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Variations et estimation de la valeur protéique des sources azotées dans l’alimentation des vaches laitières

Abstract : Saving vegetable protein in the nutrition of dairy cows is a major challenge for the dairy sector. This objective can be achieved on the one hand by limiting the degradation of proteins in the rumen to increase the proportion of non-degraded feed proteins available in the intestine and on the other hand by formulating the rations as close as possible to the protein requirements of the animals, which requires a method of accurate estimation of the protein feed value. The firstpart of this thesisfocuses on the influence of particle size and specific density on their rumen retention time. The results obtained with plastic particles show that size and density can be used to reduce the mean retention time in the rumen. The second part of this thesis aims at setting up a new methodology for estimating feed protein value based on the biological responses of animals compared to the in vivo reference method. The two responses tested (plasmatic amino acids or milk protein yield) both give an accurate estimate of the feed protein value, but the response of milk protein yield seems to be preferable since it is better known and does not depend on the protein source used
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Florence Dufreneix. Variations et estimation de la valeur protéique des sources azotées dans l’alimentation des vaches laitières. Biologie animale. Agrocampus Ouest, 2019. Français. ⟨NNT : 2019NSARB322⟩. ⟨tel-02885897⟩

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