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Master Thesis

La valorisation de zones humides par et/ou pour les animaux dans les élevages laitiers de grande taille

Abstract : Natural wet meadows are sensitive areas largely recognized for their benefits. By controlling vegetation, livestock farming contributes to their preservation, and also benefits of interesting forage. Those lands are hardly farmable (reduced surface, limited accessibility), sometimes resulting in fallow land. As size of dairy cattle herd is increasing, it is of importance to successfully combine large competitive herds and small sensitive areas. Trials were then performed in an experimental farm, with 2 herds of 20 (M) and 49 (XL) dairy heifers. Studies aimed at comparing wet meadows management, on a same surface either per herd (3.163 acres) or per animal (0.064 and 0.158 acres) basis. On similar grazing duration and surface per animal (0.079 acres/heifer/d), continuous grazing management used for M herd resulted in better growth results than rotational grazing management for XL herd: + 8 kg for a 20 days trial experiment (P < 0.05). Pasture growth after grazing was not affected by size herd and management. Animal activity was not different between herds, and did not repeat within or between identical plots. Social behaviors were similar between herds. With the large herd (XL), over-grazed areas or areas being used for specific activities areas were identified. Risks of increased damaged of meadows (stamping, environmental impact) were then possible. To conclude, large herd grazing on small wet meadows seems possible, but need some precautions.
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Master Thesis
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Submitted on : Monday, December 1, 2014 - 3:25:47 PM
Last modification on : Monday, July 6, 2020 - 3:38:21 PM
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Émeline Cornet. La valorisation de zones humides par et/ou pour les animaux dans les élevages laitiers de grande taille. Sciences agricoles. 2014. ⟨dumas-01089345⟩

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