دوره 7، شماره 14 - ( پاییز و زمستان 1395 )
جلد 7 شماره 14 صفحات 67-75 |
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چکیده: (4660 مشاهده)
آزمایش به منظور بررسی اثر آنتیبیوتیک، اسید آلی، پروبیوتیک و پریبیوتیک بر عملکرد و ریختشناسی رودهی باریک جوجههای گوشتی نر سویه راس 308 به مدت 42 روز و در شرایط گرمسیری انجام شد. آزمایش در قالب طرح کاملاً تصادفی با 5 تیمار، 4 تکرار و 8 قطعه جوجه در هر تکرار انجام گردید. تیمارهای آزمایشی عبارت بودند از: T1: جیره پایه، T2: جیره حاوی آنتیبیوتیک اکسیتتراسایکلین (150گرم/تن خوراک)، T3: جیره حاوی اسید آلی اورگاسید (3 کیلوگرم/تن خوراک)، T4: جیره حاوی پروبیوتیک پروتکسین (150 گرم/تن خوراک) و :T5 جیره حاوی پریبیوتیک مانان الیگوساکارید (2 کیلوگرم/تن خوراک). نتایج نشان داد جیره‌های آزمایشی تأثیر معنیداری بر خوراک مصرفی، وزن زنده و ضریب تبدیل غذایی نداشتند. طول نسبی ژژنوم و ایلئوم به وسیله پریبیوتیک افزایش معنیداری داشت (05/0P<). اسیدیته قسمتهای مختلف رودهی باریک به طور معنی¬داری در اثر مصرف اسید آلی کاهش نشان داد (05/0P<). پروبیوتیک باعث افزایش معنیدار طول ویلی در دئودنوم و ژژنوم گردید (05/0P<). همچنین مصرف آنتیبیوتیک و پروبیوتیک باعث افزایش نسبت طول ویلی به عمق کریپت در قسمت ژژنوم رودهی باریک شد (05/0P<). ضخامت لایهی ماهیچهای در ژژنوم و ایلئوم در اثر مصرف اسید آلی و پروبیوتیک کاهش نشان داد (05/0P<). به طور کلی نتایج تحقیق حاضر نشاندهنده اثرات مثبت مکملهای مورد استفاده بر خصوصیات ریختشناسی روده باریک بود اما تفاوتی در عملکرد جوجههای گوشتی ایجاد ننمود.
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