تأثیر بوتیلیتد هیدروکسی آنیزول (BHA) و بوتیلیتید هیدروکسی تولوئن (BHT) بر فراسنجه‌های کیفی اسپرم قوچ پس از فرآیند انجماد و یخ گشایی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد فیزیولوژی دام، دانشگاه آزاد اسلامی، واحد کرج

2 دانشجوی دکتری فیزیولوژی دام، پردیس کشاورزی ومنابع طبیعی دانشگاه تهران، کرج

3 استادیار، گروه دامپزشکی، واحد ساوه،دانشگاه آزاد اسلامی، ساوه، ایران

4 استادیار، پردیس کشاورزی ومنابع طبیعی دانشگاه تهران، کرج

چکیده

هدف از انجام این پژوهش، بررسی تأثیر غلظت­های مختلف بوتیلیتد هیدروکسی تولوئن (BHT) و بوتیلیتد هیدروکسی آنیزول (BHA) بر فراسنجه­های کیفی اسپرم قوچ پس از فرآیند انجماد-یخ‌‌گشایی است. به این منظور، از چهار رأس قوچ بالغ و سالم نژاد سافولک (4–5/2 سال) به مدت سه هفته و هر هفته دو نوبت اسپرم­گیری شد. پس از ارزیابی اولیه، نمونه­های منی با هم مخلوط و بر پایۀ غلظت مورد نیاز به هشت قسمت تقسیم شدند. سپس نمونه­ها با تیمارهای آماده‌شده [شامل: شاهد منفی (بدون پاداکسنده یا آنتی­اکسیدان و حلال)، شاهد مثبت (بدون پاداکسنده با افزودن حلال) و سطوح 5/0، 1 و 2 میلی‌مول از پاداکسنده­های BHA و BHT، هرکدام در قالب یک تیمار)] رقیق‌ و به مدت 150 دقیقه در دمای 4 درجۀ سلسیوس به تعادل رسیده و به نی (پایوت)­های ویژه 25/0 میلی­لیتری کشیده شدند. پس از آن نی­ها منجمد و برای ذخیره­سازی به تانک نیتروژن منتقل شدند. پس از یخ­گشایی، فراسنجه­های کیفی اسپرم شامل جنبایی، زنده‌مانی و یکپارچگی غشای پلاسمایی ارزیابی شدند. نتایج به‌دست‌آمده از این آزمایش نشان می­دهد، افزودن 2 میلی­مول BHA به رقیق­کنندۀ اسپرم قوچ سبب بهبود جنبایی کل نسبت به گروه­های شاهد مثبت و منفی شده است (01/0>P). همچنین، تیمار 2 میلی­مول BHA سبب افزایش جنبایی پیش­رونده و یکپارچگی غشای اسپرم نسبت به دیگر گروه­ها شده است (05/0>P)، اما زنده‌مانی تیمارهای حاوی سطوح مختلف BHA و BHT تفاوت معنی­داری با گروه­های شاهد مثبت و منفی نداشت (05/0<P). بنابراین، نتیجه­گیری می­شود که افزودن 2 میلی­مول پاداکسندۀ BHA به رقیق­کننده، سبب بهبود فراسنجه­های پس از انجماد اسپرم قوچ می­ شود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Butylated Hydroxy Anisole (BHA) and Butylated Hydroxy Toluene (BHT) on semen quality of Ram semen after freeze thawing Process

نویسندگان [English]

  • Ahmad Akbari Kalesar 1
  • Afshin Seifi-Jamadi 2
  • Jafar Yadi 3
  • Hamid Kohram 4
1 Former M. Sc. Student in Animal Physiology, Islamic Azad University, Karaj Branch, Iran
2 Ph.D. Candidate in Animal Physiology, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
3 Assistant Professor, Department of Veterinary, Saveh Branch, Islamic Azad University, Saveh, Iran
4 Assistant Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

The aim of this study was to evaluate the effects of different concentration of Butylated hydroxy toluene (BHT) and Butylated hydroxyanisole (BHA) on freezing capacity of Rams semen. Semen of four healthy mature ram (2.5 - 4 years) was collected, twice a week for three weeks. Collected semen samples were pooled after primary evaluation and divided into 8 groups. Then samples were diluted with one of the treatments [ including negative control (without antioxidants and DMSO), positive control (without antioxidants, with DMSO), BHA-0.5 (containing 0.5 mM BHA), BHA-1 (containing 1 mM BHA), BHA-2 (containing 2 mM BHA), BHT-0.5 (containing 0.5 mM BHT), BHT-1 (containing 1 mM BHT) and BHT-2 (containing 2 mM BHT)] and were equilibrated at 4 ºC for 150 min. Afterward the cooled semen were loaded into 0.25 mL straws and were frozen in liquidnitrogen vapor. Motion characteristic (using CASA: Computer Assisted Sperm Analysis), viability and membrane integrity were assessed after thawing. The results of this study showed that addition of 2mM BHA to the extender could significantly increase total motility compared to the negative and positive control treatments (P>0.01).Also addition of 2 mM BHA significantly improved the progressive motility and membrane integrity compared to rest of the groups (P>0.05). However, different levels of BHA and BHT have not shown any significant difference in viability of ram sperm (P>0.05). So it is concluded that the addition of 2 mM BHA to the extender could improves the freezability of Ram semen.

کلیدواژه‌ها [English]

  • Freezabiliy
  • ram semen
  • intergrity
  • Membrane
  • motion
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