Gastrointestinal Microbial Population Response and Performance of Broiler Chickens Fed with Organic Acids and Silver Nanoparticles Coated on Zeolite under Heat Stress Condition
محورهای موضوعی : 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
کلید واژه: performance, heat stress, organic acid, silver nanoparticle, gastrointestinal,
چکیده مقاله :
The aim of this study was to evaluate gastrointestinal microbial population response and performance of broiler chickens fed organic acids and silver nanoparticles coated on zeolite under heat stress condition. In this experiment, 375 one-day old broiler chicks (Cobb 500) were randomly divided into 5 treatments containing 5 replicates with 15 birds in each replicate. Five dietary treatments were compared: (1) basal diet (control), (2) basal diet containing 1% zeolite, (3) basal diet containing 1% of zeolite coated with 0.5% silver nanoparticles, (4) basal diet containing 1 g/kg organic acids and (5) basal diet containing 1% zeolite-coated with 0.5% silver nanoparticles and 1 g/kg organic acids. Feed intake and body weight were recorded in the course of the whole experiment for each treatment, and the feed conversion ratio were calculated subsequently. On days 21 and 42 of the experiment, one chicken in each replicate slaughtered to enumerate gastrointestinal microbial population. Theresultsof the experiment indicate that diet containing nanosilver with organic acid decreased broiler body weight comparedwith the control andzeolite treatment at 21-42days of age (P<0.05). Also feed conversion ratio was significantly higher in the nanosilver coated on zeolite group than in the control, zeolite and organic acids groups in the whole experimental period (P<0.05). However, there was no significant difference between the experimental treatments on the responses of gastrointestinal microbial population (P>0.05). In conclusion, the present results showed, although silver nanoparticles and organic acids did not have particular effect on performance parameters and increasing the number of useful intestinal microbial population (lactic acid), yet they did not have destructive effects on outcome either. Therefore, these additives can be used in broilers diet.
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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