Abstract
Summary
A marked difference in the sensitivity of three different strains of rats to the synergistic action of certain gonadotropic hormones has been shown. The three strains, Sprague-Dawley, Wistar and Sherman, give comparable responses to the gonadotropins of pituitary, pregnant mare serum and pregnancy urine when administered singly. Only the Sprague-Dawley and Wistar strains show any augmentative response when purified pituitary follicle-stimulating hormone is given in combination with either chorionic gonadotropin (prolan) or pregnant mare serum hormone.
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