Supplemental energy and protein increase use of sagebrush by sheep |
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| Institution: | 1. Graduate Student, Department of Animal Science, University of Wyoming, Laramie, WY 82071, USA;2. Supervisory Research Rangeland Management Specialist and Research Leader, USDA-Agricultural Research Service, Rangeland Resources and Systems Research Unit, Cheyenne, WY 82009, USA;3. Ecologists, USDA-Agricultural Research Service, Rangeland Resources and Systems Research Unit, Fort Collins, CO 82526, USA;4. USDA Northern Plains Climate Hub Fellow, Fort Collins, CO 80526, USA;5. The Great American Bison Diet Survey, Fort Yates, ND 58583, USA;6. T.M. O’Connor and Regents Professor, Department of Ecosystem Science and Management, Texas A&M University, College Station, TX 77843, USA;7. Rangeland Extension Specialist, Department of Ecosystem Science and Management, University of Wyoming, Laramie, WY 82071, USA;8. Department of Forest and Rangeland Stewardship, Colorado State University, Fort Collins, CO 80523-1472, USA;1. Cardiology Department, Hospital Universitari Germans Trias i Pujol, Badalona, Universitat Autònoma de Barcelona, Spain;2. Cardiology Department, Hospital Universitari de Bellvitge, L''Hospitalet de Llobregat, Barcelona, Spain;3. Internal Medicine Department, Hospital Universitari de Bellvitge, L''Hospitalet de Llobregat, Barcelona, Spain;4. Geriatric Medicine Department, Hospital General Universitario Gregorio Marañón, Madrid, Spain;5. Cardiology Department, Hospital General Universitario Gregorio Marañón, Madrid, Spain;6. Cardiology Department, Hospital Universitari Josep Trueta, Girona, Spain;7. Instituto Catalán de Ciencias Cardiovasculares, Hospital de Sant Pau, Barcelona, Spain;8. Cardiology Department, Hospital General Universitario Gregorio Marañón, Madrid, CIBERCV, Universidad Europea, Universidad Complutense, Madrid, Spain;1. Tytgat Institute for Liver and Intestinal Research, Academic Medical Center (AMC), University of Amsterdam, Postbus 22660, 1100 DD Amsterdam, The Netherlands;2. Surgical Laboratory, Academic Medical Center (AMC), University of Amsterdam, Postbus 22660, 1100 DD Amsterdam, The Netherlands;3. Bioinformatics Laboratory, Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Amsterdam Public Health Research Institute, Academic Medical Center (AMC), University of Amsterdam, Postbus 22660, 1100 DD Amsterdam, The Netherlands;4. Laboratory Genetic and Metabolic Diseases, Academic Medical Center (AMC), University of Amsterdam, Postbus 22660, 1100 DD Amsterdam, The Netherlands |
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| Abstract: | The ability of sheep to consume big sagebrush (Artemisia tridentata Nutt.), a shrub that contains terpenes, may be improved with supplemental energy and protein needed for detoxification processes. We compared feeding behavior of supplemented and unsupplemented ewes grazing separately in three 0.5 ha plots of 40 m × 120 m during October 2001. Supplemented ewes were offered a choice of a high-energy (50% corn and 50% beet pulp—3.62 Mcal/kg DE and 9.5% CP) and a high-protein (85% alfalfa and 15% soybean meal—2.89 Mcal/kg DE and 15% CP) supplement for 15 min/day. Supplemented ewes consumed 492 g (S.E. = 24.3) of the high-energy supplement and 140 g (S.E. = 9.8) of the high-protein supplement. The incidence of feeding on sagebrush was recorded using scan sampling at 10-min intervals from 09:00 to 17:00 h every other day for 10 days. Incidence of feeding on sagebrush increased gradually for both treatments from 0.4% on day 1 to 28% on day 10 (P < 0.01), but supplemented ewes increased feeding frequency on sagebrush to nearly twice that of unsupplemented ewes by the end of the trial. Averaged throughout the trial, incidence of eating sagebrush was twice as high for supplemented compared to unsupplemented ewes (22% versus 11% of the total time feeding, P < 0.01). The results of this study show that supplemental macronutrients increase use of sagebrush by ewes. Thus, strategic supplementation during fall and winter may be a way to increase intake of sagebrush by sheep and enhance and maintain biodiversity in areas of the sagebrush steppe where sagebrush is deemed too abundant. |
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