Mountain mahogany and cottonseed meal as supplements for grass hay.

Author: 
Nunez-Hernandez, G.
Wallace, J.D.
Holechek, J.L.
Galyean, M.L.
King, D.W.
Kattnig, R.M.
Publisher: 
Rangeland Ecology & Management / Journal of Range Management Archives
Publication Year: 
1991
Description: 
Sixteen wether lambs (avg weight 34.5 kg) were used to study the influence of 2 sources of supplemental protein, leaves of mountain mahogany (Cercocarpus montanus Raf.) and cottonseed meal, on N digestibility and balance, forage digestibility, and voluntary intake by sheep fed a low-quality grass hay. Treatments were grass hay alone (C), C plus cottonseed meal, C plus mountain mahogany, and C plus mountain mahogany and cottonseed meal. All supplements provided 42 g of supplemental crude protein per head daily. Treatments were assigned to wethers within blocks according to a randomized complete block design. Supplemental N increased (P < 0.01) N digestibility and balance regardless of source; however, lambs supplemented with mountain mahogany digested less (P & 0.01) N, but their N balance did not differ (P > 0.10) from those supplemented with cottonseed meal. Wethers supplemented with mountain mahogany plus cottonseed meal ate more (P < 0.05) organic matter (OM) than the average consumed by those given either of the 2 supplements alone. Protein supplementation did not affect (P > 0.05) OM or fiber digestibility. Range management practices that encourage dormant season utilization of mountain mahogany by ruminants in the Southwest could reduce supplemental protein needs; such practices might include reserving mountain mahogany sites for winter use as well as greater use of mountain mahogany (and other palatable, highly nutritive shrubs) in range restoration programs in mountainous areas.
Document Type: 
Journal Issue/Article
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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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