A metrical analysis of a collection of modern goats (Capra hircus aegargus and C. h. hircus) from Iran and Iraq: Implications for the study of caprine domestication

A critical comparison of two commonly used markers of initial animal domestication, size reduction and demographic profiling, is presented. A metrical analysis of a large collection of modern wild and domestic goats (Capra hircus aegargus and C. h. hircus) from Iran and Iraq clearly demonstrates that sex is by far the most significant factor affecting size in goats. In all post-cranial bones examined, those of males, even the unfused bones of males over 1 year of age, are absolutely larger than the bones of females. Region also plays a significant role in the size of these animals, but domestic status seems to have little impact. Similarly, a re-analysis of archaeological assemblages from Upland Sites the eastern fertile crescent shows no evidence of population-wide size reduction over a period that encompasses the transition from hunting to herding goats in the region, from the Middle Palaeolithic to the Early Neolithic. The apparent rapid reduction in the size of caprines during the early phases of domestication noted in earlier studies is likely attributable to a shift in the sex ratio of the adult breeding population of managed herds towards female domination, plus the differential destruction and loss of the bones of male animals killed at younger ages, as well as biases introduced by standard methodological practices. Building on the earlier work of Hesse, and using the empirical understanding of the factors influencing size in modern goats gained in this study, a new approach is proposed that combines both size and long-bone fusion data to construct high resolution, sex-specific age profiles of male and female goats that can be used to detect the hunting to herd management transition which marks the initial stages of the domestication process. Copyright 2001 Academic Press