Abstract
Pituitary gonadotropic hormone function in lower vertebrates is under stimulatory control by the brain (Ball, 1981). Gonadal regression results from the isolation or the removal of specific neurosecretory brain centres in reptiles, amphibians and fish. Extracts of both fish and sheep hypothalamus increase gonadotropin release from mature carp pituitaries incubated in vitro (Breton et al., 1972). Injections of synthetic LHRH into carp and trout increase circulating gonadotropin levels (Breton and Weil, 1973; Crim and Cluett, 1974). The high doses of LHRH required to elicit gonadotropin release from the fish pituitary lead to speculation that the structures of mammalian and fish LHRH are different.
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Crim, L.W. (1984). Actions of LHRH and its analogs in lower vertebrates. In: Vickery, B.H., Nestor, J.J., Hafez, E.S.E. (eds) LHRH and Its Analogs. Advances in Reproductive Health Care, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5588-2_29
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DOI: https://doi.org/10.1007/978-94-009-5588-2_29
Publisher Name: Springer, Dordrecht
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