate that sheep can prescriptively graze light or moderate spotted knapweed infestations in either June or July. Sheep consumption and relative utilization of graminoids will be less if light infestations are grazed in June rather than July. In moderate infestations, sheep will eat fewer graminoids and utilize spotted knapweed more heavily when grazed in July rather than June. 
dc.language.isoen
dc.publisherSociety for Range Management
dc.relation.urlhttps://rangelands.org/
dc.rightsCopyright © Society for Range Management.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectCentaurea
dc.subjectMontana
dc.subjectOvis aries
dc.subjectprescribed livestock grazing
dc.subjecttargeted livestock grazing
dc.subjectweeds
dc.titlePrescribed Sheep Grazing to Suppress Spotted Knapweed on Foothill Rangeland
dc.typetext
dc.typeArticle
dc.identifier.journalRangeland Ecology & Management
dc.description.collectioninformationThe Rangeland Ecology & Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform August 2020
dc.source.volume61
dc.source.issue1
dc.source.beginpage18-25
refterms.dateFOA2020-09-05T07:10:01Z


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