الفهرس 
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Abstract
ABSTRACT
The experimental work was conducted as an attempt to introduce; functional pituitary and gonad glands genes through its fragmented purified DNA, from: i. common carp. Cyprillt1s carpio and ii. African catfish, Clarias gariepinus, (males and females) into germ cells of Tilapia zillii (males and females). The evaluation ’was made on the progeny produced (F1) for 12 months post-hatching for growth performance, carcass traits. hematological and biochemical parameters, feed utilization, the histological changes, polymerase chain reaction (PCR) analysis followed with the agarose gel electrophoresis of DNA, and sexual maturity. Moreover, the second generation (F2) was produced and evaluated [or growth performance from hatch to three months age. The results were summarized in the following points: 1- Broodstocks of T zillii treated with different levels and sources of gonad DNA did not spawned at all. 2- Insignificant differences in T. zillii hatch weight of the first generation among the different DNA treatments were obtained. 3- Growth performance of the first generation of T zillii during the rearing period (12 months) indicated that the treatment with either catfish or carp pituitaries DNA stimulated their growth traits, but the lowest doses of DNA (I 00 ug) were more eflective than those of the highest (200 ug) of DNA in this respect. 4- The mean of the two lowest doses of DNA had superiority of body weight at 12 months age by about; 133.75 and 183.87 % over the mean of the two highest doses of DNA and nontransgenic control groups, respectively. 5- The mean of two lowest doses of DNA had superiority of total gain during the rearing period from. hatch to 12 months age by about; 135.70 and 173.66 % over the mean of two highest doses of DNA and nontransgenic control groups, respectively. 6- The mean of two lowest doses of DNA had superiority of ADO during the rearing period nom hatch to 12 months age by about; 137.50 and 137.50 % over the mean of two highest doses of DNA and nontransgenic control groups, respectively. 7- The mean of two lowest doses of ON A had superiority of SGR % / day during the rearing period from hatch to 12 months age by about; 9.36 and 11.66 % over the mean of two highest doses of ON A and nontransgenic control groups, respectively. 8- The mean of two lowest doses of DNA had superiority of condition factor at 12 months post-hatching by about; 13.45 and 20.81 % over the mean of two highest doses of DNA and nontrallsgcnic control groups, respectively. 9- Categories growth performance showed that, the transgenic groups treated with foreign DNA had the same model weight as control, but, in addition, contained many larger individuals that clearly lay outside the normal distribution. Moreover, the largest transgenic fish was 8.85 times than that of the average of nontransgcnic control groups. 10- The mean of transgenic group had improvement for dry matter, crude protein and crude fat of T.