Abstract
Genon proposes a method of increasing productivity based on the fixation of the G2 allele (or long allele) in the promoting region of the growth hormone gene (bGH). The characterization and quantification of the gain deriving from the fixation of the G2 allele in controlled herds of three breeds of zebu (Nelore, Gir and Guzerá) and one bull breed (Caracu), will be undertaken using DNA gen…