silkies.mp4

Grabber

Did you know that Silkie Chickens are dinosaurs and that you can trace their lineage to prove so?

Silkies are renown living dinosaurs with economic and societal importance ranging from social pets to exquisite delicacies .

Geological time scale

Gallus gallus domesticus

Silkie chickens are a breed of domestic chicken rather than a separate species.

Domestic chickens originated approximately 8,000–10,000 years ago from the wild Red Junglefowl in Southeast Asia.
The Silkie breed likely developed in Asia over 1,000 years ago.
Historical records describing Silkies date back to the travels of Marco Polo during the 13th century.

History

Small feathered theropod dinosaurs evolve during the Jurassic Period. These dinosaurs are the ancestors of modern birds. ~165–150 Million Years Ago

Early bird-like animals such as Archaeopteryx appear.~150 Million Years Ago

The asteroid impact causing the Cretaceous–Paleogene extinction event wipes out most dinosaurs. Bird ancestors survive.66 Million Years Ago

Modern bird groups diversify after the extinction event.50–30 Million Years Ago

The order Galliformes (chickens, pheasants, turkeys, quail) becomes established.20–10 Million Years Ago

The wild Red Junglefowl evolves in Southeast Asia.~5 Million Years Ago

Humans domesticate Red Junglefowl, creating the ancestors of all domestic chickens.8,000–10,000 Years Ago

Selective breeding in Asia produces unique breeds including the Silkie.~1,000+ Years Ago

More than 25 billion chickens exist worldwide, making them one of the most abundant bird species on Earth. Silkies are primarily kept as pets, exhibition birds, and brood hens.Today

Contributions to Natural selection

Viruses such as Marek's disease add selective pressure.
MHC immune-system genes help chickens survive infections
Natural selection increases frequencies of these genes.
Silkies have strong maternal care behaviors that help young survive.
disease resistance and social behaviors helps chicks survive.

Genetics and Variations

Silkie feathers

Mutation in PDSS2 gene

Fluffy appearance caused by lack of hooklets.
New feather structure from mutation.

Fibromelanosis

rearrangement caused by EDN3 gene
Produces melanin throughout the body.
causes black skin, muscles, bones, and connective tissue.

Polydactyly

five toes instead of standard 4
variation in body structure caused by gene

Head variation

Blue earlobes instead of red or white
crest is feathered

Evolution Of Gallus gallus domesticus

Contributions to mankind

Food & Nutrition

Eggs are a major source of protein.
Chicken meat is one of the world's most consumed meats.
Silkies are used in traditional soups in parts of Asia.

Agriculture & Economy

Provide income for farmers.
Help control insects and pests.
Produce manure used as fertilizer.

Science & Education

Chicken embryos are used to study growth and development.
Help researchers understand genetics and evolution.
Demonstrate the evolutionary link between birds and dinosaurs.

References:

Zhu, Y., Yakhkeshi, S., Yusuf, A., & Zhang, X. (2025). Frontiers and emerging topics in a century of Silkie chicken research: Insights, challenges, and opportunities. Poultry Science, 104(5), 105030. https://doi.org/10.1016/j.psj.2025.105030

Oklahoma State University. (n.d.). Silkie bantam chicken. Breeds of Livestock. https://breeds.okstate.edu/poultry/chickens/silkie-bantam-chickens.html

Zhu, Y., Yakhkeshi, S., Yusuf, A., & Zhang, X. (2025). Frontiers and emerging topics in a century of Silkie chicken research: insights, challenges, and opportunities. Poultry Science, 104(5), 105030. https://doi.org/10.1016/j.psj.2025.105030

Bertzbach, L. D., Tregaskes, C. A., Martin, R. J., Deumer, U.-S., Huynh, L., Kheimar, A. M., Conradie, A. M., Trimpert, J., Kaufman, J., & Kaufer, B. B. (2022). The Diverse Major Histocompatibility Complex Haplotypes of a Common Commercial Chicken Line and Their Effect on Marek’s Disease Virus Pathogenesis and Tumorigenesis. Frontiers in Immunology, 13. https://doi.org/10.3389/fimmu.2022.908305

Dalgaard, T. S., Højsgaard, S., Skjødt, K., & Juul‐Madsen, H. R. (2003). Differences in Chicken Major Histocompatibility Complex (MHC) Class Iα Gene Expression between Marek’s Disease‐Resistant and ‐Susceptible MHC Haplotypes. Scandinavian Journal of Immunology, 57(2), 135–143. https://doi.org/10.1046/j.1365-3083.2003.01207.x

Feng, C., Gao, Y., Dorshorst, B., Song, C., Gu, X., Li, Q., Li, J., Liu, T., Rubin, C.-J., Zhao, Y., Wang, Y., Fei, J., Li, H., Chen, K., Qu, H., Shu, D., Ashwell, C., Da, Y., Andersson, L., & Hu, X. (2014). A cis-Regulatory Mutation of PDSS2 Causes Silky-Feather in Chickens. PLoS Genetics, 10(8), e1004576. https://doi.org/10.1371/journal.pgen.1004576