New research shows that chickens were extensively bred throughout southern Central Asia from 400 BCE to the medieval era, and their spread was probably facilitated by the ancient Silk Road.
Chickens are one of the most economically important animals in the world today. Yet, the story of how they originated and spread throughout the ancient world remains largely unclear. Recent advancements in archaeological methodologies have unveiled that numerous bone discoveries, once believed to be evidence of early chickens, actually belong to wild birds.
Now, in a new publication, an international team of archaeologists, historians, and biomolecular scientists present the earliest clear evidence for the raising of chickens for egg production, and argue that the loss of seasonal egg laying was the main driver for the dispersal of domestic chickens across Eurasia and northeast Africa.
Discovery and Analysis
Using eggshell fragments collected from 12 archaeological sites spanning roughly 1500 years, the researchers show that chickens were widely raised in Central Asia from approximately 400 BCE to 1000 CE and were likely dispersed along the ancient Silk Road. The abundance of eggshells further suggests that the birds were laying out of season. It was this trait of prolific egg laying, the researchers argue, that made the domestic chicken so attractive to ancient peoples.
To reach these conclusions, the team collected tens of thousands of eggshell fragments from sites located along the main Central Asian corridor of the Silk Road. They then used a method of biomolecular analysis called ZooMS to identify the source of the eggs. Much like genetic analysis, ZooMS can make species identifications from animal remains such as bone, skin, and shell, but it relies on protein signals rather than DNA. This makes it a faster and more cost-effective option than genetic analysis.
“This study showcases the potential of ZooMS to shed light on human-animal interactions in the past,” says Dr. Carli Peters, researcher at the Max Planck Institute of Geoanthropology and first author of the new paper.
Findings and Implications
The identification of these shell fragments as chickens, and their abundance throughout the sediment layers at each site, led the researchers to an important conclusion: the birds must have been laying more frequently than their wild ancestor, the red jungle fowl, which nests once per year and typically lays six eggs per clutch.
“This is the earliest evidence for the loss of seasonal egg laying yet identified in the archaeological record,” says Dr. Robert Spengler, leader of the Domestication and Anthropogenic Evolution research group and principal investigator on the study. “This is an important clue for better understanding the mutualistic relationships between humans and animals that resulted in domestication.”
Taken together, the new study suggests an answer to the age-old riddle of the chicken and the egg. In Central Asia, evidence suggests that the ability to lay a multitude of eggs is what made the chicken the chicken we know today – a global species of enormous economic importance. The authors hope that this study will demonstrate the potential of new, cost-effective methods and interdisciplinary collaboration to address long-standing questions about the past.
Reference: “Archaeological and molecular evidence for ancient chickens in Central Asia” by Carli Peters, Kristine K. Richter, Shevan Wilkin, Sören Stark, Basira Mir-Makhamad, Ricardo Fernandes, Farhod Maksudov, Sirojidin Mirzaakhmedov, Husniddin Rahmonov, Stefanie Schirmer, Kseniia Ashastina, Alisher Begmatov, Michael Frachetti, Sharof Kurbanov, Michael Shenkar, Taylor Hermes, Fiona Kidd, Andrey Omelchenko, Barbara Huber, Nicole Boivin, Shujing Wang, Pavel Lurje, Madelynn von Baeyer, Rita Dal Martello and Robert N. Spengler III, 2 April 2024, Nature Communications.
DOI: 10.1038/s41467-024-46093-2
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