Abstract
This experment was conducted at the Poultry Farm،Animal production Dept./College of Agriculture. University of Baghdad from 1-4-2014 to 12-5-2014. to investigate the potential effect of day old chicks weight produced from two broiler strains and their crossing Ross 308 , Arbor Acres and Ross 308 x Arbor Acres on productive performance . A total of 360 day all chicks were distributed randomly to 6 groups with 4 replicate pens )15 birds / pens). The experimental groups were: T1= Ar-medium; T2= Ar - Large ; T3= R-medium; T4= R -Large; T5= R - Arb-medium; T6= R - Ar-Large. Results showed that body weight, weekly average gain, feed conversion ratio, dressing percentage and relative breast weight in female were significantly (p<0.05) better in group T3 and T5 compared to heavy chicks . While there was no significant differences between sex or strain for breast relative weight and other cuts. It could be concluded from this study that chicks with medium weight gave better or equal live weight compared to heaver strain .however crossing between hybrids improved productive performance of broilers .
Highlights
جدول . 2تأثير الوزن المتوسط والثقيل لفروج المحم بعمر يوم واحد في معدل وزن الجسم الاسبوعي (غم) لسلالتي Ross
While there was no significant differences between sex or strain for breast relative weight and other cuts
)P0.05( ** الاحرف المختلفة ضمن العمود الواحذ تشير الي وجود فروق معنوية بين متوسطات المعاملات علي مستوى
Summary
جدول . 2تأثير الوزن المتوسط والثقيل لفروج المحم بعمر يوم واحد في معدل وزن الجسم الاسبوعي (غم) لسلالتي Ross. 2تأثير الوزن المتوسط والثقيل لفروج المحم بعمر يوم واحد في معدل وزن الجسم الاسبوعي (غم) لسلالتي Ross 3تأثيرالوزن المتوسط و الثقيل لفروج المحم بعمر يوم واحد في معدل الزيادة الوزنية (غم) لسلالتي Rossو Arbor الاسثىع 6 588.33±50.09ab 480.08±62.76b 611.66±41.62ab 498.53±11.57b 557.41±60.95ab 692.99±43.17a
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