Summary zoel fadli. testosterone level in various ages of aceh cattle and its relations with the scrotum diameter, body weight and keeping pattern. dasrul and sri wahyuni. aceh cattle is one of the indigenous beef cattle germ plasma that has been long bred in aceh and being used as meat producer and draught worker. although it does not have growth rate better than mix cattle, aceh cattle shown high adaptability to the environmental changes, and able to demonstrate productivity as well as maximum economic efficiency in various limited conditions. however, surveys shown that the aceh cattle population is in an alarming condition and shown downward trend, not only in number but also in the quality of genetic population. even, aceh cattle are an endangered condition if not controlled properly. it is therefore, a necessity to select males with good performance and high fertility. this condition is associated with the ability