Calcium isotopes in archaeological bones and their relationship to dairy consumption

The calcium isotope ratios (δ^44/42Ca) of bones from humans and fauna from three archaeological sites, Taforalt, Abu Hureyra, and Danebury, are evaluated in order to assess whether calcium isotope ratios of bones can be used to detect dairy consumption by adult humans. At each site the fauna δ^44/42Ca is the same regardless of species, while the humans have lower δ^44/42Ca than the local animals by 0.24–0.41‰ (site means). However we cannot ascribe this difference to dairy consumption, given this human–faunal difference also occurs in Epipalaeolithic and Mesolithic adult humans, where dairy consumption is unlikely. Rather, this difference appears to be a result of differences in metabolic processes or other aspects of diet between humans and fauna. Minimal isotopic change in sequential acid leaches of bone powders and consideration of the high calcium concentration in bone suggest that bone calcium isotope ratios are not substantially affected by diagenetic change.     

Canada’s Supply Management System and the Dairy Industry in the Era of Trade Liberalization: A Cultural Commodity?

ABSTRACT

Canada’s dairy farmers have spent the last 40 years fighting to preserve their supply management system despite increases in the desire to liberalize trade through the expansion of regional free trade agreements and the targeting of agriculture in recent rounds of the General Agreement on Tariffs and Trade (GATT). How has Canada’s supply management system resisted trade liberalization thus far? Moreover, what strategies have Canadian dairy farmers used to lobby the government to preserve this system? The answer to these questions lay within the intersection of culture and economics. Canadian dairy farmers have been successful in framing Canadian dairy as a distinctly Canadian cultural commodity, and therefore framing supply management as the economic tool needed to defend this cultural commodity. In exploring this topic, this article will touch on Canada’s history of preserving cultural institutions, as well as the historical importance of Canada’s supply management system.