مطالعه تاثیر نسبت‌های مختلف علوفه به کنسانتره بر صفات عملکرد و لاشه بره‌های پرواری نژاد زل

نوع مقاله : مقاله کامل

نویسندگان

1 دانشگاه آزاد اسلامی، واحد قائم‌شهر، گروه علوم دامی

2 دانشگاه آزاد اسلامی، واحد قائم‌شهر، گروه علوم دامی، قائم‌شهر، ایران

چکیده

هدف از تحقیق حاضر تعیین موثرترین نسبت علوفه به کنسانتره بر صفات مصرف خوراک، وزن بدن، ضریب تبدیل خوراک و کیفیت و کمیت لاشه بره‌های نر پرواری زل بود. مطالعه حاضر با استفاده از 20 رأس بره نر نژاد زل با سن 16هفته با میانگین وزنی 8/27 کیلوگرم به مدت 90 روز در قالب طرح کاملا تصادفی با چهار تیمار و پنج تکرار انجام شد. تیمارهای آزمایشی شامل نسبت‌های متفاوت علوفه به کنسانتره به صورت 20:80 ، 30:70 ، 40:60 و 50:50 بود. داده‌های تحقیق با رویه LSmeans و رگرسیون  در نرم‌افزار SAS آنالیز شدند. اثر نسبت‌های مختلف علوفه به کنسانتره بر کلیه صفات عملکرد (01/0>P)، وزن کشتار (05/0>P)، افزایش وزن در دوره پروار (05/0>P)، افزایش وزن روزانه (05/0>P)، مصرف خوراک (01/0>P)، ضریب تبدیل خوراک (01/0>P)، وزن محتویات دستگاه گوارش (05/0>P)، وزن لاشه گرم و سرد (05/0>P)، درصد لاشه (05/0>P) و ضخامت چربی پشت معنی‌دار شد (05/0>P). تغییر در صفات مذکور با افزایش نسبت کنسانتره به علوفه به صورت خطی مشاهده شد (01/0>P). با افزایش درصد کنسانتره در خوراک، مصرف خوراک افزایش می‌یابد. به دلیل محتوای بیشتر انرژی و مواد مغذی کنسانتره نسبت به علوفه، بره‌هایی که کنسانتره بیشتری مصرف می‌کنند، وزن بدن و وزن کشتار بیشتری داشتند. بر اساس نتایج حاصل برای عملکرد مطلوب در بره‌های پرواری، جیره‌ای با نسبت علوفه به کنسانتره برابر (50:50) پیشنهاد می‌شود.
 

کلیدواژه‌ها


عنوان مقاله [English]

Study of different ratios effect of forage to concentrate on performance and carcass traits of Zel fattening lambs

نویسندگان [English]

  • S.M Mousavi Kashani 1
  • Sh Gharahveysi 2
  • K Jafari Khorshidi 1
1 Department of Animal Science, Qaemshahr branch, Islamic Azad University
2 Department of Animal Science, Qaemshahr branch, Islamic Azad University, Qaemshahr, Iran
چکیده [English]

The aim of this study was to determine the most effective ratio of forage to concentrate on feed intake, body weight, feed conversion ratio, and quality and quantity of carcasses of male Zel fattening lambs. The present study was performed using 20 male Zel lambs aged 16 weeks with an average weight of 27.8 kg for 90 days in a completely randomized design with four treatments and five repeats. Experimental treatments included different ratios of forage to concentrate at 20:80, 30:70, 40:60, and 50:50. The research data were analyzed by LSmeans procedure and regression in SAS software. Effect of different ratios of forage to concentrate on all yield traits (P <0.01), slaughter weight (P <0.05), weight gain during feeding period (P <0.05), daily weight gain (P <0.05), feed intake (P <0.01), feed conversion ratio (P <0.01), the weight of gastrointestinal contents (P <0.05), hot and cold carcass weight (P <0.05), carcass percentage (P <0.05) and thickness Backfat was significant (P <0.05). The change in the mentioned traits was observed linearly, increasing the concentration ratio to forage (P <0.01). As the percentage of concentrate in the feed increases feed intake increases. Due to the higher energy and nutrient content of concentrate than forage, lambs that consumed more concentrate had higher body weight and slaughter weight. Based on the results for optimal performance in fattening lambs, a ration with a ratio of forage to concentrate equal to (50:50) is recommended.

کلیدواژه‌ها [English]

  • fattening
  • forage
  • concentrate
  • carcass quality and Zel breed
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