OMIA:000129-9940 : Blood group system I in Ovis aries (sheep)

In other species: chicken , pig , goat

Categories: Haematopoietic system phene

Mendelian trait/disorder: yes

Considered a defect: no

Key variant known: no

Cross-species summary: Each blood group system consists of a set of blood types, each of which corresponds to a particular antigen (usually a glycoprotein) on the surface of red blood cells. The different types within a system are the result of the action of different alleles at a locus that usually encodes an enzyme that catalyses the creation of the feature of the glycoprotein unique to that type, e.g. the presence of a particular sugar at the end of a short chain of sugars.

Species-specific name: Secretor locus

Species-specific description: This locus has at least 2 alleles, which control the expression of the R blood group system.

Cite this entry

Nicholas, F. W., Tammen, I., & Sydney Informatics Hub. (2020). OMIA:000129-9940: Online Mendelian Inheritance in Animals (OMIA) [dataset].


1985 Nguyen, T.C. :
Evaluation of linkage between the R-O-i and C blood group systems in sheep Animal Blood Groups and Biochemical Genetics 16:13-17, 1985. Pubmed reference: 4003854.

Edit History

  • Created by Frank Nicholas on 06 Sep 2005
  • Changed by Frank Nicholas on 15 May 2020