Abstract
Neurohypophysial extracts from young male chickens and male and female turkeys were subjected to ion exchange chromatography on CMC columns. Fractions obtained by gradient elution were examined pharmacologically. Oxytocin and arginine vasotocin, the 2 previously described avian hormones, were consistently present. At no time could arginine vasopressin be demonstrated in these extracts. Possible reasons for the discrepancies between our findings and those of others are discussed. (Endocrinology75: 104, 1964)