نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه علوم دامی دانشکده کشاورزی و منابع طبیعی دانشگاه اراک، کد پستی 8349- 8- 38156

2 هیئت علمی گروه علوم دامی دانشکده کشاورزی و منابع طبیعی دانشگاه اراک، کد پستی 8349- 8- 38156

چکیده

تأثیر استفاده از مکمل‌های موننسین، کروم و اثر متقابل آن ها در جیره دوره انتقال (14 روز قبل از زایش) با استفاده از 30 رأس گاو آبستن چند بار زایش کرده در قالب طرح کاملاً تصادفی با چهار تیمار بررسی شد. تیمارها شامل: 1) تیمار شاهد (بدون افزودنی)؛ 2) تیمار با مصرف موننسین (400 میلی‌گرم در روز)؛ 3) تیمار با مصرف کروم (03/0 میلی‌گرم در کیلوگرم وزن متابولیکی بدن) و 4) تیمار با مصرف کروم - موننسین (400 میلی‌گرم مکمل موننسین به همراه 03/0 میلی‌گرم بر کیلوگرم وزن متابولیکی بدن). فراسنجه‌های تولیدی (میزان شیر تولیدی و ترکیبات شیر) و تولید مثلی (روزهای باز و زمان آمدن جفت) مورد بررسی قرار گرفتند. ماده خشک مصرفی همانند میزان تولید شیر و درصد چربی، درصد پروتئین شیر و روزهای باز تحت ‌تأثیر جیره‌های آزمایشی قرار نگرفت. زمان خروج جفت در گاوهای دریافت‌کننده مکمل کروم - موننسین (120 دقیقه) نسبت به جیره شاهد (1/243 دقیقه) تفاوت معنی‌داری نشان داد (05/0>P). نتایج این آزمایش نشان داد تولید و ترکیبات شیر با استفاده از مکمل های موننسین و کروم تحت تاثیر قرار نگرفت اما با این وجود استفاده همزمان از این دو مکمل دارای پتانسیل در کاهش ناهنجاری‌های متابولیکی مانند جفت‌ماندگی در اوایل شیردهی می‌باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of supplementation of monensin and chromium in close-up diets on some production and reproduction parameters in Holstein dairy cows

نویسنده [English]

  • Mahdi Khodaei Motlagh 2

1

2 Arak University

چکیده [English]

Effect of supplementation of monensin (Mon), chromium (Cr) and their interaction in close-up period was investigated on 30 pregnant multiparous dairy cows in a completely randomized design with four treatments. Treatments were: 1) un-supplemented cows (CON), 2) Mon supplemented cows (400 mg Mon/d), 3) Cr supplemented cows (0.03 mg Cr/metabolic BW); 4) Mon-Cr supplemented cows (400 mg Mon/d plus 0.03 mg Cr/metabolic BW). The production and fertility parameters were recorded. Dry matter intake, milk yield, milk composition as well as open days did not show significant difference among treatments. Placenta delivery time was earlier in supplemented cows with Mon-Cr (120 minutes) compared to the control group (243.1 minutes) (p<0/05).  The results showed that although supplementation of Mon and Cr separately did not improve measured parameters in the preset study, supplementation of diet with both Mon and Cr could reduce placenta delivery time and hence could improve retained placenta in fresh cows.

کلیدواژه‌ها [English]

  • chromium
  • metabolic disorder
  • monensin
  • open days
  • Retained placenta
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