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Nutrition of goats, sheep and cattle in tropical and warm conditions « Evaluation of energy and protein requirements and animal responses to diet. Evaluation of INRA system to predict nutritive value of forage resources »

Abstract : The overall aim of the thesis project was to generate knowledge to contribute to the development of good feeding practices for sheep goats and cattle in warm regions. The methodology used in this project crossed meta-analysis to an experimental approach. The maintenance energy requirements of goats, sheep and cattle in warm regions are higher than those of ruminants in temperate regions. These differences were partly attributed to the capacity of livestock genotypes of these regions to mobilize a fraction of the nutrients ingested for unproductive functions adaptation to stress and the energy cost of ingestion and digestion of more fibrous diets. The estimation for the energy requirements for production was the same order of magnitude as the genotypes of temperate regions. Our estimates of protein requirements for maintenance and production show that they are higher with tropical genotypes compared to temperate genotypes.The hierarchy of needs between species varies with their modes of expression (expression of metabolic weight).The energy and protein supply unit system of INRA, based on a mechanistic approach to the use of feed, potentially leads to a good assessment of food resources. However, some factors must be revised to reflect the specific composition of forage resources in warm regions.
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Nizar Salah. Nutrition of goats, sheep and cattle in tropical and warm conditions « Evaluation of energy and protein requirements and animal responses to diet. Evaluation of INRA system to predict nutritive value of forage resources ». Agricultural sciences. AgroParisTech, 2015. English. ⟨NNT : 2015AGPT0011⟩. ⟨tel-02004274⟩

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