Author/Authors :
El-Zaeem، S.Y نويسنده DNA Research Chair, Zoology Department, College of Sciences, P.O. Box 2455, King Saud University, Riyadh 11451, Saudi Arabia-Animal and Fish Production Department, Faculty of Agriculture, (Saba-Bacha), Alexandria University, Alexandria, Egypt , , Salam، G.M نويسنده Animal and Fish Production Department, Faculty of Agriculture, (Saba-Bacha), Alexandria University, Alexandria, Egypt ,
Abstract :
This study was conducted to produce a high percentage of genetically male tilapia through interspecific hybridization between Nile tilapia, Oreochromis niloticus and Blue tilapia, O. aureus and evaluate sex ratio, productive performance and heterosis of the progeny produced. The results revealed that sex ratios of the progenies of (? O. aureus x ? O. niloticus) and (? O. niloticus x ? O. aureus) were 4.28: 1.00 and 3.59: 1.00 and differ (P < 0.05; df =1) significantly from the expected sex ratios of 3.00: 1.00 and 1.00: 0.00, respectively. In addition, the productive performance traits of (? O. aureus x ? O. niloticus) had significant (P?0.05) superiority in most of these traits. Moreover, although both hybrids displayed a positive or best heterosis for daily gain, SGR%/day, FCR and PER, the hybrid of (? O. aureus x ? O. niloticus) showed the highest or best heterosis.
