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The Impact of Selected Forage Legumes on Cattle Performance, Forage Production, and Soil Quality, and Evaluation of Legume Persistence Under Grazing

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The Impact of Selected Forage Legumes on Cattle Performance, Forage Production, and Soil Quality, and Evaluation of Legume Persistence Under Grazing University of Arkansas, Fayetteville ScholarWorks@UARK Theses and Dissertations 8-2012 The mpI act of Selected Forage Legumes on Cattle Performance, Forage Production, and Soil Quality, and Evaluation of Legume Persistence under Grazing Bradley Edward Briggs University of Arkansas, Fayetteville Follow this and additional works at: http://scholarworks.uark.edu/etd Part of the Agricultural Education Commons, Agronomy and Crop Sciences Commons, and the Meat Science Commons Recommended Citation Briggs, Bradley Edward, "The mpI act of Selected Forage Legumes on Cattle eP rformance, Forage Production, and Soil Quality, and Evaluation of Legume Persistence under Grazing" (2012). Theses and Dissertations. 529. http://scholarworks.uark.edu/etd/529 This Thesis is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Theses and Dissertations by an authorized administrator of ScholarWorks@UARK. For more information, please contact [email protected], [email protected]. The Impact of Selected Forage Legumes on Cattle Performance, Forage Production, and Soil Quality, and Evaluation of Legume Persistence under Grazing The Impact of Selected Forage Legumes on Cattle Performance, Forage Production, and Soil Quality, and Evaluation of Legume Persistence under Grazing A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Animal Science By Bradley E. Briggs University of Arkansas Bachelor of Science in Animal Science, 2009 August 2012 University of Arkansas Abstract Interest in substituting legumes for N fertilizer in beef cattle grazing systems has recently increased with rising fertilizer prices. Legumes are well known for their ability to fix atmospheric N and decrease dependence on input of N fertilizer. However, there are still difficulties associated with legume utilization including establishment and persistence. Two experiments were conducted to evaluate legume performance under herbivory. The objective of Experiment 1 was to compare forage production and beef cattle gains from annual ryegrass [Lolium multiflorum (L.)] and bermudagrass [Cynodon dactylon (L.) Pers.] pastures fertilized with N or overseeded with legumes. Gelbvieh × Angus crossbred heifers (n = 40; average of 264 ± 45.62 kg initial BW) were assigned to one of eight, 2-ha pastures in the spring of each of the three years of the study. All pastures were overseeded with ‘Marshall’ annual ryegrass, and were not seeded with any clover (Con) or overseeded with ‘Dixie’ crimson clover [(C; Trifolium incarnatum (L.)], ‘Osceola’ white clover [L; Trifolium repens (L.)], or a combination of crimson clover and white clover (CL). Grazing initiated early- to mid-spring and continued until early- to mid-May. Total body weight (BW) gain was greater (P < 0.05) in the spring season for Con compared to the legume treatments. However, average daily gain (ADG) was not different (P > 0.05) in spring, and there were no differences (P > 0.05) in total BW gain or ADG in summer. Although clovers may not be able to entirely eliminate the need for N fertilizer, they may help reduce dependency on it by aiding in the production of cattle having similar BW gains to cattle grazing traditionally fertilized pastures. The objective of Experiment 2 was to monitor the persistence of three annual and three perennial legume species overseeded into common bermudagrass pastures that were rotationally stocked. The three annual species were crimson clover (cv. Dixie), arrowleaf clover [Trifolium vesiculosum (Savi), cv. Yucchi], and hairy vetch [Vicia villosa (Roth), cv. VNS]. The three perennial species were white clover (cv. Durana), red clover [Trifolium pretense (L.), cv. Cinnamon Plus], and alfalfa [Medicago sativa (L.), cv. Ameristand 403T]. Annual clovers were managed to reseed themselves. Crimson clover persisted two years and all other annul species for three years. Among perennial legumes, only white and red clovers persisted for three years, while alfalfa stands disappeared after the second year of the study. The frequency of occurrence of weeds and other undesirable plants generally increased each year while legume populations declined in all six clover treatments. In order to maintain healthy and dense legume populations in grazing systems, it may be necessary to develop and adopt aggressive weed control strategies using chemical compounds including improved grazing management strategies. This thesis is approved for recommendation to the Graduate Council Thesis Director: _____________________________________________ Dr. Dirk Philipp Thesis Committee: _____________________________________________ Dr. Kenneth P. Coffey _____________________________________________ Dr. Mary Savin Thesis Duplication Release I hereby authorize the University of Arkansas Libraries to duplicate this thesis when needed for research and/or scholarship. Agree__________________________________________ Bradley E. Briggs Refused________________________________________ Acknowledgements I would like to thank Dr. Dirk Philipp for his wise counsel in all manner of things throughout the course of my graduate studies including academics. I would also like to thank Dr. Coffey and Dr. Savin for serving on my committee and augmenting my studies with their own expertise. I am extremely grateful for Don Hubbell, John Tucker, Rick Wilson, Todd Coles, Henry Headley, Tom Hess, and Joe Rolins in Batesville and Greg “G-money” Montgomery and all his staff in Monticello. They made this research possible and kept my trips to Batesville and Monticello fun and interesting. I also greatly appreciate the help of Karen Anschutz, Doug Galloway, and the other laboratory staff. Without their help I would probably still be doing laboratory work instead of writing this thesis. Table of Contents Page Abstract List of Figures List of Tables Introduction 1 Literature Review 3 Materials and Methods 24 Experiment 1: Monticello 24 Experiment 2: Batesville 28 Procedures Common to Experiment 1 and 2 30 Results and Discussion 35 Experiment 1 35 Animal Performance and Forage Mass Production 35 Species Composition 37 Forage Chemical Composition 39 Soil Quality 40 Experiment 2 41 Annual Legume Species Composition and Forage Mass Production 42 Annual Legume Chemical Composition 45 Perennial Legume Species Composition and Forage Mass Production 46 Perennial Legume Chemical Composition 49 Soil Quality Parameters for Annual Legumes 50 Soil Quality Parameters for Perennial Legumes 51 Summary of Experiment 1 and 2 51 Conclusion 54 References 56 List of Figures Figure 1. Experiment 1: Timeline of grazing, fertilization, and soil sampling. ...........................62 Figure 2. Experiment 2: Forage mass in the annual legume species study at the beginning of each grazing cycle during 2008. Data are presented for each month in which grazing began. Although a treatment by month interaction was observed (P < 0.05), data is shown for species differences within each month only. ..............................................................................................69 Figure 3. Experiment 2: Forage mass in the annual legume species study at the beginning of each grazing cycle during 2009. Data are presented for each month in which grazing began. Although a treatment by month interaction was observed (P < 0.05), data is shown for species differences within each month only. ..............................................................................................71 Figure 4. Experiment 2: Forage mass in the annual legume species study at the beginning of each grazing cycle during 2010. Data are presented for each month in which grazing began. Although a treatment by month interaction was observed (P < 0.05), data is shown for species differences within each month only. ..............................................................................................73 Figure 5. Experiment 2: Forage mass in the perennial legume species study at the beginning of each grazing cycle during 2008. Data are presented for each month in which grazing began. Although a treatment by month interaction was observed (P < 0.05), data is shown for species differences within each month only. ..............................................................................................77 Figure 6. Experiment 2: Forage mass in the perennial legume species study at the beginning of each grazing cycle during 2009. Data are presented for each month in which grazing began. Although a treatment by month interaction was observed (P < 0.05), data is shown for species differences within each month only. ..............................................................................................79 Figure 7. Experiment 2: Forage mass in the perennial legume species study at the beginning of each grazing cycle during 2010. Data are presented for each month in which grazing began. Although a treatment by month interaction was observed (P < 0.05), data is shown for species differences within each month only ...............................................................................................81 List of Tables Table 1. Experiment 1: Animal performance during spring and summer as affected by over- seeded legumes the previous fall. Pastures were grazed with different sets of cattle; thus, seasons were separately displayed ..............................................................................................................63 Table 2. Experiment 1: Pasture dry matter forage production and removal during
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