Rejuvenation of depleted pasture using bloat-free legumes for high performance cattle grazing

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dc.contributor.authorKhatiwada, Bikash
dc.contributor.supervisorThomas, James E.
dc.contributor.supervisorAcharya, Surya
dc.date.accessioned2018-01-24T15:49:04Z
dc.date.available2018-01-24T15:49:04Z
dc.date.issued2018
dc.degree.levelMastersen_US
dc.description.abstractDirect seeding into existing pasture is expected to reduce time for rejuvenation and loss of productivity. To accomplish this, experiments were conducted to determine appropriate method of pasture rejuvenation using bloat-free forage legumes. Four sainfoin (Onobrychis viciifolia Scop.) and three cicer milkvetch (CMV) (Astragalus cicer L.) populations were seeded into alfalfa and grass pastures using three seeding methods to compare their ability to establish and persist in the mixtures. At Lethbridge where the old pasture was predominantly alfalfa, significantly higher (p<0.001) proportion of newly established plants were observed when the pasture was completely plowed and reseeded with both alfalfa and test populations (cultivation method) than directly seeding sainfoin or CMV for rejuvenation. Between the two test populations sainfoin contributed higher (p<0.05) proportions of plants to the pasture mix compared to the CMV populations. Two of the three new sainfoin populations, AAC Mountainview and LRC3432 seeded in alternate rows with alfalfa contributed >20% (p< 0.05) in total dry matter (DM) yield at each harvest. In grass pastures at Ponoka and Red Deer maximum biomass contribution from test populations when drilled were 2.3% and 8.2% respectively. Grass-legume mixtures with >10% legume stands increased soil available nitrogen in 2 years. Although in two years sainfoin and CMV mixed pastures did not sequester organic carbon in soil, they increased microbial carbon biomass and enzyme associated with C-cycling. Seeding of two sainfoin populations AAC Mountainview and LRC3432 into established alfalfa pasture could improve productivity of existing pasture while preventing bloat in grazing cattle.en_US
dc.embargoNoen_US
dc.identifier.urihttps://hdl.handle.net/10133/5021
dc.language.isoen_USen_US
dc.proquest.subject0285en_US
dc.proquest.subject0777en_US
dc.proquest.subject0481en_US
dc.proquestyesYesen_US
dc.publisherLethbridge, Alta. : University of Lethbridge, Dept. of Biological Sciencesen_US
dc.publisher.departmentDepartment of Biological Scienceen_US
dc.publisher.facultyArts and Scienceen_US
dc.relation.ispartofseriesThesis (University of Lethbridge. Faculty of Arts and Science)en_US
dc.subjectAlfalfaen_US
dc.subjectBloat in animalsen_US
dc.subjectFallowingen_US
dc.subjectLegumes as feeden_US
dc.subjectSowingen_US
dc.subjectTillageen_US
dc.titleRejuvenation of depleted pasture using bloat-free legumes for high performance cattle grazingen_US
dc.typeThesisen_US
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