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 404 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 870 631 411 362 306 263 244 123 104 1006 4420
Mendelian trait/disorder 400 298 137 133 118 61 136 74 24 344 1792
Mendelian trait/disorder; likely causal variant(s) known 339 205 104 65 55 48 56 14 17 192 1112
Likely causal variants 496 270 173 72 86 105 71 18 30 156 1496
Potential models for human traits 558 323 268 203 131 146 84 72 50 571 2452