Phenotypes

Vaiman et al. (2022): "The genome of two affected animals was sequenced ... . ... two fully linked mutations in exon 24 of the MYH3 (myosin heavy chain) gene were detected: a 1-bp non-synonymous substitution (BTA19:g.29609623A>G) and a 11-bp frameshift deletion (BTA19:g.29609605-29609615del). These two mutations were specific to the Limousine breed, with an estimated allele frequency of 2.4% and are predicted to be deleterious. ... mRNA and...

For information relating to Bos indicus cattle see: OMIA 001199-9915 : Coat colour, extension in Bos indicus

Braun et al. (2021): "Filtering whole genome sequencing data revealed a private frameshift variant within the candidate gene ZIC2 in the affected calf. . . . A 1-bp deletion (g.80722845TC>T; ARS-UCD1.2:g.76742066TC>T) in exon 4 of the candidate gene ZIC2 . . . was heterozygous in the affected calf and homozygous wild type in both parents and all other Limousin herdmates and private controls. . . . The origin of this variant is most likel...

Because of the obvious homology of this disorder with the homologous human disorder, Drögemüller et al. (2001) proposed that the bovine disorder be called by the name of its human homologue, which is now done in this catalogue. The earlier names are listed here as species-specific names [Frank Nicholas 20 June 2002].

Besser et al. (1990) reported a congenital syndrome of long, thin limbs, severe joint and tendon laxity, microspherophakia, ectopia lentis, heart murmurs and aortic dilatation in 7 calves, where all sired by a single phenotypically normal bull suspected of germline mosaicism for a new mutation resulting in this disease. One of the calves died with ruptured aorta at age 16 months. Histopathologic and electron microscopic studies of the aortic m...

The double-muscle trait in cattle is characterised by an increase in muscle mass of approx 20%, resulting in substantially higher meat yield, a higher proportion of expensive cuts of meat, and lean and very tender meat, for which a substantial premium is paid. The trait is autosomal recessive, and the locus has been given the symbol mh. It occurs at such a high frequency in Piedmontese and Belgian Blue cattle that it is characteristic of these...

The report of the use of a DNA genotyping test by Healy et al. (1995), citing a personal communication from G.S. Johnson at the University of Missouri, implied that the molecular basis of this disorder within the gene for ferrochelatase had been determined by Dr Johnson. Jenkins et al. (1998) appear to have been the first to publicly report the molecular basis of this disorder. They did so by cloning and sequencing a very likely comparative ca...

Syndactyly has been reported in many breeds of cattle in many countries. Most of the documentation, however, concerns its occurrence in US Holsteins, where, as a result of the siring of more than 60,000 calves by a bull who was subsequently shown to be a carrier, the disorder attracted considerable attention (Anon., 1967). The possibility that artificial selection favouring heterozygotes may have contributed to the unacceptably high frequency ...