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Master thesis

La production valorisée des prairies permanentes en système bovin laitier autonome

Abstract : From 2005 to 2015, an organic and pasture-based dairy system was designed to farm a 40 Montbéliarde and Prim'Holstein cow herd on the experimental station of the ASTER research unit in Mirecourt (Vosges. Cows had an access to 22 plots of permanent grassland in a rotational grazing system. he purpose of this study is to summarize the production rate of the herd accessible pastures, in regard to the spatial and year-to-year variability of utilization. Total pasture utilisation rate and grazing part (in kg DM/ha) were calculated using the computerized version f a new French tool named Herb'Valo (Delagarde et al., 2017). It registers pasture utilization events and calculates grazing pasture ingestion. The main needed information have been found out from the ASTER-ix and ALADIN data base of the research unit, pasture scheldule plans and grass-growing data. Results have been analyzed, taking several parameters into account : plot-specific characteristics, utilisation type and climatic conditions each year. Data were treated with the statistical analysis software R. Overall, the mean total pasture utilisation rate settled at 5 283 +- 1 383 kg DM/ha/year while the grazing part was 67%. Statistical analysis identified 9 groups of 10 to 64 plot-years entities. They enhanced different pasture utilization rates associated to the combined plot-characteristics, practices applied over the 11 years experiment. The grazing part in total production is variable in the groups, as it depends on the very different relevant climatic conditions over the years.
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https://hal.inrae.fr/hal-03147112
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Submitted on : Friday, February 19, 2021 - 3:44:48 PM
Last modification on : Tuesday, April 6, 2021 - 2:34:29 PM
Long-term archiving on: : Thursday, May 20, 2021 - 7:46:32 PM

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  • HAL Id : hal-03147112, version 1

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Morgane Le Bris. La production valorisée des prairies permanentes en système bovin laitier autonome. Sciences du Vivant [q-bio]. 2017. ⟨hal-03147112⟩

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