پاسخ جمعیت میکروبی دستگاه گوارش و عملکرد جوجه‌های گوشتی تغذیه شده با اسیدهای آلی و نانو نقره پوشش داده شده بر زئولیت تحت تنش گرمایی
Subject Areas : Camelا. عباسی 1 , س.ر. هاشمی 2 , س. حسنی 3 , م. ابراهیمی 4
1 - Department of Animal Science, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran
2 - Department of Animal Science, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran
3 - Department of Animal Science, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran
4 - Department of Food Industry, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran
Keywords: عملکرد, تنش گرمایی, دستگاه گوارش, اسید آلی, نانو ذرات نقره,
Abstract :
هدف از این آزمایش ارزیابی پاسخ جمعیت میکروبی دستگاه گوارش و عملکرد جوجه‌های گوشتی تغذیه شده با اسیدهای آلی و نانو نقره پوشش داده شده بر زئولیت تحت تنش گرمایی می‌باشد. به همین منظور در این آزمایش از 375 قطعه جوجه گوشتی یکروزه نژاد کاب (500 Cobb) استفاده شد. که در 5 تیمار و 5 تکرار و 15 قطعه جوجه در هر تکرار در قالب یک طرح کاملاً تصادفی تقسیم شدند. پنج تیمار غذایی شامل: 1) جیره شاهد، 2) جیره شاهد حاوی 1 درصد زئولیت، 3) جیره شاهد حاوی 1 درصد زئولیت پوشش داده شده با 0.5 درصد نانو نقره، 4) جیره شاهد حاوی 1 گرم بر کیلوگرم اسید آلی و 5) جیره شاهد حاوی 1 درصد زئولیت پوشش داده شده با 0.5 درصد نانو نقره و 1 گرم بر کیلوگرم اسید آلی بود. خوراک مصرفی و وزن بدن برای هر تیمار در کل دوره آزمایش ثبت و ضریب تبدیل خوراک محاسبه گردید. به منظور شمارش جمعیت میکروبی دستگاه گوارش دو قطعه جوجه از هر واحد آزمایشی در روزهای 21 و 42 پرورش کشتار شدند. نتایج آزمایش نشان داد که جیره غذایی حاوی نانو نقره به همراه اسید آلی باعث کاهش وزن بدن جوجه‌های گوشتی در مقایسه با تیمار شاهد و زئولیت در فاصله سن 42-21 روزگی شد (P<0.05). همچنین در کل دوره پرورش ضریب تبدیل غذایی در گروه نانو نقره پوشش داده شده بر زئولیت به طور معنی داری نسبت به گروه شاهد و زئولیت بالاتر بود (P<0.05). با این حال تیمارهای آزمایشی هیچگونه اختلاف معنی‌داری بر جمعیت میکروبی دستگاه گوارش نداشتند (0.05<P). به طور خلاصه نتایج حاضر نشان داد اگرچه نانو ذرات نقره و اسیدهای آلی اثر خاصی بر پارامترهای عملکرد و افزایش شمار باکتری‌های مفید (اسید لاکتیک) دستگاه گوارش در حالت تنش گرمایی نداشتند اما موجب کاهش آنها نگشتهاند. بنابراین می‌توان از آنها به عنوان افزودنی در جیره غذایی جوجه‌های گوشتی استفاده نمود.
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