Welcome to OMIA


Online Mendelian Inheritance in Animals (OMIA) is a catalogue/compendium of inherited disorders, other (single-locus) traits, and associated genes and variants in 431 animal species (other than human and mouse and rats and zebrafish, which have their own resources) co-authored by Professor Frank Nicholas and Associate Professor Imke Tammen of the University of Sydney, Australia, with help from many people over the years. OMIA information is stored in a database that contains textual information and references, as well as links to relevant PubMed and Gene records at the NCBI, and to OMIM and Ensembl.

OMIA is manually curated by a team of specialists. If you see an error or wish to submit an entry, please contact us.

To join the OMIA Support Group, register at OMIA Support Group.

From 1st September 2011, the OMIA ID is binomial. To better conform to global standards, in March 2023 the binomial format was changed slightly by replacing a space with a colon, i.e. OMIA:xxxxxx-yyyy.., where xxxxxx is the 6-digit number for a trait/disorder, and yyyy.. is the NCBI species taxonomy id (usually four digits, but sometimes longer).

We have recently launched the Pioneers of Mendelian Inheritance in Animals project (PMIA), an exploration of the history of research into Mendelian inheritance in animals. New entries will be added throughout 2022!


dog cattle cat pig sheep horse chicken rabbit goat Other TOTAL
TOTAL TRAITS/DISORDERS 879 640 413 367 308 267 248 125 115 1069 4532
Mendelian trait/disorder 403 299 138 136 120 62 137 75 25 357 1820
Mendelian trait/disorder; likely causal variant(s) known 341 206 106 66 56 49 58 15 17 200 1131
Likely causal variants 501 271 178 72 89 106 72 19 30 170 1527
Potential models for human traits 564 329 270 207 134 150 86 74 54 603 2518