Oliveira, Julianne
- Department of Crop Production Ecology, Swedish University of Agricultural Sciences
Conference paper2024Peer reviewed
Spectroscopy for assessing the nutritional value of pastures and enteric methane emissions from dairy cows in northern Sweden
Oliveira, Julianne; Chagas, Juana; Bernes, Gun; Fant, Petra; Angeard, E.; Morel, J.; Ramin, Mohammad
Abstract
We aimed to estimate the nutritional value of leys using short-wave infrared (SWIR) spectroscopy. Samples were collected from 12 different field spots at seven dairy farms in Northern Sweden during summer 2021 and 2022. Sub-samples were chemically analysed for nutrient content, gas production and digestibility, and the remaining material was scanned with the Specim SWIR camera. Multivariate regression and machine learning algorithms were tested to estimate organic matter, crude protein, aNDF, ADF, non-fibre carbohydrates, energy, in vitro true organic matter digestibility, and enteric total gas and methane emissions predicted in vivo, where the SWIR spectral reflectance values were used as explanatory variables. The nutrient chemical composition of pastures varied among farms and months, and higher nutritional value was observed in June and August, irrespectively of year. Preliminary results show satisfactory performances for most quality parameters (R2 ranging from 0.83 to 0.99, normalized RMSE ranging from 0.4 to 5.1) and indicate the potential of spectroscopy to assess pasture quality, making it a viable alternative for nutritional monitoring. We plan to increase the size of the dataset to improve the robustness and generalization of the models.
Keywords
dairy cattle; grazing; pasture nutritional value; remote sensing; spectroscopy
Published in
Grassland Science in Europe
2024, number: 29, pages: 530-532
Title: Why grasslands? : Proceedings of the 30th General Meeting of the European Grassland Federation Leeuwarden, the Netherlands 9-13 June 2024
Publisher: Organising Committee of the 30th General Meeting of the European Grassland Federation
Conference
30th General Meeting of the European Grassland Federation. Why grasslands? 9-13 June 2024, Leeuwarden, the Netherlands
SLU Authors
Chagas, Juana
- Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
- Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
Bernes, Gun
- Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
- Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
Fant, Petra
- Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
- Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
Ramin, Mohammad
- Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
- Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
UKÄ Subject classification
Animal and Dairy Science
Publication identifier
- eISBN: 978-90-903-8494-8
Permanent link to this page (URI)
https://res.slu.se/id/publ/140070