ارزیابی هورمون‌های تیروئیدی، گازهای خونی، وضعیت آنتی اکسیدانت بدن، فعالیت آنزیم‌های خون و خصوصیات استخوانی در جوجه‌های گوشتی تحت آسیت آلقایی به روش سرما

Subject Areas : Camel

ر.  عبدالکریمی ¹ (Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran)
م.ح.  شهیر ² (Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran)
م.  دانشیار ³ (Department of Animal Science, Faculty of Agriculture, Urmia University, Urmia, Iran)

Received: 2016-08-15 Accepted : 2016-10-31 Published : 2017-03-01

Keywords: عملکرد, جوجه‌های گوشتی, آسیت, ناهنجاری‌های پا,

Abstract :

تأثیر آسیت آلقایی توسط سرما بر عملکرد، وضعیت آنتی اکسیدانی، فعالیت آنزیم‌های خونی و متابولیسم استخوان با استفاده از 150 قطعه جوجه گوشتی ماده یکروزه (سویه راس 308) در قالب طرح کاملاً تصادفی با 2 تیمار، 5 تکرار و 15 قطعه جوجه در هر تکرار بررسی شد. تیمارهای آزمایشی جوجه‌های پرورش یافته تحت دمای طبیعی (شاهد) و تحت سرما (برای إلقای آسیت) تا 42 سن روزگی بودند. مصرف خوراک به طور معنی‌داری توسط شرایط سرمایی (آسیت) در دوره آغازین کاهش یافت (05/0>P). افزایش وزن پرندگان پرورش یافته تحت شرایط دمایی طبیعی در دوره­های آغازین، رشد، پایانی و کل دوره به طور معنی­داری بیشتر از مقدار مربوط به پرندگان تحت سرما بود (05/0>P). ضریب تبدیل خوراک پرندگان تحت تیمار سرما در دوره­های رشد، پایانی و کل دوره آزمایشی بیشتر از مقدار پرندگان تیمار شاهد بود (05/0>P). تلفات ناشی از آسیت پرندگان تحت سرما نیز در کل دوره آزمایشی بالاتر از مقدار مربوط به پرندگان تیمار شاهد بود (05/0>P). همچنین آسیت إلقایی توسط سرما باعث افزایش معنی­دار وزن بطن چپ، کل بطن، دیواره بطن و نسبت بطن راست به کل بطن در 42 روزگی شد (05/0>P). فشار اکسیژن، درصد اشباع شدن اکسیژن با هموگلوبین، pH و میزان T4 خون پرندگان تحت تیمار سرما کمتر از مقادیر پرندگان شاهد بود در حالیکه فشار دی اکسید کربن، میزان T3 و کلسیم خون پرندگان تحت سرما بیشتر از مقادیر پرندگان تیمار شاهد بود (05/0>P). طول استخوان تیبیا در پرندگان هر دو تیمار مشابه بود اما طول فمور در پرندگان تحت تیمار سرما کوتاهتر بود (05/0>P). قطر استخوان‌های تیبیا و فمور در پرندگان تحت تیمار سرما کمتر از پرندگان تیمار شاهد بود (05/0>P). همچنین ناهنجاری‌های پای بیشتری در پرندگان تحت تیمار سرما در کل دوره آزمایشی مشاهده شد (05/0>P). به طور کلی، آسیت إلقایی به روش سرما باعث کاهش عملکرد، افزایش تلفات و وقوع ناهنجاری‌های پا در جوجه‌های گوشتی گردید.

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