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Recommandations alimentaires pour les vaches de réforme à l’engrais. Développement d’un modèle d’estimation de la composition du gain de poids et des besoins associés

Abstract : Feeding recommendations established in 1988 consider the live weight and the live weight gain to estimate the energetic requirements for fattening. They do not allow for the age, the frame size or the body condition score. In order to update the feeding recommendations for growing and fattening bovine, we have developed a predictive model, called VDR, in order to estimate the requirements for fattening culled cows. This paper outlines the factors that contribute towards the variations of live weight gain and gain composition for culled cows. The paper goes on to describe the VDR model by summarising the developments from previous modelling approaches and outlining the assumptions and equations of the model. The VDR model combines a growth model for the cow during its productive period and a model for the fattening period. Parameterisation was done for Charolais, Limousine and Holstein cows. Validation using data from Charolais cows shows that VDR explains about 80% of the variability in energetic requirements. A comparison with the recommendations from 1988 quantifies the improvements obtained with VDR. The last section describes the construction of a table that allows the energy requirements for culled cows to be estimated easily.
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Florence Garcia, Jacques Agabriel. Recommandations alimentaires pour les vaches de réforme à l’engrais. Développement d’un modèle d’estimation de la composition du gain de poids et des besoins associés. Productions animales, Institut National de la Recherche Agronomique, 2007, 20 (2), pp.137-150. ⟨hal-02653469⟩

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