That one or another principle contained in the anterior lobe of the hypophysis is the specific
stimulus of the developed mammary gland (rabbit, bitch, hog, cow) to active milk secretion …

We have previously shown that a distinct anterior pituitary hormone, prolactin, initiates
lactation in fully developed mammary glands, induces the growth and functioning of the crop-…

1. Fault-bars, or feather defects presenting five rather distinct types, have been found and
described. 2. The fault-bars occur "normally" in all bird groups, in all plumages, in all feather …

Riddle and Braucher 1 showed that the effective stimulus for the enlargement and functioning
(formation of “crop-milk”) of the crop-glands of pigeons is a substance derivable from the …

In virgin rats aged 67-81 days, with ovaries stimulated by Prolan or FSH administration during
5 days, the injection of purified and previously heated prolactin induced maternal behavior …

Other studies of this laboratory (1, 2) have shown that the testes of mature ring doves undergo
rapid involution to less than one-tenth their former size during 10 to 12 days under heavy …

456 OSCAR RIDDLE withstanding this great amount of study and description, the literature
fails to give satisfactory answer to any of the following questions:(1) Precisely how and where …

It is an odd fact that, although the bird embryo has long been an object of special biological
interest as well as of much commercial importance, only a single study has hitherto been …

The question" Is it a boy or a girl?" is perhaps the first which is generally asked about the
majority of mankind during the earliest hours of their independent existence; and the query" Will …

A procedure for extraction and proximate purification of prolactin is fully described. The tissue
is first extracted with 60 to 70 per cent aqueous ethanol at pH 9 to 10, and this followed by …