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- W2079339724 abstract "Five distinct forms of gonadotropin-releasing hormone (GnRH) and their analogs, six of which are newly designed, were used to study reproduction in Thai catfish, Clarias macrocephalus. Determination was made for the percentage of fish that ovulated within 16–18 h; the percentage of eggs fertilized; and the percentage of larva that hatched and survived for 7 days. The results show, firstly, that natural chicken GnRH-II, which is identical with catfish GnRH-II, was significantly more effective at a dose of 300 μg/kg than the control injection for the induction of ovulation. Dogfish GnRH at the same dose was also significantly more effective than the control, but was not significantly different from chicken (catfish) GnRH-II for ovulation induction. The novel catfish GnRH-I, mammalian GnRH and salmon GnRH were not effective at 100, 150 or 300 μg/kg in Thai catfish. Secondly, 5 of 8 analogs of GnRH at a dose of 20 μg/kg resulted in a significantly higher percentage of ovulating fish compared with the control fish. Among these five analogs, the most effective were the two analog forms of chicken GnRH-II (d-Arg6,Pro9 NEt and d-Nal6,Pro9 NEt), followed by the salmon GnRH analog (d-Arg6,Pro9 NEt), a dogfish GnRH analog (d-Arg6,Pro9 NEt) and the mammalian GnRH analog (d-Ala6,Pro9 NEt). Not significantly different from the controls were the two catfish GnRH-I analogs and one of the dogfish (d-Nal6,Pro9 NEt) analogs. The six new analogs had not been previously tested in any animal. Thirdly, the number of fish ovulating was the same whether GnRH was administered in one or two injections." @default.
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- W2079339724 date "1992-11-01" @default.
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- W2079339724 title "Structure-function studies of five natural, including catfish and dogfish, gonadotropin-releasing hormones and eight analogs on reproduction in Thai catfish (Clarias macrocephalus)" @default.
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- W2079339724 doi "https://doi.org/10.1016/0167-0115(92)90024-o" @default.
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