Disgrifiad
This thesis explored the sustainable utilization of grass within dairy production and green biorefining, addressing challenges related to enteric methane production in ruminants and the continuous availability and stability of grass-based biomass for green biorefineries. Article I investigated the potential of high-lipid concentrates to reduce the elevated enteric methane production associated with high-forage diets. Rapeseed cake and oats with high-lipid content were used instead of rapeseed meal and barley in the concentrates (24 vs. 65 g ether extract/kg dry matter) at two dietary forage levels (50% and 70% on a dry matter basis). To address the issue of continuous availability of grass as feedstock in the green biorefinery, Article II examined the effects of various preservation methods and use of a formic acid-based additive on liquid yield and composition. Preservation methods included ensiling, freezing-and-thawing, and drying-and-rehydrating. Additionally, different types of presses were used to evaluate whether the effects of pretreatments differed when different types of presses were used. Article III assessed the biorefinery efficiency and characteristics of liquid fraction produced from primary growth and regrowth of timothy grass as fresh and ensiled (for intact grass, pulp and moderately wilted grass), as well as the effects of silage additives. The additive treatments included an untreated control, formic acid-based additive, and lactic acid bacteria inoculant.| Cyfnod | 05 Medi 2025 |
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| Arholai | Nisola Ayanfe |
| Arholiad wedi ei chynnal yn |
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| Graddau amlygrwydd | Rhyngwladol |