Originally Posted By: KazJaps
The following 2017 paper compares various mutations/phenotypes in chickens, pigeons etc (eg naked neck, frizzle, silky feathers, foot feathers (ptilopody), crests, etc

Boer EF, Van Hollebeke HF, Shapiro MD.
Genomic determinants of epidermal appendage patterning and structure in domestic birds.
Dev Biol. 2017 Sep 15;429(2):409-419. doi: 10.1016/j.ydbio.2017.03.022. Epub 2017 Mar 24.
Another 2017 paper on pigeons:

Domyan, E. T., & Shapiro, M. D. (2017).
Pigeonetics takes flight: evolution, development, and genetics of intraspecific variation.
Developmental Biology, 2017 427(2), 241250. http://doi.org/10.1016/j.ydbio.2016.11.008

Added paper link