Cattle as dispersers of hound's-tongue on rangeland in southeastern British Columbia.

De Clerk-Floate, R.
Rangeland Ecology & Management / Journal of Range Management Archives
Publication Year: 
Hound's-tongue (Cynoglossum officinale L.) is a noxious weed on forested range of western North America (N.A.), which produces barbed nutlets (burrs) that attach to animals. There is anecdotal evidence that cattle are important dispersers of hound's-tongue in N.A., although European studies suggest animal dispersal of hound's-tongue burrs is minimal. The objectives of this research were to examine the role of cattle as hound's-tongue dispersers, and to develop a method of estimating hound's-tongue burr and plant density on rangeland that may be useful to researchers and range managers. To determine the movement of burrs onto cattle, the number of burrs on marked stalks, before and after grazing, were counted. In 1993 and 1994, about 65% of the burrs stalk-1 were picked up by grazing cattle, whereas, only 14% of the burrs stalk-1 were lost in a paddock ungrazed by cattle in 1994. Individual cows were monitored for burr gains and losses during monthly moves between paddocks by photographing their faces, and counting the burrs face-1 from projected slides. Cattle also were photographed every 2 weeks while in-situ on paddocks. Within 2 to 4 weeks, cows acquired and then lost burrs as they moved within and between paddocks. These experiments suggest that cattle are major dispersers of hound's-tongue on rangelands. There was a positive, linear relationship (R2=0.77; p
Document Type: 
Journal Issue/Article
Society for Range Management

Rangeland Ecology & Management (formerly the Journal of Range Management) serves as a forum for the presentation and discussion of facts, ideas, and philosophies pertaining to the study, management, ecology, and use of rangelands and their resources. The journal is peer-reviewed and provides international exchange of scholarly research and information among persons interested in rangelands. The Global Rangelands collection includes REM content up to 5 years from the current year. More recent content is available by subscription from BioOne and the Society for Range Management, and may be available at your local university library.
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