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How accurate is the Grasshopper(R) system in measuring dry matter quantity of Swiss and Danish grassland?
In: Precision Livestock Farming '19. August 26-29, Hrsg. Organising Committee of the 9th European Conference on Precision Livestock Farming (ECPLF), Teagasc, Animal & Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Fermoy. 2019, 188-193.
The interest in pasture-based dairy systems in Europe increases, as it is a cost-effective way to provide feed. The precise estimation of feed on pastures is complex and laborious. The Grasshopper® system promises a solution. It is a semi-automated rising plate meter to estimate herbage quantity of grasslands. The system measures compressed sward height and calculates the available dry matter (DM) ha-1 using a conversion equation. The herbage density differs among grassland usage, herbage composition and geographical regions. Therefore, we tested the Grasshopper® in Switzerland and Denmark and compared the herbage quantity estimations with laboratory results. We collected fresh herbage samples at four locations in Switzerland and at three locations in Denmark during summer and autumn 2018. The samples were oven-dried at 60 ºC and the quantity of DM ha-1 was calculated. The results indicate a more correct herbage quantity estimation of the Grasshopper® with its original equation for Danish pastures compared to Swiss grassland. As a conclusion, we suggest implementing region-specific herbage density estimations and known seasonal quality changes for the Grasshopper®.