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Mieux valoriser la production des prairies pâturées et réduire le gaspillage, c’est possible !

Abstract : In grazing systems, a great utilisation rate of grasslands occurs when management practices allow animals to consume a large proportion of the grass produced. Grass production can vary greatly depending on pedoclimatic conditions, grassland type, and agricultural practices (e.g., fertilisation, amendment, irrigation). A high utilisation rate is primarily achieved thanks to a low post-grazing sward height (i.e., grazing intensity is severe), although overgrazing should be avoided. The slight decrease in milk yield per animal that occurs under severe grazing conditions is more than made up for by greater annual milk yield per hectare. Several grassland or livestock indicators exist to gauge grazing severity following each grazing rotation in a given paddock. Grazing severity is largely independent of grazing management strategy (e.g., grazing system, grazing rotation duration, paddocks number), which, from a practical perspective, rarely intrinsically affects milk yield and grassland utilisation rate. On the contrary, the grassland utilisation rate may differ by between 1 t DM/ha/year (short grazing season) and 3 t DM/ha/year (long grazing season) based on whether grazing is lax (i.e., seeks to maximise individual intake) or severe (i.e., seeks to maximise intake per hectare). Recent results from commercial farms have shown that grassland utilisation rates range between 4 and 13 t DM/ha/year, depending on the paddock, in each of the French regions studied (east, centre, west).
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Contributor : Emilie Bernard <>
Submitted on : Friday, August 7, 2020 - 9:36:12 AM
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Remy Delagarde. Mieux valoriser la production des prairies pâturées et réduire le gaspillage, c’est possible !. Fourrages, Association Française pour la Production Fourragère, 2020, 241, pp.1-10. ⟨hal-02912929⟩



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