The Effect of Different Levels of Rapeseed Meal with and without Enzyme on the Performance and the Serum Level of Triiodothyronine (T3), Thyroxine (T4) and Thyroid Stimulating Hormone (TSH) in Broiler Chickens
محورهای موضوعی : Camel
1 - Department of Animal Science, Ilam Branch, Islamic Azad University, Ilam, Iran
کلید واژه: Enzyme, broiler chicken, thyroid, rapeseed meal,
چکیده مقاله :
In order to investigate the effect of different levels of rapeseed meal on performance and content of triiodothyronine (T3), thyroxine (T4) and thyroid stimulating hormone (TSH) in broiler chickens’ blood, 640 1-d-old Ross male broiler chickens were studied through a 4 × 2 factorial arrangement including 4 levels of rapeseed meal (RSM) (0, 5, 10 and 15 percent) and two levels of enzyme (0 and 0.05%) with a completely randomized design and 4 replicates. Feed intake weight gain and feed conversion ratio were measured at 8, 21 and 42 days of age. In order to investigate the level of T3, T4 and TSH at the end of each period, three chickens from each treatment group were sampled for blood collection. Results indicated that different levels of RSM and enzyme separately had no significant effect on the feed conversion ratio, weight gain and feed intake (P≥0.05). However, the interaction effect of rapeseed RSM and enzyme significantly improved the feed intake (P≤0.05). Treatments significantly affected the amount of T3 and TSH in blood serum that was decreased, with adding rapeseed and enzyme into the diet, while the level of T4 was not affected significantly. Therefore, according to obtained results, it seems that rapeseed RSM can be used in the diet of broiler chickens up to 15% without decreasing their performance.
این آزمایش به منظور بررسی اثرات سطوح مختلف کنجاله کانولا بر عملکرد و مقدار T3، T4 و هورمون محرک تیروئید (TSH) جوجه های گوشتی انجام گردید. تحقیق حاضر در 8 تیمار به صورت آزمایش فاکتوریل 2 × 4 شامل 4 سطح کنجاله کانولا (0، 5،10 و 15 درصد) و دو سطح آنزیم (0 و 05/0 درصد) در قالب طرح کاملاً تصادفی با 4 تکرار انجام شد. مصرف خوراک، افزایش وزن و ضریب تبدیل غذایی در 8، 21 و 42 روزگی اندازهگیری شدند. به منظور بررسی سطوح T3، T4 و هورمون محرک تیروئید در انتهای دوره، سه جوجه از هر گروه تیمار برای اندازهگیری محتویات خون انتخاب شدند. نتایج نشان داد، که سطوح مختلف کنجاله کانولا و آنزیم از لحاظ ضریب تبدیل غذایی، افزایش وزن و مصرف خوراک اختلاف معنیداری وجود نداشت (05/0>P). درحالیکه اثرات متقابل کنجاله کانولا و آنزیم بر بهبود مصرف خوراک اثر معنیداری داشت (05/0>P). تیمارها اثرات معنیداری بر مقدار T3 و TSH در سرم خون که کاهش را نشان دادند، داشت. با افزایش کنجاله و آنزیم در جیره مقدار T4 به صورت معنیداری تحت تأثیر قرار نگرفت. لذا براساس نتایج به نظر میرسد کنجاله کانولا را میتوان در جیره جوجههای گوشتی بدون کاهش در عملکرد تا سطح 15 درصد استفاده نمود.
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