Leafy spurge
Leafy spurge
Photo Source: ARS Image Gallery

Sheep grazing larkspur
Sheep grazing larkspur
Photo Source: ARS Image Gallery

Wildfire
Wildfire
Photo Source: ARS Image Gallery

Grazing under powerlines
Grazing under powerlines
Image source: Public
Service of New Hampshire


 

    Nature's weed eaters

    Sheep and goats have long been used to control unwanted vegetation. Their use has increased in recent years because of the desire for biological control agents in environmentally sensitive areas. Grazing is also a more economical alternative in many situations. Sheep mostly graze forbs (flowering plants) and grass while goats prefer shrubs and other woody plant material.

    Noxious weeds
    Sheep are currently being used throughout the Great Plains and Intermountain regions to control noxious and invasive weeds. Many of these weeds could not be controlled by means of chemical, mechanical or cultural practices due to the high cost associated with these control methods or their relative ineffectiveness. One such weed is leafy spurge (Euphorbia esula), a Eurasian weed which has consumed millions of acres and is so competitive that it quickly crowds out all other plants to form a monoculture.

    Another weed, which has impacted many areas throughout the West, is Spotted Knapweed (Centaureamaculosa). This weed invades native ranges and threatens even pristine areas such as our national parks. Sheep readily graze knapweed and are being looked at as another tool to fight this aggressive invader.

    Sheep will readily consume kudzu (Pueraria montana), a vine that completely replaces all vegetation where it grows in the Southeast. Larkspur (Delphinium sp.) is a weed that is poisonous to cattle. Because sheep can tolerate up to 3 to 4 times more larkspur than cattle, they can be used to help control the weed in cattle pastures.

    Preventing wildfires
    Sheep are being used in many places to reduce the threat of wildfire in areas where wildlands interface with urban communities. This method of reducing wildfire is called creating a “fuelbreak.” The goal is to reduce the amount of fuel, reduce vegetation height, and create an effective firebreak.

    Improving plant biodiversity
    Numerous studies have shown how sheep and goats, used under prescribed conditions, can help increase the plant biodiversity on western ranges. Since sheep prefer to graze and bed on upland areas away from wet lowlands, they are easier to manage in grazing areas where critical riparian and watershed issues are a concern.

    When sheep are grazed in the same areas for several years, the level of perennial grasses within the plant community tends to increase which has been shown to increase water infiltration and decrease erosion.

    Improving wildlife habitat
    Prescribed sheep grazing has been shown to enhance wildlife habitat in a variety of ways. By allowing sheep to graze different areas at specific times of the year, the quality and quantity of certain critical vegetation types can be enhanced.

    Tree plantations
    Sheep producers in Canada are now being paid up to $35 per sheep to graze newly planted tree plantations. This method of prescribed grazing increases the viability of the new tree seedlings by reducing the competition of grasses, forbs and weedy species for water, soil nutrients and sunlight. "Trained" sheep have been used to graze in vineyards.

    Grazing under powerlines
    Power companies are “hiring” sheep (and goat) herds to keep areas under power lines in forested areas grazed, thus reducing the chance that an errant spark from the lines might start a wildfire and destroy the power line and surrounding forest.

    Sheep and solar power
    Many of the growing number of solar farms utilize sheep for vegetation control. Combining the two activities provides both an economic and environmental benefit. Most of the vegetation under the solar panels is available for grazing. Without the sheep, the site would need to be mowed frequently and managed in some other manner. To allow grazing, the panels simply need to be positioned high enough off the ground to allow grazing.

    Hefted sheep
    The extensive grazing of hefted sheep on the commonland of Britain is a unique phenomenon in Europe, enabling livestock to be kept in unfenced areas without constant shepherding. Each hefted flock has its own territory and is self-confining to that area, a heft. Extended areas are divided into numerous hefts, with each flock knowing its own area and returning to it after lambing, veterinary treatment or other husbandry requirements.

    Hefted sheep are integral to maintaining the unique and "wild" or semi-natural environment of which they form part. Unfortunately, the numbers of hefted sheep were reduced drastically by the British government during the 2001 foot-and-mouth disease outbreak


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Last updated 21-Sep-2015
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