[Effect of arginine vasotocin, oxytocin and their fragments on the corticosterone content in the blood plasma of chickens of different ages].

Administration of arginin-vasotocin, oxytocin and their fragments had no effect on corticosterone content in the blood plasma of 10-month chickens whereas in 20 and 30-day chickens arginin-vasotocin and its terminal fragment: amid of prolyl-arginil-glycil, considerably increased the corticosterone content. The cyclic fragment of these hormones: tocinic acid, proved ineffective. The adrenocorticotropic effect of arginin-vasotocin obvious in young chickens seems to be due to the terminal part of the molecule.