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Department of Archaeology


Publication details for Dr Janet Montgomery

Towers, Jacqueline, Mainland, Ingrid, Montgomery, Janet & Bond, Julie (2017). Calving seasonality at Pool, Orkney during the first millennium AD: an investigation using intra-tooth isotope ratio analysis of cattle molar enamel. Environmental Archaeology 22(1): 40-55.

Author(s) from Durham


The identification of dairying is essential if we are to understand economies of the past, particularly in
northwest Europe, where a high degree of lactose tolerance suggests that fresh milk has long been a
significant food product. This paper explores a possible link between economic focus and seasonality of
calving. Although cattle (Bos taurus) can breed throughout the year, animals living in temperate regions
with minimal or no human management tend to breed seasonally, their breeding behaviour being strongly
influenced by the availability of food. In order to achieve a year-round supply of fresh milk in the past, it is
likely that multiple-season calving was necessary, which would have required additional husbandry effort.
Alternatively, for meat-focussed economies or those based on storable dairy products, a strategy of
single-season calving in spring may have been favoured to maximise the utilisation of spring and summer
vegetation. Cattle birth seasonality is investigated through isotope ratio analysis (δ18O, δ13C) of tooth
enamel. Results for cattle from Pool, Orkney dating to the latter part of the first millennium AD suggest that
calving occurred during at least three seasons implying that the continuous provision of fresh milk was of
economic importance.