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L'étude de la variabilité intra-individuelle de la composition isotopique en azote du collagène osseux sur une série de mandibules de bœuf du site néolithique de Bercy (Paris, début du IV e millénaire av. J.-C.) a montré que les jeunes bovins y étaient sevrés à un âge compris entre 6 mois et 1 an. Ce résultat ne contredit pas l'interprétation du pic de mortalité des individus âgés de 6 à 12...
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