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Conduite alimentaire de la jument en lactation au pâturage : influence sur l'ingestion, la couverture des besoins et l'état parasitaire

Abstract : Sustainable horse breeding requires increasing the proportion of herbage in horse diet without affecting animal performance. Horses with high requirements such as lactating mares are commonly supplemented at pasture, while the consequences of energy supplementation on intake and performance remain unknown. Another priority is to identify alternatives to chemical anthelmintic for gastro-intestinal parasite management in order to limit the spread of antibiotic resistance and the dumping of pharmaceutical residues into the environment. A first experiment showed that supplementing lactating mares at pasture should not be systematic because, under non-limiting conditions, their adaptive capacities enabled them to increase herbage intake up to 28 g DM.kg LW -1 .d -1 and ensure foal growth. In addition, energy supplementation did not allow mares to better regulate their parasite burden. A second experiment allowed us to precise the herbage allowance threshold below which energy supplementation is required. Under strip-grazing conditions it was estimated at 66 g DM.kg LW -1 .d -1 , which corresponds to a post-grazing height of 5.4 cm using sward stick. A third experiment has revealed the potential of secondary metabolites of sainfoin to reduce the nematode larval development, while no effect was observed with a short-term protein supplementation. These original results have practical implications for a better management of lactating saddle mares at pasture.
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Claire Collas. Conduite alimentaire de la jument en lactation au pâturage : influence sur l'ingestion, la couverture des besoins et l'état parasitaire. Sciences agricoles. Université Blaise Pascal - Clermont-Ferrand II, 2014. Français. ⟨NNT : 2014CLF22514⟩. ⟨tel-01226843⟩

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