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1 January 2013 Recovery and Viability of Sulfur Cinquefoil Seeds From the Feces of Sheep and Goats
Rachel A. Frost, Jeffrey C. Mosley, Brent L. Roeder
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Targeted grazing by sheep or goats is a potentially useful tool for suppressing the noxious weed sulfur cinquefoil (Potentilla recta L.). However, possible transmission of weed seeds by grazing livestock is a serious ecological concern that must be addressed in any targeted grazing prescription. We investigated the effect of sheep and goat digestion on the viability of sulfur cinquefoil seeds collected from live plants growing on a foothill rangeland site in southwestern Montana. Eight sheep and eight goats (all wethers) were each gavaged with 5 000 sulfur cinquefoil seeds. Four animals of each species received immature seeds, and four animals received mature seeds. All animals were fed ground grass hay in excess daily, and intake averaged 2.0% body weight · d−1. Total fecal collection began immediately after gavaging and continued for 7 consecutive days. Once each day, all identifiable sulfur cinquefoil seeds were recovered and counted from fecal subsamples. Seed viability before gavaging averaged 36% for immature seeds and 76% for mature seeds. Sheep and goats excreted similar numbers of viable seeds. Almost all (98%) of the viable seeds recovered from sheep and goats were excreted during Day 1 and Day 2 after gavaging. No viable seeds were recovered from either sheep or goats after Day 3. Our estimates of sulfur cinquefoil seed excretion and viability in sheep and goat feces are likely inflated compared with targeted grazing animals because gavaging with seeds bypassed mastication. Grazing livestock that consume sulfur cinquefoil seeds should be kept in a corral for at least 3 d to prevent transferring viable seeds to uninfested areas.

Rachel A. Frost, Jeffrey C. Mosley, and Brent L. Roeder "Recovery and Viability of Sulfur Cinquefoil Seeds From the Feces of Sheep and Goats," Rangeland Ecology and Management 66(1), 51-55, (1 January 2013).
Received: 8 December 2011; Accepted: 1 August 2012; Published: 1 January 2013
endozoochory, Potentilla recta
prescribed grazing
targeted grazing
weed seeds
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