نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری تخصصی تغذیه دام، گروه علوم دامی، دانشکده علوم و مهندسی کشاورزی، دانشگاه رازی، کرمانشاه

2 دانشیار و عضو هیئت علمی گروه علوم دامی، دانشکده علوم و مهندسی کشاورزی، دانشگاه رازی، کرمانشاه

3 استادیار موسسه تحقیقات علوم دامی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران.

چکیده

این آزمایش به منظور بررسی تأثیر لیزوفسفولیپید و ویتامین C بر عملکرد، خصوصیات لاشه و پاسخ ایمنی جوجه‌های گوشتی تحت شرایط تنش گرمایی و دمای عادی انجام شد. تعداد 1680 قطعه جوجه گوشتی مخلوط (کاب 500) در دوره پایانی (38-21 روزگی) به دو گروه تقسیم شدند و در گروه اول 480 قطعه جوجه در چهار تیمار و چهار تکرار (30= n) در دمای عادی (1± 24 درجه سلسیوس) پرورش یافتند و در گروه دوم 1200 قطعه جوجه در چهار تیمار و 10 تکرار (30= n) در دمای بالا (1± 34 درجه سلسیوس به مدت 8 ساعت در روز) قرار گرفتند. در هر دو گروه چهار جیره بر اساس آزمایش فاکتوریل 2×2 شامل لیزوفسفولیپید (صفر یا 1000 میلی‌گرم در کیلوگرم) و ویتامین C (صفر یا 500 میلی‌گرم در کیلوگرم) تنظیم شد. در هردو گروه استفاده از لیزوفسفولیپید موجب افزایش ضریب تبدیل خوراک و کاهش افزایش وزن شد (سطح احتمال05/0). در گروه تنش گرمایی، افزایش قابلیت زنده مانی، تیتر آنتی‌بادی علیه برونشیت، وزن نسبی بورس و تیموس در جوجه های تغذیه شده با لیزوفسفولیپید و افزایش وزن نسبی تیموس و طحال در جوجه‌های تغذیه شده با ویتامین C در مقایسه با گروه شاهد مشاهده شد(سطح احتمال05/0) . در پرندگان تغذیه شده با لیزوفسفولیپید در شرایط عادی، افزایش معنی-دار طول نسبی ژئوژنوم دیده شد(سطح احتمال05/0). اثر متقابل معنی‌داری بین لیزوفسفولیپید و ویتامین C بر پاسخ به فیتوهماگلوتنین A مشاهده شد. به‌طور‌کلی بر اساس نتایج بدست آمده در این بررسی، استفاده از لیزوفسفولیپید و ویتامین C موجب بهبود پاسخ سیستم ایمنی جوجه‌های گوشتی ‌شد.

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