The gonadotrophic activities of crude glycoprotein fractions from pituitaries of man, sheep, chicken and carp and of partially purified follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the three tetrapod species were examined in both sexes of the lizard Anolis carolinensis. The piscine material did not show activity in the lizard but all mammalian and avian preparations promoted spermatogenesis, ovarian growth, ovulation and steroidogenesis. FSH preparations were far more potent than LH, in fact the actions of the LH preparations may have been due largely to FSH contamination. These findings are consistent with earlier conclusions that FSH alone may be able to stimulate all types of gonadal activity in lizards, except that high doses of FSH block ovulation. Comparisons of the relative potencies of the avian and mammalian preparations provide evidence for the zoological specificity of vertebrate gonadotrophins. In general, the relative potency of chicken gonadotrophins in lizards was greater than that estimated from standard rodent bioassays: i.e. the lizard is relatively more sensitive to chicken gonadotrophin than the rodent.
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