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Etude de la sensiblité de la reproduction des vaches allaitantes aux trajectoires nutritionnelles adaptatives : une approche par modélisation

Abstract : Beef cattle reproduction depends on nutritional status. Until now, relations between nutrition and reproduction focused on static nutritional variables and on few components of the reproductive performance. This work aims to propose a dynamic framework of the interrelations between nutrition and reproduction to better understand it and to simulate succession of reproductive cycles. Due to economic and climatic context, nutritional constraints may occur all around the nutrition cycle whatever the physiological status. A dynamic approach allowed studying the sensitivity of reproductive performance to body lipid quantity and change. Based on a conceptual approach developed in dairy cows, a conceptual framework of the interrelations between nutrition and reproduction has been realized. This proposes two body lipid trajectories: without nutritional constraint and under nutritional constraint (adaptive trajectory). Difference between theses trajectories influences the different components of the reproductive performance. Experimental data from Charolais cows in a not constraining environment and under nutritional constraints allowed quantifying these conceptual interrelations between nutrition and reproduction. A computer model has been built to test the sensitivity of reproductive performance to varying nutritional environments.
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Emilie Recoules. Etude de la sensiblité de la reproduction des vaches allaitantes aux trajectoires nutritionnelles adaptatives : une approche par modélisation. Agronomie. Université Blaise Pascal - Clermont-Ferrand II, 2013. Français. ⟨NNT : 2013CLF22347⟩. ⟨tel-01875709⟩

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