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اثر نوع مکمل چربی بر تولید و ترکیب شیر و فراسنجه‏های خون در دورۀ انتقال در گاو هلشتاین

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش آموخته دکتری، دانشکده علوم و مهندسی کشاورزی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، و استادیار بخش تحقیقات مدیریت پرورش دام و طیور موسسه تحقیقات علوم دامی کشور، کرج

2 دانشیار گروه علوم دامی، دانشکدۀ علوم و مهندسی کشاورزی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

3 استادیار بخش تحقیقات مدیریت پرورش دام و طیور مؤسسة تحقیقات علوم دامی کشور، کرج، ایران

4 استادیار گروه علوم دامی، دانشکدۀ علوم و مهندسی کشاورزی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

5 دانشیار گروه علوم دامی، دانشکدۀ علوم و مهندسی کشاورزی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران،

چکیده

هدف از آزمایش حاضر، ارزیابی تأثیر مصرف روغن ماهی در مقایسه با چربی اشباع پالم، بر سلامت پستان و عملکرد شیردهی در گاو هلشتاین بود. ده رأس گاو هلشتاین چندبارزاییده از شش هفته پیش از زایش تا 63 روز پس از آن مطالعه شدند. مقدار خوراک مصرفی و تولید شیر به‌طور روزانه، ترکیبات شیر، وزن و امتیار وضعیت بدنی به‌طور هفتگی و فراسنجه‌های خونی با فواصل 21 روز تعیین شدند. روغن ماهی موجب افزایش تولید شیر از هفتۀ ششم شیردهی به بعد گردید (05/0P<). از بین ترکیبات شیر، تنها درصد و مقدار چربی شیر تحت تأثیر نوع مکمل چربی قرار گرفت و در گاوهای دریافت‏کنندة روغن ماهی کاهش یافت (05/0P <). امتیاز (05/0P <) سلول‌های سوماتیک شیر با مصرف روغن ماهی کاهش یافت. در میان فراسنجه‌های خون، غلظت کلسترول کل، LDL- کلسترول و نسبت LDL به HDL سرم در گروه دریافت‌کنندة روغن ماهی در مقایسه با گروه مصرف‌کنندة چربی اشباع پالم کاهش معناداری یافتند (05/0P<). نتایج این مطالعه نشان می‌دهد مصرف روغن ماهی در دورة انتقال، علاوه بر حفظ تولیـد شیر، می‌تواند شدت توازن منفی انرژی را در اوایل شیردهی کاهش دهد و از بار میکروبی شیر نیز بکاهد.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of supplemental n-3 fatty acids during pre- and post-partum diets on health and production of Holstein dairy cows

نویسندگان [English]

  • Hoda Javaheri Barfourooshi 1
  • Armin Towhidi 2
  • Hasan Sadeghipanah 3
  • Mehdi Zhandi 4
  • Saeed Zeinodini 5
1 Ph.D. Graduate, Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran,
2 Associate Prof., Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran,
3 Assistant Prof., Department of Animal Production Management Research, Animal Science Research Institute, Karaj, Iran
5 Associate Prof., Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

The aim of this experiment was evaluating effect of fish oil versus palm oil on mammary gland health and milk production in Holstein cows. Ten multiparous Holstein cows were used from six week before up to 63 days after parturition. Feed intake and milk production were recorded daily, milk composition, body weight and body condition score were measured weekly and blood metabolites were determined 21 day intervals. Milk production with fish oil consumption was increased from 6th weeks of lactation (P<0.05). Among milk composition, only percentage and yield of milk fat were decreased in FO group (P<0.05). Milk somatic cell count (P=0.06) and score (P<0.05) were decreased with fish oil consumption. Among blood metabolites, serum total cholesterol, LDL-cholesterol and LDL to HDL-cholesterol ratio were decreased in FO group (P<0.05). Results indicated that consumption of fish oil in transition period besides conserving milk production can alleviate undesirable effects of negative energy balance in early lactation, and decrease milk somatic cell count.

کلیدواژه‌ها [English]

  • fish oil
  • dry period
  • milk yield and composition
  • Blood metabolites
  • Holstein cow
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