نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

2 استاد، دانشکده علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

3 استادیار، دانشکده علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

چکیده

به منظور بررسی تاثیر جایگزینی بخشی از دانه غلات با سطوح مختلف دو اسید چرب اشباع پالمیتیک و استئاریک، بر عملکرد بره­های پرواری، از 30 راس بره نر آمیخته دالاق-رومانوف به مدت 89 روز استفاده شد. تیمارهای آزمایشی عبارت بودند از: 1- جیره شاهد بدون مکمل اسید چرب 2- جیره پایه با 3 درصد اسید پالمیتیک، 3- جیره پایه با 3 درصد اسید استئاریک، 4- جیره پایه با 3 درصد مخلوط 67 درصد اسید پالمیتیک و 33 درصد اسید استئاریک و 5- جیره پایه با 3 درصد مخلوط 67 درصد اسیداستئاریک و 33 درصد اسید پالمیتیک. عملکرد رشد (شامل ماده خشک مصرفی، افزایش وزن روزانه و ضریب تبدیل غذایی)، قابلیت هضم مواد مغذی و غلظت فراسنجه­های خونی (شامل گلوکز، نیتروژن اوره­ای خون (BUN)، کلسترول؛ تری­گلیسرید، لیپوپروتئین با چگالی بالا (HDL)، لیپوپروتئین با چگالی پایین (LDL) و آنزیم­های کبدی) اندازه­گیری شد. نتایج نشان داد تیمار­های آزمایشی اثر معنی­داری بر ماده خشک مصرفی، ضریب تبدیل غذایی و افزایش وزن روزانه بره­ها نداشت (05/0<P). افزودن مکمل اسید چرب به جیره­های آزمایشی کاهش معنی­دار قابلیت هضم ماده خشک را در پی داشت (05/0>P). غلظت لیپوپروتئین با دانسیته بالا در جیره­های حاوی مکمل اسید چرب افزایش معنی­داری پیدا کرد (05/0P<). به­طورکلی با توجه به نتایج این پژوهش می­توان گفت که افزودن اسید پالمیتیک و استئاریک تا سطح 3 درصد ماده خشک جیره به صورت جداگانه و یا مخلوط با هم، هیچ­گونه تاثیر معنی­داری بر عملکرد بره­های پرواری ندارد.

کلیدواژه‌ها

عنوان مقاله [English]

Effects of feeding palmitic and stearic fatty acids on growth performance, nutrient ‎digestibility and blood parameters of fattening lambs

نویسندگان [English]

  • Hossein Baee 1
  • Taghi Ghoorchi 2
  • Abdolhakim Toghdory 3

1 Ph.D. Candidate, Department of Animal & Poultry Nutrition, Faculty of Animal Sciences, Gorgan ‎University of Agricultural Sciences & Natural Resources, Gorgan, Iran‎

2 Professor, Department of Animal & Poultry Nutrition, Faculty of Animal Sciences, Gorgan University of Agricultural Sciences & ‎Natural Resources, Gorgan, Iran‎

3 Assistant Professor, Department of Animal & Poultry Nutrition, Faculty of Animal Sciences, Gorgan University of Agricultural ‎Sciences & Natural Resources, Gorgan, Iran‎

چکیده [English]

In order to investigate the effect of partial replacement of cereal grains with different levels of calcium saltd of palmitic and stearic saturated fatty acids on the performance of fattening lambs, 30 male Dalagh-Romanov lambs were used for 89 days. Experimental treatments included: 1- control diet (without fatty acid), 2- diet with 3 % palmitic acid  (PA), 3- diet with 3% stearic acid (SA), 4- diet with 3 %(67% PA+ 33% SA), 5- diet with 3 %(67% SA+ 33% PA). Growth performance (dry matter intake, average daily gain and feed convertion ratio), nutrient digestibility and blood parameters (glucose, blood urea nitrogen, cholesterol, triglyceride, high-density lipoprotein (HDL), low-density lipoprotein (LDL) and liver enzymes) were measured. The results showed that experimental treatments had no significant effect on dry matter intake, feed conversion ratio and daily weight gain of lambs (P>0.05). Addition of fatty acid supplement to experimental diets significantly reduced dry matter digestibility (P<0.05). The concentration of high-density lipoprotein in diets containing fatty acid supplementation increased significantly (P<0.05). In conclusion, the results suggest that adding 3% )on the ration dry matter basis) PA and SA as alone or combine together in the diet for fattening lambs could be done without negative effects.

کلیدواژه‌ها [English]

  • Blood metabolites
  • Fatty acid
  • Fattening lamb
  • nutrient digestibility
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