Reference : Differentiating pre- and post-grazing pasture heights using a 3D camera: a prospectiv...
Scientific congresses and symposiums : Paper published in a book
Life sciences : Phytobiology (plant sciences, forestry, mycology...)
Life sciences : Agriculture & agronomy
http://hdl.handle.net/2268/215034
Differentiating pre- and post-grazing pasture heights using a 3D camera: a prospective approach
English
Andriamandroso, Andriamasinoro mailto [Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions animales et nutrition >]
Castro Muñoz, Eloy mailto [Université de Liège - ULiège > > > Doct. sc. agro. & ingé. biol. (Paysage)]
Blaise, Yannick mailto [Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions animales et nutrition >]
Bindelle, Jérôme mailto [Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions animales et nutrition >]
Lebeau, Frédéric mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges >]
Sep-2017
Precision Livestock Farming ‘17
Berckmans, Daniel mailto
Keita, Alassane
238 - 246
Yes
No
International
8th European Conference on Precision Livestock Farming.
du 12 septembre au 14 septembre 2017
Nantes
France
[en] pasture heights ; grazing ; 3D camera
[en] Grasslands management involves the monitoring of both animal and plant components. Recent precision livestock farming developments have focused on high-rate monitoring of grazing animals to enhance livestock productivity and welfare. The evolution of grass resource during the grazing process is not being overlooked by graziers and researchers, but grass characteristics, such as height, dry matter content, productivity or density, are still measured using low
frequency and sometimes destructive and time-consuming methods; such as quadrat, sward-sticks, rising plate meters. This study investigated the potential of using 3D cameras to assess sward physical characteristics. Main objectives were: (1) to define the correct way to capture images, particularly the camera position above the ground and, (2) to assess if differences in sward height were detectable. Couples of images differing in grass height were captured on the same spot with a 3D camera at different above-ground heights (30, 40, 50 cm) on a ryegrass-white clover pasture. Pregrazing height was 15cm and post-grazing sward was simulated by cutting at 2 cm. Histograms of intensity performed on greyscale images showed differences
between pre- and post-grazing sward. As expected, overall darker pixels were observed for pre-grazing images (p<0.01) and whiter pixels for post-grazing images (p<0.01), indicating longer distances consistent with lower forage biomass. Images taken at a distance of 30 and 40 cm could identify these differences. Further developments require improving the calibration of the camera and developing image analysis method to estimate more plant characteristics such as density or dry matter content.
Gembloux Agro-Bio Tech
ULg ; ARES
Researchers ; Professionals
http://hdl.handle.net/2268/215034

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