UTILIZATION OF ANDROGEN FOR THE PRODUCTION OF MONOSEX MALES TILAPIA (Oreochromis niloticus) | ||||
| Journal of Animal and Poultry Production | ||||
| Article 7, Volume 25, Issue 8, August 2000, Page 4949-4956 PDF (594.62 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2000.259604 | ||||
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| Author | ||||
| M. A. El-Harairy, | ||||
| Department of Animal Production, Faculty of Agriculture, University of Mansoura, El-Mansoura, Egypt. | ||||
| Abstract | ||||
| The efficacy of androgen hormone in producing monosexed males in Nile tilapia fry and the response of growth and survival rates to hormone treatment were studied. The influence of the androgen treatment on the histological features of the resulting gonads was also evaluated. The synthetic aromatizable 17α-methyltestosterone (MT) was supplemented in diet to newly hatched tilapia fry(<6days) at a level of 500 mg/kg feed for 21 and 56 days treatment periods (G 1and G2),while the control group (G3) was fed untreated diet. About 82% males were produced in groups 1 and 2. Treatment with MT had no significant effect on growth performance. However, MT treatment resulted in lowering the fish survival rate in treated groups (17.5±0.85 and 24.0±0.85 % for G1and G2, respectively),than that in the control group(33±0.87%). At the high level of MT used over 21 or 56 days,there were negative structural changes in the gonads. | ||||
| Keywords | ||||
| Tilapia; androgen; monosex; growth; survival; histology | ||||
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