Relative Bioavailability of Different Zinc Sources Based on Tissue Zinc Concentration in Broiler Chickens
محورهای موضوعی : CamelM. Sahraei 1 , H. Janmohammadi 2
1 - Department of Animal Science, Ardabil Research Center of Agriculture and Natural Resources, Ardabil, Iran
2 - Department of Animal Science, Faculty of Agriculture, Tabriz University, Tabriz, Iran
کلید واژه: broiler chicks, bioavailability, tibia, Zinc,
چکیده مقاله :
This research project was conducted to evaluate bioavailability and chemical properties of different zinc sources in broiler chickens when fed by practical diets. For that, 312 day-old male Ross 308 broiler chicks were fed from 8-28 day to estimate the biological availability of four zinc sources. Chicks were allocated randomly to 13 experimental diets in a 3 × 4 factorial design. Diets included an unsupplemented corn-soybean meal basal diet, or the basal diet supplemented with 100, 150 or 200 mg/kg of DM as either zinc sources. Supplementation of basal diets by different zinc levels and sources had no effects on feed intake and body weight gain of chicks during the first and the second weeks of experimental periods, but feed conversion ratio in the first and the second week, feed intake, body weight gain, feed conversion ratio in the third week and the total experimental periods were significant (P<0.05) affected by supplementary levels of zinc sources. Tibia and liver zinc content was increased linearly by adding different levels of zinc sources except zinc oxide A in the basal diet (P<0.05). The highest zinc concentration in the pancreas was observed only in the basal diet supplemented with 200 mg zinc oxide B per kg of diet in compare to basal diet (P<0.05). Using the slope ratio methods from the regression of zinc concentration in the tibia, liver and pancreas on zinc intake from different supplementary zinc levels showed that the highest relative bioavailability value based on tibia bone zinc concentration was estimated when used 150 mg different zinc sources in kg of basal diet, but relative bioavailability value was also estimated based on pancreas zinc content showing a linear increase by increasing different level of zinc sources. In conclusion Bioplex Zn in the same level was more bioavailabe than others.
این پروژه تحقیقاتی برای ارزیابی زیست‌فراهمی و خصوصیات شیمیایی منابع مختلف عنصر روی از قبیل سولفات روی، اکسید روی A، اکسید روی B و بیوپلکس روی در جوجه‌های گوشتی تغذیه شده با جیره‌های معمولی انجام گردید. برای این منظور از312 قطعه جوجه گوشتی جنس نر سویه راس 305، از سن 28-8 روزگی در قالب 13 جیره آزمایشی شامل جیره پایه بدون مکمل روی و جیرهای مکمل شده با سطوح 200، 150،100 میلی‌گرم در کیلوگرم جیره، در سیستم قفس با 4 تکرار 6 قطعه‌ای به صورت کاملاً تصادفی در قالب طرح فاکتوریل استفاده گردید. مکمل سازی جیره با سطوح و منابع مختلف عنصر روی تأثیری بر خوراک مصرفی و افزایش وزن بدن جوجه‌ها در هفته‌های اول و دوم نداشت اما ضریب تبدیل غذایی در هفته اول، دوم و خوراک مصرفی، افزایش وزن و ضریب تبدیل غذایی در هفته سوم و کل دوره تحت تأثیر سطوح مکمل سازی با منابع مختلف عنصر روی قرار گرفت (05/0>P). ذخایر عنصر روی استخوان درشت نی و کبد به طور خطی با افزودن سطوح مختلف منابع عنصر روی بجز اکسید روی A به جیره پایه افزایش یافت (05/0>P). بالاترین غلظت عنصر روی پانکراس فقط در جوجه‌های گوشتی تغذیه شده با جیره مکمل شده با 200 میلی‌گرم اکسید روی Bدر کیلوگرم جیره مشاهده گردید (05/0>P). استفاده از روش رگرسیون نسبت شیب براساس ذخایر روی درشت نی، کبد و پانکراس نسبت به میزان عنصر روی مصرفی از منابع مختلف نشان داد که براساس ذخایر عنصر روی درشت نی بالاترین ارزش زیست‌فراهمی نسبی در اکسید روی A، اکسید روی B و بیوپلکس روی به هنگام مکمل سازی جیره پایه با 150 میلی‌گرم از منابع مختلف عنصر روی در کیلوگرم جیره حاصل می‌گردد. لیکن ارزش زیست‌فراهمی تخمین زده شده براساس غلظت عنصر روی پانکراس، یک افزایش خطی را براساس افزایش سطح مصرف منابع مختلف عنصر روی، نشان داد. بالاخره در سطوح مصرف مساوی بالاترین ارزش زیست‌فراهمی متعلق به بیوپلکس روی بود.
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