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Modélisation systémique des performances des femelles de ruminants. Application au cas de la vache laitière.

Abstract : This work concerns the building of a dairy cow model. The whole model is composed of three dynamic, mechanistic and deterministic models corresponding to three different levels of representation of the cow. Each model has a specific functionality. These models, respectively teleonomic, energetic and metabolic are linked through a hierarchical structure. The teleonomic model consists in a representation of the animal seen as a living organism ensuring its own survival and the continuation of its species. This model is aimed at driving the energic model. The model describes the dynamic of the priorities of a female mammal between physiological functions along its lifetime punctuated by successive reproductive cycles. This model produces a reference trajectory used to control the energetic model trough two paths corresponding to homeorhesis and homeostasis. The energetic model consists in a representation of the animal energetic metabolism and is aimed at predicting performance. The model describes the dynamic partitioning of energy intake. The model simulates performance (growth, body reserves, maintenance, gestation, lactation, intake of a dairy cow throughout lifetime and during reproductive cycles. The metabolic model consists in a representation of the animal metabolism at the inter-organ level and is aimed at interpreting performance predicted by the energetic model as metabolites flows. The model describes the dynamic of flows of metabolites associated with material flows of the energetic model during lactation (milk yield, intake, body weight changes). The model simulates liver triacylglycerides and plasma metabolites contents during lactation.
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https://pastel.archives-ouvertes.fr/pastel-00625801
Contributor : Jonga Dequeant <>
Submitted on : Thursday, September 22, 2011 - 4:43:16 PM
Last modification on : Saturday, June 6, 2020 - 3:47:47 AM
Long-term archiving on: : Friday, December 23, 2011 - 2:30:28 AM

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  • HAL Id : pastel-00625801, version 1
  • PRODINRA : 246090

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Olivier Martin. Modélisation systémique des performances des femelles de ruminants. Application au cas de la vache laitière.. Alimentation et Nutrition. AgroParisTech, 2009. Français. ⟨NNT : 2009AGPT0050⟩. ⟨pastel-00625801⟩

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