[Postnatal changes in the content of neurohypophyseal enzymes in the Brattleboro rat]

The development of the neurohypophysial content of vasopressin and oxytocin in the Brattleboro rats is investigated. During the early development stages, no alteration of the oxytocin content could be observed owing to the reduced synthesis of vasopressin in the heterozygous rats (Di/+) or to the lack of this hormone in the homozygous rats (Di/Di).