Genetic Evaluation of Growth Traits of Black Bengal Goat

محورهای موضوعی : Camel

ام.ام. میا ¹ , ام.آ.ام.ی. خاندوکر ² , اس.اس. هوساین ³ , ام.او. فاروق ⁴ , دی.آر. نوتر ⁵ , M.N. Haque ⁶

1 - Department of Genetics and Animal Breeding, Sylhet Agricultural University, Sylhet, Bangladesh
2 - Department of Genetics and Animal Breeding, Bangladesh Agricultural University, Mymensingh, Bangladesh
3 - Department of Genetics and Animal Breeding, Bangladesh Agricultural University, Mymensingh, Bangladesh
4 - Department of Genetics and Animal Breeding, Bangladesh Agricultural University, Mymensingh, Bangladesh
5 - Department of Animal and Poultry Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 240610306, USA
6 - Department of Genetics and Animal Breeding, Sylhet Agricultural University, Sylhet, Bangladesh

تاریخ دریافت : 1391/04/11 تاریخ پذیرش : 1391/10/11 تاریخ انتشار : 1392/09/10

کلید واژه: growth, black bengal goat, fixed factors, genetic parameters,

چکیده مقاله :

Black Bengal goat is the heritage and one of the potential genetic resources of Bangladesh. Least-squares means for body weights at birth, 3, 6, 9 and 12 months of age were 1.09, 5.12, 8.02, 10.92 and 14.47 kg, respectively. Sex of the kid has significant (P<0.05) effect on body weights at 6, 9 and 12 months of age. Type of birth and parity of the dam has significant (P<0.01) effect on birth weight only, whereas season of birth affected (P<0.05) all the body weight traits. Heritability estimates for body weights at birth, 3, 6, 9 and 12 months of age were 0.45, 0.47, 0.45, 0.49 and 0.47, respectively. Genetic correlations between body weight traits ranged from 0.34 to 0.83, whereas phenotypic correlations ranged from 0.34 to 0.90. The high heritability estimates obtained for body weights indicated that mass selection would generate substantial selection responses at all stages of growth.

چکیده انگلیسی:

موضوع این مطالعه ارزیابی پارامترهای ژنتیکی و فنوتیپی برای بعضی از صفات تولید‌مثلی ماده بزهای سیاه بنگالی بود. پارامترهای ژنتیکی توسط رویه حداکثر درست‌نمایی باقی‌مانده‌ها با برازش یک مدل حیوانی بدون در نظر گرفتن ژنتیک مادری و یا اثرات محیطی دایمی برآورد شد. میانگین‌های حداقل مربعات تعداد بزغاله در زمان زایش، تعداد بزغاله در زمان از شیرگیری، وزن در زمان زایش، وزن در زمان از شیرگیری و طول دوره آبستنی به‌ترتیب 5/1، 29/1، 58/1، 37/6 کیلوگرم و 171 روز بود. اثر تعداد زایش بزهای ماده روی تعداد بزغاله‌های متولد ‌شده، تعداد بزغاله‌ها در زمان از شیرگیری، وزن در زمان زایش، و وزن در زمان از شیر‌گیری معنی‌دار بود. در مجموع، تعداد بزغاله در زمان زایش و زمان از شیرگیری و همچنین وزن بزغاله در زمان زایش و زمان از شیرگیری با افزایش تعداد زایش افزایش یافت. اثر فصل زایش روی تعداد بزغاله در زمان از شیرگیری و وزن بزغاله در زمان زایش و زمان از شیرگیری معنی‌دار بود. برآورد توارث‌پذیری برای تعداد بزغاله در زمان زایش، تعداد بزغاله در زمان از شیرگیری، وزن بزغاله در زمان زایش، وزن بزغاله در زمان از شیرگیری و طول دوره آبستنی به‌ترتیب 08/0، 13/0، 1/0، 0/0 و 18/0 بود. تخمین‌های پایین بدست‌آمده برای صفات تولید‌مثلی مشخص می‌نماید که انتخاب بر اساس عملکردهای فردی بزهای ماده ممکن است منجر به پیشرفت ژنتیکی آهسته شود.

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