abdo9111
04-12-2010, 02:24 AM
انتجت سلالات عديدة من اسماك البلطى المحسنة وراثيا GMT )genetically male tilapia)
حيث بدأت اول ظهور لها عام 1995
وظهرت بمعدل نمو أعلى بحوالى 30 % تقريبا عن البلطى النيلى العادى
ثم توالت ظهور تحسينات فى هذه السلالات لأنه كما تعلم
دائما الهجين ضعيف فى تحمله للأمراض و مناعته وغيرها من بعض المشكلات التى لابد من تجنبها
وبالعمل الدؤوب نصل لمرادنا
وكما ذكر فى المنتدى فى مواضيع سابقة وفى المشروع الأول للمنتدى فى انتاج بلطى وحيد الجنس اننا نأمل ظهور هذه السلالات فى مصر ولكن ينقصنا اماكنيات كثيرة وبذلك نخطو خطوات بحذر
نأمل ان نسمع قريبا عن سلالات مثل سلالالة العباسة او كفر الشيخ
وجدت لسيادتكم هذا الموضوع
The YY male technology is under constant development. The first GMT® (and the broodstock to produce them), developed in a pure strain of Nile tilapia (Oreochromis niloticus) from Egypt, was released in 1995. After the development of the first GMT®, research on crossbreeding identified a number of superior crossbred GMT® produced using the Egyptian YY males crossed to females from different pure strains. A longer term breeding programme was also initiated using combined selection to produce a female line giving GMT® with high percentages of males and faster growth rates. This GMT® was ready for release in early 2001. The following table summarises development and releases of improved GMT®.
Table 1. Key developments of GMT®
Basis of genetic improvement
Release no & date
Growth performance
Original GMT® (developed in the Egyptian strain)
Release 1.0 (1995)
30-35% faster growing than mixed sex tilapia of Philippine strains
Best crossbred GMT®
Release 2.1
(Philippines – 1999)
Release 2.2
(U.S.A. - 2000)
Rel. 2.1 15-25% faster growing than the “original” GMT® (Rel. 1) in the Philippines
GMT® from selected female line
Release 3 (2002)
7.5 – 17.5% faster growing than best crossbred GMT® (Rel. 2.1)
Red GMT®
Release 1 (2002)
Growth data not yet available.
GMT® from crossbred YY male x selected female Release 4 (2003?) Preliminary data indicates 5-15% advantage over Rel. 3. Still under development
Figure 3. Crossbred GMT® (Rel. 2.2- only available in North America at present) has excellent growth rates and is deep bodied with a small head.
http://www.fishgen.com/5GMT_%208.jpg
Figure 4. A YY male used in the breeding programme to produce GMT® in a red tilapia strain (available towards the end of 2001). This red strain is actually a uniform pink colour with occasional red tints. Black markings have been virtually eliminated by breeding.
http://www.fishgen.com/cropped_picture_of_Stirling_red_tilapia_YY_male.jp g
اتمنى ان يفيد القارئ
حيث بدأت اول ظهور لها عام 1995
وظهرت بمعدل نمو أعلى بحوالى 30 % تقريبا عن البلطى النيلى العادى
ثم توالت ظهور تحسينات فى هذه السلالات لأنه كما تعلم
دائما الهجين ضعيف فى تحمله للأمراض و مناعته وغيرها من بعض المشكلات التى لابد من تجنبها
وبالعمل الدؤوب نصل لمرادنا
وكما ذكر فى المنتدى فى مواضيع سابقة وفى المشروع الأول للمنتدى فى انتاج بلطى وحيد الجنس اننا نأمل ظهور هذه السلالات فى مصر ولكن ينقصنا اماكنيات كثيرة وبذلك نخطو خطوات بحذر
نأمل ان نسمع قريبا عن سلالات مثل سلالالة العباسة او كفر الشيخ
وجدت لسيادتكم هذا الموضوع
The YY male technology is under constant development. The first GMT® (and the broodstock to produce them), developed in a pure strain of Nile tilapia (Oreochromis niloticus) from Egypt, was released in 1995. After the development of the first GMT®, research on crossbreeding identified a number of superior crossbred GMT® produced using the Egyptian YY males crossed to females from different pure strains. A longer term breeding programme was also initiated using combined selection to produce a female line giving GMT® with high percentages of males and faster growth rates. This GMT® was ready for release in early 2001. The following table summarises development and releases of improved GMT®.
Table 1. Key developments of GMT®
Basis of genetic improvement
Release no & date
Growth performance
Original GMT® (developed in the Egyptian strain)
Release 1.0 (1995)
30-35% faster growing than mixed sex tilapia of Philippine strains
Best crossbred GMT®
Release 2.1
(Philippines – 1999)
Release 2.2
(U.S.A. - 2000)
Rel. 2.1 15-25% faster growing than the “original” GMT® (Rel. 1) in the Philippines
GMT® from selected female line
Release 3 (2002)
7.5 – 17.5% faster growing than best crossbred GMT® (Rel. 2.1)
Red GMT®
Release 1 (2002)
Growth data not yet available.
GMT® from crossbred YY male x selected female Release 4 (2003?) Preliminary data indicates 5-15% advantage over Rel. 3. Still under development
Figure 3. Crossbred GMT® (Rel. 2.2- only available in North America at present) has excellent growth rates and is deep bodied with a small head.
http://www.fishgen.com/5GMT_%208.jpg
Figure 4. A YY male used in the breeding programme to produce GMT® in a red tilapia strain (available towards the end of 2001). This red strain is actually a uniform pink colour with occasional red tints. Black markings have been virtually eliminated by breeding.
http://www.fishgen.com/cropped_picture_of_Stirling_red_tilapia_YY_male.jp g
اتمنى ان يفيد القارئ