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dc.contributor.authorMcCallum, Katie
dc.date.accessioned2020-12-18T18:25:56Z
dc.date.available2020-12-18T18:25:56Z
dc.identifier.urihttp://hdl.handle.net/10222/80139
dc.description.abstractFungal contamination of forages can cause decreased nutritive value, mycotoxin production and animal health issues. Ninety-three first-cut alfalfa-grass silage samples were collected from various storage types (wrapped round bales, conventional tower silos, horizontal bunker silos) on Canadian dairy farms. Quality analyses (near infrared reflectance [NIR], wet chemistry, digestibility analyses) and metagenomic sequencing were performed and effects of management factors on these parameters were evaluated. Pichia spp. yeasts capable of aerobic deterioration and mycotoxin-associated moulds of the genera Monascus and Pencillium were most abundant. Mycotoxin contamination was low with zearalenone (ZEA) present in 1% and mycophenolic acid (MPA) in 11% of samples. Higher yeast abundance in tower silos indicate they are not airtight and do not preserve quality well. Bales had lower heat damaged protein (ADF-CP) than other storage types despite a less complete fermentation. Findings will contribute to developing management plans to assist dairy producers in producing high quality silage.en_US
dc.language.isoenen_US
dc.subjectDairyen_US
dc.subjectMycotoxinsen_US
dc.subjectMetagenomicsen_US
dc.subjectFungien_US
dc.subjectSilageen_US
dc.titleManagement Practices and Quality of First-Cut Alfalfa-Grass Silage on Canadian Dairy Farmsen_US
dc.date.defence2020-12-03
dc.contributor.departmentFaculty of Agricultureen_US
dc.contributor.degreeMaster of Scienceen_US
dc.contributor.external-examinern/aen_US
dc.contributor.graduate-coordinatorGordon Priceen_US
dc.contributor.thesis-readerScott Whiteen_US
dc.contributor.thesis-readerJason Wellsen_US
dc.contributor.thesis-supervisorNancy McLeanen_US
dc.contributor.thesis-supervisorLinda Jewellen_US
dc.contributor.ethics-approvalNot Applicableen_US
dc.contributor.manuscriptsNot Applicableen_US
dc.contributor.copyright-releaseNot Applicableen_US
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