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Stickstoffnutzungseffizienz roher und anaerob vergorener Güllen: Eine Studie mit unterschiedlichen 15N Methoden Organic Eprints
Hutter, M.; Krebs, R.; Mayer, Jochen.
In agricultural biogas plants in Switzerland, in general 80 % or more of the digested organic matter is farmyard manure. Organic waste materials are used as cosubstrates. A field experiment with silage maize was conducted to test whether the apparent nitrogen use efficiency (NUE) of anaerobically digested slurries is higher than the one of raw slurries in the year of application. Two different 15N labelling methods were used. In the 15N direct method, slurry NH4-N was labelled. In the indirect 15N isotope dilution method soil was pre-labelled by incorporating 15N labelled clover-grass powder; maize received unlabelled slurry. In the 15N direct approach, raw slurries had the lowest apparent NUE of NH4-N, two anaerobically digested (AD) slurries had an...
Tipo: Conference paper, poster, etc. Palavras-chave: Soil quality; Nutrient turnover; Farm nutrient management.
Ano: 2017 URL: http://orgprints.org/31863/1/Stickstoffnutzungseffizienz%20roher%20und%20anaerob%20vergorener.pdf
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Unterscheiden sich die Schädelformen von behornten und unbehornten Kühen? Organic Eprints
Probst, Johanna K.; Kauf, P.; Ackermann, Anja; Hutter, M.; Spengler Neff, Anet.
173 skulls of Swiss Brown dairy cows (horned=65, disbudded=165) were osteometrically sized. The greatest post-orbital width and the longitudinal height of the foreheads were recorded. The shape of the frontal bone was scaled into three categories: waveform, pointed, and straight. There was no significant influence of age on skull narrowness. More narrow skulls could be observed in dehorned cows than in horned cows. Dehorned cows had more pointed skull shapes, less waveform shapes, and less straight skulls. Whether these anatomic variances affect the wellbeing of cattle and how this alteration is exactly proceeding during growth should be examined in further studies.
Tipo: Conference paper, poster, etc. Palavras-chave: Beef cattle; Breeding and genetics.
Ano: 2017 URL: http://orgprints.org/31723/1/Unterscheiden%20sich%20die%20Sch%C3%A4delformen%20von%20behornten%20und.pdf
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