مقایسه صفات رشد و لاشه بره‌های لری‌بختیاری و آمیخته‌های رومانف و پاکستانی با لری‌بختیاری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، بخش تحقیقات علوم دامی مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان چهارمحال و بختیاری، ‏سازمان تحقیقات، آموزش و ترویج کشاورزی، شهرکرد، ایران

2 مربی، بخش تحقیقات علوم دامی مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان چهارمحال و بختیاری، سازمان ‏تحقیقات، آموزش و ترویج کشاورزی، شهرکرد، ایران

چکیده

در این پژوهش از اطلاعات صفات رشد بره‌های حاصل از گروه­های لری‌بختیاری (L)، آمیخته‌های رومانف× لری‌بختیاری (F1RL)،‌پاکستانی× لری‌بختیاری (F1PL)، (پاکستانی× لری‌بختیاری)× (رومانف× لری‌بختیاری) (¼P¼R½L) و (رومانف× لری‌بختیاری)× (رومانف× لری‌بختیاری) (F2RL) و صفات لاشه 50 رأس بره­ لری‌بختیاری و 41 رأس آمیخته‌های‌­ F1RL و 20 رأس آمیخته‌­های  F2RL به منظور بررسی عملکرد در صفات رشد و ترکیب لاشه استفاده شد. بره‌ها در سن 5 ±90 روزگی از شیر گرفته و در سن شش ماهگی کشتار شدند. وزن تولد بره‌هایلری‌بختیاری (12/5 کیلوگرم) به­طور معنی­داری (05/0P<) بیشتر از بره‌های آمیخته‌ رومانف و پاکستانی با لری‌بختیاری‌ (به‌ترتیب 81/4 و 57/4 کیلوگرم) بود. بره‌های آمیخته F1RL به‌طور معنی­داری (05/0P<) وزن شیرگیری و وزن شش ماهگی (به‌ترتیب 96/30 و 75/42 کیلوگرم) بیشتری نسبت به بره‌های لری‌بختیاری (به‌ترتیب 81/28 و 69/41 کیلوگرم) و سایر ترکیب­های نژادی داشتند. آمیخته­های F1RL و F2RL  نسبت به بره‌های لری­بختیاری به‌طور معنی‌داری (05/0P<) درصد گوشت لاشه بیشتری در سن ثابت (به‌ترتیب 57/59، 99/60 و 03/50) و وزن ثابت (به‌ترتیب 99/60، 24/59 و 56/49) داشتند. میانگین وزن و درصد کل چربی لاشه در بره­های لری­بختیاری نسبت به بره‌های F1RL و F2RL به‌طور معنی‌داری (05/0P<) (به‌ترتیب 56/7، 25/4 و 95/2 کیلوگرم و 57/31، 91/20 و 97/17 درصد در سن ثابت و به‌ترتیب 65/6، 30/4 و 12/5 کیلوگرم و 46/30، 08/20 و 46/22 درصد در وزن ثابت) بیشتر بود. بنابراین می­توان نتیجه گرفت که با آمیخته‌گری رومانف× لری­بختیاری (F1RL)، وزن شیرگیری و شش ماهگی و ترکیب لاشه بهبود یافته است.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of growth and carcass traits of Lori-Bakhtiari lambs and their crosses ‎with Romanov and Pakistani breeds

نویسندگان [English]

  • Mohammad Ali Talebi 1
  • Mohsen Bagheri 2
1 Associate Professor, Animal Science Research Department, Chaharmahal and Bakhtiari Agricultural and Natural ‎Resources Research Center, AREEO, Shahrekord, Iran
2 Instructor, Animal Science Research Department, Chaharmahal and Bakhtiari Agricultural and Natural Resources Research ‎Center, AREEO, Shahrekord, Iran
چکیده [English]

This study was conducted to investigate the performance of growth and carcass traits of Lori-Bakhtiari (L), Romanov×Lori-Bakhtiari (F1RL), Pakistani×Lori-Bakhtiari (F1PL), (Pakistani×Lori-Bakhtiari)×(Romanov×Lori-Bakhtiari) (¼P¼R½L) and (Romanov×Lori-Bakhtiari)×(Romanov×Lori-Bakhtiari) (F2RL) crossbred lambs. Carcass characteristics of Lori-Bakhtiari (n=50), F1RL (n=41) and F2RL (n=20) crossbred lambs. Lambs were weaned at the age of 90 ± 5 days. Lambs were slaughtered at six month of age. Birth weight in Lori-Bakhtiari (5.12 kg) was significantly (P<0.05) higher than in Romanov (4.81 kg) and Pakistani (4.57 kg) crossbred. Weaning weight and body weight in six months were significantly higher (P<0.05) in Romanov × Lori-Bakhtiari crossbred lambs (30.96 and 42.75, respectively) than in Lori-Bakhtiari (28.81 and 41.69, respectively) and others genetic compositions. F1RL and F2RL crossbred lambs for lean percentage were significantly (P<0.05) higher than in Lori-Bakhtiari lambs in constant age (59.57, 60.57 and 50.03, repectively) and in constant weight (60.99, 59.24 and 49.56, repectively). Weight and percentage of total fat of carcass in Lori-Bakhtiari lambs (7.56 kg, 31.57% in constant age 6.65 kg, 30.46% in constant weight, repectively) were significantly (P<0.05) higher than of F1RL (4.25 kg, 20.91% and 4.30 kg, 20.08%, repectively) and F2RL (2.95 kg, 17.97% and 5.12 kg, 22.46%, repectively) lambs. In conclusion, crossbreeding between Romanov and Lori-Bakhtiari (F1) improves body weight at weaning and at six months of age, and carcass composition.

کلیدواژه‌ها [English]

  • Carcass
  • crossbreeding
  • growth
  • Lori-Bakhtiari
  • Pakistani
  • Romanov‎

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علوم دامی ایران
دوره 50، شماره 4
اسفند 1398
صفحه 283-294

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سابقه مقاله

  • تاریخ دریافت: 17 شهریور 1398
  • تاریخ بازنگری: 16 آذر 1398
  • تاریخ پذیرش: 08 دی 1398

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