Growth hormone receptor (GI-T) has a major role in the regulation of g
rowth hormone action, and thus, is an obvious candidate gene associate
d with milk production traits in mammals. The present authors have seq
uenced 273 bp of the 3' flanking region of the bovine GHR, and found t
hree length variants and one base substitution polymorphism in this re
gion. Allele frequencies of the length variants differ between Finnish
native and commercial dairy cattle breeds. The chromosomal localizati
on of GHR was confirmed to bovine chromosome 20 by synteny mapping and
linkage analysis.