The behavior of chickens following embryonic treatment with testosterone propionate

This study was designed to investigate an initial response and the flocking behavior of chicks treated embryonically with testosterone propionate (TP). The high (1.28 gm. %) and low (0.32 gm. %) levels of TP interfered with the response of these chicks to a specific stimulus. However, only the high level TP depressed the flocking response. TP administered prior to day 13 of embryonic development will depress sexual behavior in the chicken. These data suggest that TP influences a variety of behavioral patterns in the chicken.