ارزیابی نتایج حاصل از کشتار بره ها در تلاقی میش های ورامینی با قوچهای شال، افشاری، مغانی و ورامینی

نوع مقاله : علمی پژوهشی- ژنتیک و اصلاح دام و طیور

نویسندگان

1 دانشگاه محقق اردبیلی

2 دانشگاه زنجان

چکیده

هدف از انجام این تحقیق ارزیابی نتاج حاصل از کشتار بره ها در آمیزش یک طرفه میش‌های ورامینی باقوچهای شال، افشاری، مغانی و ورامینی جهت بررسی و مقایسه عملکرد نتاج آنها می باشد.نتایج داده‌های مربوط به بازده لاشه نشان داد که بره‌های آمیخته افشاری از بازده لاشه بهتری نسبت به سایر گروههای نژادی برخوردار بودند با وجود اینکه وزن زنده قبل از کشتار بره های آمیخته شال ومغانی بیشتر بود. بره‌های نر نسبت به بره های ماده از وزن زنده قبل از کشتار و بازده لاشه بهتر و بالاتری برخوردار بودند.نتایج تجزیه داده های مربوط به درصد قطعات لاشه حاکی از آن بود که بره های حاصل از تلاقی قوچهای افشاری با میش‌های ورامینی برای درصد مجموع قطعات پرارزش ران، راسته ، سردست ، درصد مجموع قطعات کم‌ارزش قلوه‌گاه، سرسینه و گردن دارای بیشترین عملکرد و نسبت به سایر گروههای ژنتیکی دارای کمترین درصد دنبه بودند.نتایج ترکیب نسبتهای بافتی لاشه نشان داد که بره های آمیخته افشاری، مغانی و شال درصد گوشت بیشتری را نسبت به نژاد ورامینی خالص داشته و نژاد ورامینی درصد چربی بیشتری را در ناحیه دنده‌های 10-11-12 دارا بود. با توجه به نتایج داده‌های سطح مقطع لاشه و طول لاشه بیشترین سطح مقطع لاشه و طول مربوط به بره های آمیخته شال و افشاری بود اگرچه این تفاوت بین نژادها معنی‌دار نبود.جنس نر در مقایسه با جنس ماده از سطح مقطع لاشه بالائی برخوردار بوده و این تفاوت معنی دار بود.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Slaughtered lambs Results from Varamini Ewes Crossing with Shal, Afshar, Moghani and Varamini Rams

نویسندگان [English]

  • reza seyedsharifi 1
  • Akbar hamze zadeh azar 2
1 University of Mohaghegh Ardabili
2 University of Zanjan
چکیده [English]

Introduction One of the animal breeding aims is increasing the economic efficiency. Therefore, mating among selected animals in order to enhance economic efficiency should also supply variation in population for next generations’ selection. This study was performed to estimate performance in cross breed lambs resulting from crosses of shal, moghani, afshari and varamini rams with varamini ewes, compained it to pure varamini lambs.
Materials and Methods The objective of this study was the progeny evaluation from slaughter in one way crossing between Varamini ewes with Shal, Afshari, Moghani and Varamini rams and comparing their progeny efficiency. Thus, three 1.5 and 3 years rams were selected from each of Shal, Afshari, Moghani and Varamini breeds. A sample was separated from 10, 11 and 12 ribs was separated for examination of the fat, meat and bone percentage in different breed group lambs carcass. Data statistical analyze was done by GLM procedure of SAS 9.1 software.
Results and Discussion Afshari crossbreed lambs had better carcass performance rather than the other breed groups although before slaughtering live weight of Shal and Moghani lambs were higher. Male lambs had better live weight and carcass quality before slaughtering than female lambs. The analyze of carcass parts percentage indicated that crossbreed lambs from Afshari rams with Varamini ewes had the highest efficiency and lowest rump percentage between genetic groups about valuable parts total percentage of thigh, roast, wristband and low price flank steak, brisket and neck. The analyze results of carcass tissue proportions combination showed Shal, Moghani and Afshar crossbreeds had more meat percentage and lower fat percentage on numbers 10, 11 and 12 of ribs than Varamini net breed.
Conclusion According to our findings about cross surface and length from carcass the highest amount of them was belong to Shal and Afshari breeds, although difference amount between breeds was not significant. Finally, male had more significantly cross surface than female. Average percentage for lion, thigh, flank, brisket, neck, longissmus muscle area and carcass length, full and empty digestive system in different genetic group has no significant difference, also, average for, shoulder, legs, tail, heat, lean percentage and bone in 10-12 vibs sample and skin and fat percentage in this sample was significantly different in various groups. Sex effect on total removable fat and percentage of various carcass sections expect of thigh, lion and neck percentages, other carcass sections have significant differences in two finishing periods.

کلیدواژه‌ها [English]

  • Carcass
  • cross breeding
  • Performance
  • Sheep
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