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 392 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 869 629 409 360 304 260 243 121 104 992 4391
Mendelian trait/disorder 399 298 136 133 118 61 136 74 24 342 1788
Mendelian trait/disorder; likely causal variant(s) known 338 205 103 65 55 48 56 14 17 190 1108
Likely causal variants 494 270 172 72 86 105 71 18 30 156 1493
Potential models for human traits 557 322 266 203 131 146 84 72 50 568 2445