مقایسه اثر منابع اسیدهای چرب اشباع و غیر اشباع در دوره آماده به زایش بر فعالیت تخمدانی گاوهای شیری هلشتاین

نویسندگان

1 گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج-ایران

2 گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی دانشگاه زنجان، زنجان-ایران

3 دانشکده دامپزشکی دانشگاه تهران، تهران-ایران

چکیده

زمینه مطالعه: استفاده از منابع مختلف چربی و اثر اسیدهای چرب بر روی عملکرد  تخمدان از موضوعاتی روز مراکز علمی و تحقیقاتی می‌باشد. ‌ ‌هدف: هدف از انجام این آزمایش بررسی تأثیر تغذیه منابع مختلف چربی (از لحاظ پروفایل اسید چرب) در دوره‌ آماده به زایش  بر سنجش جمعیت و اندازه فولیکول‌های تخمدان و فراسنجه‌های خونی مرتبط با وضعیت انرژی بدن در پس از زایش در گاوهای هلشتاین بود. روش کار: بدین منظور 15 رأس گاو شیری هلشتاین انتطار به زایش (حدود 30 روز به زایش) انتخاب و به صورت تصادفی در هریک از 3 تیمارآزمایشی توزیع گشتند که شامل 1) کنترل ( منبع کربو هیدراتی)، 2)  مکمل پودر چربی (محتوی اسیدهای چرب اشباع) و 3)  سویای حرارت داده شده (محتوی اسیدهای چرب غیر اشباع)  بودند. برای بررسی وضعیت متابولیکی گاوها در دوره گذار،  نمونه خون از همه گاو‌ها در روزهای 21-، 14-، 7-، 1، 7، 14، 21 مربوط به زایش گرفته شد همچنین ماده خشک مصرفی و نمره بدنی دام‌ها نیز اندازه‌گیری گردید و برای بررسی عمل‌کرد تخمدانی، گاوها در 2 دوره 10 روزه بعد از زایش مورد اولتراسونوگرافی تخمدان قرار گرفتند. نتایج: تفاوت معنی‌داری در غلظت گلوکز  و کلسترول در بین تیمارها مشاهده گردید. همچنین در دوره اول اولتراسونوگرافی تعداد کلاس‌های فولیکولی بزرگ از لحاظ عددی در گاوهای تغذیه شده با مکمل‌های چربی نسبت به گروه کنترل بیشتر بود. در دوره دوم نیز تفاوت معنی‌داری بین 3 گروه تیماری مشاهده نشد. نتیجه‌گیری‌نهایی: با توجه به نتایج این آزمایش به نظر می‌رسد  اسیدهای چرب غیر اشباع  برای بهبود دادن وضعیت انرژی و نهایتاً عملکرد تخمدان  مزیت بیشتری نسبت به اسید‌های چرب اشباع دارند.
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کلیدواژه‌ها

عنوان مقاله [English]

A comparison of the effect of food sources of saturated and unsaturated fatty acids on ovarian activity of holstein dairy cows in close up period

نویسندگان [English]

  • Sadegh Hashemi 1
  • Mahdi Ganjkhanlou 1
  • Mehdi Dehghan-banadaky 1
  • Abolfazl Zali 1
  • Amir Akbari Afjani 2
  • Manochehr Amini 3
  • Ahmad Pourakbari 2
1 Department of Animal Sciences, University College of Agriculture and Resources, University of Tehran, Karaj-Iran
2 Department of Animal Sciences, Faculty of Agriculture, University of Zanjan, Zanjan-Iran
3 Faculty of Veterinary Medicine, University of Tehran, Tehran- Iran
چکیده [English]

BACKGROUND: Application of different sources of fatty acids and their effect on ovarian performance is a current issue in animal science and research centers. OBJECTIVES: The purpose of this study was to determine the effect of different fatty acids in close-up period on population and size of follicles and measuring blood parameters related to the energy state of the body after calving of lactating dairy cows. METHODS: In this study 15 Holstein cows were selected by expected date of parturition (around 30 days before calving) and assigned them randomly within treatments diets. The diets were formulated to be isonitrogenous. Cows were fed 1) control (carbohydrate source), 2) Rumen-protected fat (RF) (saturated fatty acids) and 3) Roasted Soybean (RS) (unsaturated fatty acids). Blood sample was collected at 7 day intervals in -21, -14, -7, 1, 7, 14, 21 periods of calving. Also dry matter intake and body condition score cows were recorded. Ovarian activity was monitored by daily transrectal ultrasound scanning from 30 to 40 and 61 to 70 DIM. RESULTS: Average plasma glucose and cholesterol concentration were significantly different among treatment groups. Numerically, follicular classes were higher in cows, fed with fat diet compared with control group. CONCLUSIONS: According to the results of this experiment, it seems that application of polyunsaturated fatty acids, to improve the energy and ultimately the function of the ovaries, has more advantage than saturated fatty acids.
 
 

کلیدواژه‌ها [English]

  • close-up period
  • Fatty acids
  • ovarian activity
  • roasted soybean

مراجع

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