cDNA was prepared from $poly(A)^+$ mRNA isolated from pituitaries and cloned in E. coli. It contains the coding sequence for bovine growth hormone(bGH). The cloned bGH cDNA was confirmed by colony hybridization, restriction enzyme mapping, and nucleotide sequencing. The cloned cDNA was modified to construct the plasmid that expresses the bovine growth hormone in bacteria. A genomic gene of bovine growth hormone was also cloned using the bGH cDNA as a probe.