نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته دکتری،گروه علوم دامی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران

2 دانشیار،پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، تخصص: فیزیولوژی دام

3 دانشیار،دانشگاه تهران، پردیس کشاورزی و منابع طبیعی، تخصص: تغذیه دام

4 دانشیار،پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، تخصص: تغذیه دام

5 دانش آموخته دکتری گروه علوم دامی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران

چکیده

اثر کاهش نسبت اسیدهای چرب امگا-6 به امگا-3 جیره بر ماده خشک مصرفی، تولید و ترکیبات شیر، عملکرد تخمدانی و غلظت استرادیول و پروژسترون خون گاوهای تازه زا با استفاده از 24 رأس گاو هلشتاین چند شکم زایش بررسی شد. تیمارهای آزمایشی شامل: 1-جیره‌های حاوی نسبت کم (2/5 به 1) اسیدهای چرب امگا-6 به امگا-3؛ 2-جیره‌های حاوی نسبت متوسط (4/5 به 1) اسیدهای چرب امگا-6 به امگا-3 و 3-جیره‌های حاوی نسبت زیاد (6/5 به 1) اسیدهای چرب امگا-6 به امگا-3 بودند. ماده خشک مصرفی و تولید شیر دام‌ها روزانه اندازه گیری شد. نمره وضعیت بدنی دام‌ها و ترکیبات شیر اندازه گیری شد. برای بررسی عملکرد تخمدانی، از روش سونوگرافی تخمدان استفاده شد. نتایج نشان داد که ماده خشک مصرفی و کیفیت شیر تحت تأثیر تیمارها قرار نگرفت. تولید شیر گاوهائی که جیره‌های حاوی نسبت کم و متوسط اسیدهای چرب امگا-6 به امگا-3 را دریافت کردند بیشتر از سایر گاوها بود (p<0/05). غلظت هاپتوگلوبین شیر در گاوهای تغذیه شده با جیره حاوی نسبت زیاد اسیدهای چرب امگا-6 به امگا-3، بیشتراز سایر گاوها بود(p<0/05). غلظت پروژسترون خون در گاوهای تغذیه شده با جیره نسبت زیاد به طور معنی داری کاهش پیدا کرد/0p<0/05). براسا نتایج حاصل تعدیل نسبت امگا-6 به امگا-3 جیره موجب افزایش تولید شیر و بهبود عملکرد تخمدان در گاوهای تازه زا می شود.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of reducing dietary ratio of the omega-6 and omega-3 essential fatty acids on milk production and ovarian performance in fresh Holstein dairy cows

نویسندگان [English]

  • Mir Hossein Najafi 1
  • saeed zeinoaldini 2
  • Abolfazl Zali 3
  • mahdi Ganjkhanlou 4
  • Hossein Mohammadi 5

1 University College of Agriculture &amp; Natural Resources, University of Tehran

2 Animal science, university of tehran

3 University College of Agriculture &amp; Natural Resources, University of Tehran

4 University College of Agriculture &amp; Natural Resources, University of Tehran

5 Department of Animal Science, Faculty of Agricultural Sciences, University of Tabriz

چکیده [English]

This study was conducted to investigate the effect of reducing dietary ratio of omega-6/omega-3 essential fatty acid (EFA) on dry matter intake, yield and milk composition, ovarian performance and blood concentrations of estradiol and progesterone using 24 multiparous Holstein cows. Experimental treatments including different n-6 to n-3 EFA ratio; namely, 2.5, 4.5, or 6.5 parts of n-6 to 1 part of n-3 EFA. Dry matter intake and milk yield of cows were recorded daily. Also, body condition score and milk composition were recorded and ovarian activity was monitored by transrectal ultrasound scanning. Dry matter intake and milk composition were not affected by treatments. Daily milk yield was significantly higher in low and medium n- 6/n-3 FA ratio diets in comparison to high diet (P<0.05). Cows assigned to high n-6/n-3 FA ratio diet had greater plasma Haptoglobin concentrations compared to other diets (P<0.05). Results indicated that number of large follicles was greater in medium diet than high diet (P<0.05). Progestrone concentration was significantly decrease in high diet treatment (P<0.05). Results of this study indicate that modulating dietary n-6/n-3 FA ratio could lead to a higher milk yield and improve ovarian performance in fresh cows.

کلیدواژه‌ها [English]

  • Fresh cow
  • haptoglobin
  • Milk production
  • n-6/n-3 ratio
  • reproductive performance

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