بررسی اثر محدودیت و شوری آب مصرفی روی عملکرد، فراسنجه‌های خونی و قابلیت هضم ظاهری خوراک در بره‌های نر بلوچی
Subject Areas : Camelو. وثوقی-پوستین دوز 1 , ع. طهماسبی 2 , ع.ع. ناصریان 3 , ر. ولی زاده 4 , ه. ابراهیمی 5
1 - دانشگاه علوم کشاورزی و منابع طبیعی گرگان
2 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
3 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
4 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
5 - Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
Keywords: فراسنجه‌های خون, بره بلوچی, قابلیت هضم ظاهری, آب شور, محدودیت مصرف آب,
Abstract :
به منظور بررسی اثر محدودیت و شوری آب مصرفی بر عملکرد، فراسنجه‌های خونی و قابلیت هضم ظاهری خوراک در بره‌های نر بلوچی، از ۲۰ رأس بره نر (میانگین سن ٥±١٧۰ روز و میانگین وزن ٨/۲±٣١ کیلوگرم) بصورت فاکتوریل (۲×۲) در قالب طرح کاملاً تصادفی با 5 تکرار در هر تیمار استفاده شد. تیمار‌های آزمایشی شامل گروه اول: دسترسی آزاد به آب مصرفی با سطح سختی کم، گروه دوم: دسترسی به ٥۰ درصد میانگین آب مصرفی روزانه با سطح سختی کم، گروه سوم: دسترسی آزاد به آب مصرفی با سطح سختی زیاد و گروه چهارم: دسترسی به ٥۰ درصد میانگین آب مصرفی روزانه با سطح سختی زیاد، بودند. طول مدت آزمایش ٤۲ روز که شامل ١٤ روز عادت‌پذیری و ۲٨ روز دوره آزمایش بود. نتایج بدست آمده نشان داد که محدودیت آب منجر به ایجاد اختلاف معنی‌داری در ماده خشک و آب مصرفی، افزایش وزن روزانه و نسبت آب مصرفی به خوراک مصرفی، هورمون آلدوسترون، نیتروژن اوره‌ای خون، کلسترول، تری‌گلیسرید، هماتوکریت، کلر، پتاسیم، سدیم سرم،pH شکمبه و قابلیت هضم ADF،NDF، CP، ماده آلی، ادرار و مدفوع تولیدی در بره‌ها شده است (05/0>P)، از طرفی مصرف آب با سختی زیاد منجر به ایجاد اختلاف معنی‌داری در ماده خشک و آب مصرفی، افزایش وزن روزانه، نسبت آب مصرفی به خوراک مصرفی، سدیم سرم و ادرار تولیدی در بره‌ها شد (05/0>P). سایر پارامترهای اندازه‌گیری شده در بره‌های آزمایشی، تحت تأثیر محدودیت مصرف و شوری آب قرار نگرفت (05/0P>). با توجه به داده‌های بدست آمده می‌توان نتیجه‌گیری نمود که هر چند محدودیت آب و سختی آن می‌تواند اثرات منفی بر عملکرد و فیزیولوژی حیوان بگذارند ولیکن این حیوانات می‌توانند تا سطح ٥۰ درصد محدودیت و ٨۰۰۰ میلی‌گرم در لیتر شوری آب را تا حداقل برای مدت ۲٨ روز بدون تغییرات زیانبار و کشنده تحمل کنند
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