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Master thesis

Evaluation environnementale des élevages bovins lait français

Abstract : Nowadays, the study and mitigation of environmental impacts from livestock are major concerns regarding environmental protection. The purposes of this study were 1) to present environmental assessing methods based on Life Cycle Assessment, and 2) to assess the enteric CH4 production of dairy cattle. In France, dairy cattle produces on average 16.9 (+/- 3.3) kg CH4/ 1000L of milk. For one dairy cow, the production is 108.2 (+/- 10.7) kg CH4 per year. Considering the diet composition, the enteric CH4 production is different than with standard diets (18 kg CH4/ 1000L of milk). Diet effects are complex to analyze at the animal scale. The production may change according to concentrates proportion. We compare one diet based on concentrates and another based on corn silage rather than grass. The production is lower for the first one (-6.81 kg CH4/ head). Considering the whole dairy system, to limit unproductive cattle is a good way to reduce enteric CH4 production. Indeed, a system characterize by few unproductive animals and a poor grass diet produces less enteric methane. Changing diet composition and production efficiency can help to reduce enteric methane production.
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https://hal.univ-lorraine.fr/hal-01835545
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Amandine Menet. Evaluation environnementale des élevages bovins lait français. Sciences de l'environnement. 2014. ⟨hal-01835545⟩

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