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PITUITARY CONTENT OF FOLLICLE-STIMULATING HORMONE IN IMMATURE MALE RATS

Data on the pituitary content of follicle-stimulating hormone (FSH) in immature female rats have been published (Kragt & Ganong, 1968; Goldman & Mahesh, 1968; Fawke & Brown, 1970), but there seems to be little comparable information about the male. The following results have been obtained in males from our colony of Porton rats: the experiments were under conditions similar to those used in a previous investigation of the females (Fawke & Brown, 1970).

Three series of measurements were made (see Table 1). Results are strictly comparable within each series as they were obtained from animals born on the same day. In Series B and C, rats were randomized individually; in Series A, which involved unweaned rats, whole litters were killed together and only the allocation of litters was random. The animals