Significance
Goats were among the first domestic animals and today are an important livestock species; archaeozoological evidence from the Zagros Mountains of western Iran indicates that goats were ...managed by the late ninth/early eighth millennium. We assess goat assemblages from Ganj Dareh and Tepe Abdul Hosein, two Aceramic Neolithic Zagros sites, using complementary archaeozoological and archaeogenomic approaches. Nuclear and mitochondrial genomes indicate that these goats were genetically diverse and ancestral to later domestic goats and already distinct from wild goats. Demographic profiles from bone remains, differential diversity patterns of uniparental markers, and presence of long runs of homozygosity reveal the practicing and consequences of management, thus expanding our understanding of the beginnings of animal husbandry.
The Aceramic Neolithic (∼9600 to 7000 cal BC) period in the Zagros Mountains, western Iran, provides some of the earliest archaeological evidence of goat (
Capra hircus
) management and husbandry by circa 8200 cal BC, with detectable morphological change appearing ∼1,000 y later. To examine the genomic imprint of initial management and its implications for the goat domestication process, we analyzed 14 novel nuclear genomes (mean coverage 1.13X) and 32 mitochondrial (mtDNA) genomes (mean coverage 143X) from two such sites, Ganj Dareh and Tepe Abdul Hosein. These genomes show two distinct clusters: those with domestic affinity and a minority group with stronger wild affinity, indicating that managed goats were genetically distinct from wild goats at this early horizon. This genetic duality, the presence of long runs of homozygosity, shared ancestry with later Neolithic populations, a sex bias in archaeozoological remains, and demographic profiles from across all layers of Ganj Dareh support management of genetically domestic goat by circa 8200 cal BC, and represent the oldest to-this-date reported livestock genomes. In these sites a combination of high autosomal and mtDNA diversity, contrasting limited Y chromosomal lineage diversity, an absence of reported selection signatures for pigmentation, and the wild morphology of bone remains illustrates domestication as an extended process lacking a strong initial bottleneck, beginning with spatial control, demographic manipulation via biased male culling, captive breeding, and subsequently phenotypic and genomic selection.
This chapter is based on our recent investigations into the subsistence economy at a military fort in the northern Caucasus (in modern Georgia), in comparison with sites along the Gorgan Wall in the ...north-east of Iran. The latter include forts and settlements in the hinterland. These studies highlight the diversity of animal consumption during the Sasanian era, influenced by the environmental setting of the sites, general agro-pastoral practices in the study regions and different cultural traditions. In all cases, however, herded animals (sheep/goats and cattle) provided most of the animal protein, complemented by the exploitation of other resources such as
The type of grass made available to cows and, more specifically, the proportion of legumes influences the quality of dairy products, including milk. Here, we carried out 6 experiments whose results ...underscore how forage legumes affect milk quality, namely fatty acid composition and equol levels. When animals are given silage, legumes are better than grasses for improving milk fatty acid composition. Similarly, whether animals are grazing or green fed, forage legumes, and especially red clover, increase milk equol levels. When milk is processed to create dairy products, equol levels remain consistent. With the exception of organically produced milk, commercially available milk has much lower levels of equol than did the milk produced by our experimental animals given access to legumes.
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