اثر اسپرس و نسبت‌ علوفه به کنسانتره بر توازن نیتروژن، بیوهیدروژناسیون و ترکیب اسیدهای چرب شیر در میش‌های شیرده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای تغذیه دام گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه کشاورزی و منابع طبیعی رامین خوزستان، اهواز، ملاثانی، ایران

2 دانشیار، گروه علوم دامی، دانشکدة علوم دامی و صنایع غذایی، دانشگاه کشاورزی و منابع طبیعی رامین خوزستان، اهواز، ملاثانی، ایران

3 استادیار، بخش تغذیه دام، موسسه علوم دامی کشور، کرج، ایران

چکیده

این آزمایش با هدف بررسی اثر علوفه اسپرس و نسبت‌های علوفه به کنسانتره بر مصرف خوراک، توازن­ نیتروژن، ترکیب اسیدهای چرب،بیوهیدروژناسیون شکمبه­ای و ترکیب اسیدهای چرب شیر با استفاده از هشترأس میش نژاد لری در قالب طرح مربع لاتین 4×4 تکرار شونده انجام شد. تیمارهای یک تا چهار به ترتیب با نسبت­های علوفه به کنسانتره 65:35(با و بدون اسپرس) و 35:65 (با و بدون اسپرس) تنظیم شد. مقدار ماده خشک مصرفی بین جیره‌های آزمایشی ­اختلاف معنی‌داری نداشت.ا بقای نیتروژن در میش­هایی­ که جیره بانسبت علوفه به کنسانتره 65:35(با اسپرس) و 35:65(با و بدون اسپرس) را دریافت کردند، بیشتر بود (05/0P<). جیره حاوی کنسانتره بالاشامل اسپرس (تیمار ­یک) بیشترین ­غلظت اسید  واسنیک­ همراه با غلظت ­کم تر­اسید استئاریک را در مایع شکمبه­ داشت(05/0P<). میزان بیوهیدروژناسیون ظاهری جیره حاوی کنسانتره بالا شامل اسپرس(تیمار­یک) نسبت به سایر تیمارها برای اسید اولئیک،لینولئیک ­و لینولنیک­ به ترتیب 2/10، 3/12 و 1/7 درصد کاهش داشت­(05/0P<).ا ثر تیمارهای­آزمایشی ­­برغلظت­اسیدهای­ چرب­و اسنیک، ­­لینولئیک­کانژوگه، لینولئیک­ و لینولنیک­ چربی شیر معنی‌دار و جیره حاوی کنسانتره بالا شامل اسپرس (تیمار ­یک) درمقایسه با سایر تیمارها بیشتر بود ­(05/0P<). بر اساس نتایج حاصل، تغذیه میش­های شیرده با جیره­های حاوی کنسانتره بالا و علوفه­اسپرس موجب افزایش غلظت اسید واسنیک و اسید لینولئیک کانژوگه در چربی شیر شد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of sainfoin and forage:concentrate ratio on nitrogen balance, biohydrogenation and milk fatty acid profile in dairy ewes

نویسندگان [English]

  • Behrouz Yarahmadi 1
  • Morteza Chaji 2
  • Mohammad Boujarpour 2
  • Khalil Mirzadeh 2
  • Morteza Rezaei 3
1 Ph.D. Student, Department of Animal Science, Faculty of Animal and Food Science, Ramin Agricultural and Natural Resources University of Khouzestan
2 Associate Professors, Department of Animal Science, Faculty of Animal and Food Science,Ramin Agricultural and Natural ResourcesUniversity of Khouzestan
3 Assistant Professor, Department of Animal Nutrition, Animal Sciences Research Institute, Karaj, Iran.
چکیده [English]

This experiment was carried out the aim of the effect of sainfoin forage and forage:concentrate ratios on feed intake, nitrogen balance,ruminal biohydrogenation and milk fatty acid profile in dairy ewes using of eight Lori breed ewes according to a replicated 4 × 4 Latin square design. Treatments were adjusted from one to four according to forage:concentrate ratios of 35:65 with and without sainfoin and  65:35 with and without sainfoin. Dry matter intake was not significant among experimental diets. Retention of N was higher in ewes that receiveddiets consist of forage:concentrate ratios of 35:65 with sainfoin and  65:35 with and without sainfoin (P<0.05). The high concentrate diet with sainfoinwas the most vaccenic acid concentration accompanied by the less concentrations of stearic acid in ruminal liquor (P<0.05).  Apparently biohydrogenation ofhigh concentrate diet with sainfoin (treatment one) decreased for oleic, linoleic and linolenic acid with 10.2, 12.3­and ­7.1%, respectively (P<0.05). Experimental diets effect were significant on vaccenic acid, conjugated linoleic acid, linoleic acid and linolenic acidconcentrationsin milk fat (P<0.05).In base onobtained the results,feeding of  dairy ewes with high concentrate diets  consist of sainfoin forage were an important due to  increased conjugated linoleic acid and vaccenic acid concentration in milk fat.

کلیدواژه‌ها [English]

  • Dairy ewe
  • forage to concentrate ratio
  • Milk fatty acid profile
  • Sainfoin
  • Biohydrogenation
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