Response to Selection for Body Weight in Japanese Quail (Coturnix coturnix japonica)
محورهای موضوعی : Camelاس. هوسن 1 , آ.م. عبد الرحمان ال-خدری 2 , آ.م. حسن 3
1 - Deprtment of Animal Production, College of Agriculture, University of Duhok, Kurdistan, Iraq
2 - Deprtment of Animal Production, College of Agriculture, University of Duhok, Kurdistan, Iraq
3 - Deprtment of Animal Production, College of Agriculture, University of Duhok, Kurdistan, Iraq
کلید واژه: body weight, Japanese quail, genetic parameters, predicted equation, selection response,
چکیده مقاله :
The present studyinvestigated the impact of selection for body weight (BW) on productive performance, predicted BW and genetic improvement of related traits in Japanese quail. Base population, selected parent and F1 progeny were tested. Pens and cages were used for rearing and breeding. A total of 240 birds in two successive generations, 27 sires and 54 dams (as selected parents) were used. Body weight from multiple regression equation, covariance analysis and combining models were estimated, response to selection, realized heritability and genetic correlation were computed for BW, weight gain (WG), feed intake (FI) and feed conversion ratio (FCR). The results showed that the response to selection for BW, WG, FI and FCR were 11.48 g, 27.04 g, 37 g and -0.2, respectively. The estimated heritabilities for the same traits were 0.78, 0.67, 0.52 and 0.77, respectively. Predicted equation (DUHOK equation) for BW as dependent variable on the initial body weight and sex ratio was derived. The final response for the body weight was determined as 5.84 % of live BW.
مطالعه حاضر به بررسی اثر انتخاب برای وزن بدن (BW) بر عملکرد تولیدی، BW پیشبینی شده و بهبود ژنتیکی مرتبط با صفات در بلدرچین ژاپنی است. جمعیت پایه، والدین منتخب و فرزندان F1 مورد آزمون قرار گرفتند. پرورش در قفس و لانه صورت گرفت. از تعداد کل 240 پرنده در دو نسل متوالی، 27 نر و 54 ماده (به عنوان والدین منتخب) به کار گرفته شدند. وزن بدن از معادله رگرسیون چندگانه، آنالیز کوواریانس و مدلهای مرکب برآورد گردیده و پاسخ انتخاب، وراثتپذیری تحقق یافته و همبستگی ژنتیکی برای BW، افزایش وزن (WG)، مصرف خوراک (FI) و ضریب تبدیل خوراک (FCR) محاسبه شدند. نتایج نشان داد که پاسخ انتخاب برای BW، WG، FI و FCR به ترتیب برابر با 48/11 گرم، 04/27 گرم، 37 گرم و 2/0- بود. وراثتپذیریهای برآورد شده برای صفات فوق نیز به ترتیب برابر با 78/0، 67/0، 52/0 و 77/0 بود. معادله پیشبینی شده (معادله DUHOK) برای BW به عنوان متغیر وابسته به وزن بدن اولیه و نسبت جنس نیز به دست آورده شد. پاسخ نهایی برای وزن بدن به صورت 84/5 درصد BW زنده تعیین گردید.
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