Indiziert in
- Online-Zugriff auf Forschung in der Umwelt (OARE)
- Öffnen Sie das J-Tor
- Genamics JournalSeek
- JournalTOCs
- Scimago
- Ulrichs Zeitschriftenverzeichnis
- Zugang zu globaler Online-Forschung in der Landwirtschaft (AGORA)
- Elektronische Zeitschriftenbibliothek
- Zentrum für Landwirtschaft und Biowissenschaften International (CABI)
- RefSeek
- Verzeichnis der Indexierung von Forschungszeitschriften (DRJI)
- Hamdard-Universität
- EBSCO AZ
- OCLC – WorldCat
- Gelehrtersteer
- SWB Online-Katalog
- Virtuelle Bibliothek für Biologie (vifabio)
- Publons
- MIAR
- Kommission für Universitätsstipendien
- Euro-Pub
- Google Scholar
Nützliche Links
Teile diese Seite
Zeitschriftenflyer
Open-Access-Zeitschriften
- Allgemeine Wissenschaft
- Biochemie
- Bioinformatik und Systembiologie
- Chemie
- Genetik und Molekularbiologie
- Immunologie und Mikrobiologie
- Klinische Wissenschaften
- Krankenpflege und Gesundheitsfürsorge
- Landwirtschaft und Aquakultur
- Lebensmittel & Ernährung
- Maschinenbau
- Materialwissenschaften
- Medizinische Wissenschaften
- Neurowissenschaften und Psychologie
- Pharmazeutische Wissenschaften
- Umweltwissenschaften
- Veterinärwissenschaften
- Wirtschaft & Management
Abstrakt
Growth, Reproduction and Sex Ratios in Oreochromis Andersonii (Castelnau, 1861) Fed with Varying Levels of 17α-Methyl Testosterone
Kefi AS *,Kang’ombe J ,Kassam D ,Katongo C
Three different doses (40, 60 and 90 mgMT/kg feed) of 17α-methyl testosterone (MT) were administered to Oreochromis andersonii. Growth, reproduction and sex ratios were evaluated. The fish raised on 60 mgMT/kg feed had the highest final mean weight and this was significantly different (P<0.05) from other hormone doses. Additionally, the 60 mgMT/kg fed fish had the lowest fecundity and reproductive effort. Histological examination of the gonads did not show any differences between the control and MT fed fish. The gross margin ratio (GMR) of the control group was the highest (P<0.05). The proportion of males in MT treated groups deviated significantly from the control group although the percentage of males obtained from the 40 mgMT/kg feed (93.4%) and 60 mgMT/kg feed (94.4%) fish was insignificant (P>0.05). Furthermore, the highest dose used produced a significantly lower (P<0.05) male proportion (79.3%) than the other treatments. The anabolic effect of androgen MT diminished over time.