Gas production, pressure and carbon dioxide absorption in maize silage

Orientador: Prof. Dr. Patrick SchmidtTese (doutorado) - Universidade Federal do Paraná, Setor de Ciências Agrárias, Programa de Pós-Graduação em Zootecnia. Defesa : Curitiba, 28/03/2022Inclui referênciasResumo: Uma diversidade de microrganismos está associada à ensilagem. Existe uma enorme diversidade de interações entre enzimas vegetais e atividades microbianas. Estudos recentes detectaram surpreendentemente uma nova fase de pressão negativa dentro dos silos e o aumento do teor de matéria seca após a fermentação da silagem. Essas observações justificam a realização deste estudo e afirmam a possibilidade de vias de fixação de CO2 ocorrerem em silagens. Este ensaio teve como objetivo avaliar a produção de gás, a pressão no interior dos silos e absorção de carbono ao suplementar os silos com CO2.Abstract: A diversity of microorganisms is associated with ensilage. There is a huge diversity interaction among plant enzymes and microbial activities. Recent studies have surprisingly detected a new phase of negative pressure inside the silos and the increase in dry matter content after silage fermentation. These observations justify the conduction of this study and affirm the possibility of CO2-fixing pathways in silages. This trial aimed to evaluate the gas production, the pressure inside the silos and the carbon absorption when supplementing the silos with CO2

Gas production, pressure and carbon dioxide absorption in maize silage

Orientador: Prof. Dr. Patrick SchmidtTese (doutorado) - Universidade Federal do Paraná, Setor de Ciências Agrárias, Programa de Pós-Graduação em Zootecnia. Defesa : Curitiba, 28/03/2022Inclui referênciasResumo: Uma diversidade de microrganismos está associada à ensilagem. Existe uma enorme diversidade de interações entre enzimas vegetais e atividades microbianas. Estudos recentes detectaram surpreendentemente uma nova fase de pressão negativa dentro dos silos e o aumento do teor de matéria seca após a fermentação da silagem. Essas observações justificam a realização deste estudo e afirmam a possibilidade de vias de fixação de CO2 ocorrerem em silagens. Este ensaio teve como objetivo avaliar a produção de gás, a pressão no interior dos silos e absorção de carbono ao suplementar os silos com CO2.Abstract: A diversity of microorganisms is associated with ensilage. There is a huge diversity interaction among plant enzymes and microbial activities. Recent studies have surprisingly detected a new phase of negative pressure inside the silos and the increase in dry matter content after silage fermentation. These observations justify the conduction of this study and affirm the possibility of CO2-fixing pathways in silages. This trial aimed to evaluate the gas production, the pressure inside the silos and the carbon absorption when supplementing the silos with CO2

The Effects of Short-Time Delayed Sealing on Fermentation, Aerobic Stability and Chemical Composition on Maize Silages

Despite the efforts to improve the methodological standards of silage trials, many factors that can influence the results of lab-scale studies need to be better understood. This study aimed to determine the effects of short-time delayed sealing and inoculation with a blend of Lentilactobacillus buchneri and Lactiplantibacillus plantarum on fermentation, aerobic stability, and chemical composition of silages. Whole-crop maize was treated with or without a commercial inoculant and ensiled (29.3% dry matter) for 55 days in 8.8 L PVC silos that were sealed immediately (up to 30 min delay) or after a delay (90, 150, or 210 min between chopping and sealing) with five replicates each. The increasing air exposure before sealing increased fermentation losses and reduced silage nutritional value. Crude protein and ash were significantly affected by inoculation, with control treatments showing higher ash and lower protein values. Lignin, neutral detergent fiber, and acid detergent fiber were only affected by the delay period. The longer the sealing delay, the higher the gas production, and the lower the starch values and lactic acid content observed in samples. Inoculation was inefficient in reducing total dry matter losses, but it increased aerobic stability, acetic acid, and ethanol contents of silages and reduced effluent loss. Control silages had higher total dry matter loss during the aerobic exposure than inoculated silages. The results confirmed that the delay periods tested were long enough to negatively interfere with the chemical composition of silages, especially the fibrous fraction content