インデックス付き
- 環境研究へのオンライン アクセス (OARE)
- Jゲートを開く
- Genamics JournalSeek
- ジャーナル目次
- シマゴ
- ウルリッヒの定期刊行物ディレクトリ
- Global Online Research in Agriculture (AGORA) へのアクセス
- 電子ジャーナルライブラリ
- 国際農業生物科学センター (CABI)
- レフシーク
- 研究ジャーナル索引作成ディレクトリ (DRJI)
- ハムダード大学
- エブスコ アリゾナ州
- OCLC-WorldCat
- 学者の舵取り
- SWBオンラインカタログ
- 仮想生物学図書館 (vifabio)
- パブロン
- ミアル
- 大学補助金委員会
- ユーロパブ
- Google スカラー
このページをシェアする
ジャーナルチラシ
概要
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.