Technical Abstract: Previously we found that differences among beef bulls in their growth hormone response to intravenous injection of growth-hormone releasing hormone are related to differences in growth performance and carcass composition. We believe that these differences are mediated at the GHRH-R and that the gene may be an important candidate gene controlling growth performance and carcass traits in beef cattle. Therefore polymorphisms within the genes could be used to investigate the gene's association with economically important traits. One restriction fragment length polymorphism was identified within a PCR amplification product of the bovine GHRH-R gene using the restriction enzyme Eco57I and was used to map the gene in the MARC mapping reference population. The gene was mapped to bovine chromosome 4 between markers INRA072 and BMS3013, providing additional support to the orthologous relationship among bovine chromosome 4, human chromosome 7, and porcine chromosome 18.