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RESEARCH PRODUCT

Prediction Models for Age-at-Death Estimates for Calves, Using Unfused Epiphyses and Diaphyses

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For cattle (Bos taurus), age estimations using dental criteria before the eruption of the first molar (3-8months) have large error margins. This hampers archaeozoological investigation into perinatal mortality or the putative slaughtering of very young calves for milk exploitation. Previous ageing methods for subjuveniles have focused on the length of unfused bones, but it is rarely possible to use them because they are restricted to foetuses and because of the fragmentation of bones. This paper presents new age prediction models based on length, breadth and depth of post cranial bones produced from a dataset of modern calves (n=27). This reference collection was compiled from material of known age at death, sex and breed from collections in Britain, France, GermanyandSwitzerland. Linearregressionmodels wereconstructedusingthemodern data for age prediction, andthesemodelswerethensuccessfullytestedandassessedusingaMiddleNeolithicassemblageofcomplete calves' skeletons from Bourguignon-Les-Morey, France. From the assessment, the astragalus and metapodials were determined to be the most reliable bones, and the femur was the worst. Measurements of the epiphyseal and distal elements and depth measurements were the most reliable. For ages before 12months, these models can provide ±1month age estimates. Copyright © 2013 John Wiley & Sons, Ltd.