پروفایل اسید چرب در شیر گاوهای جرسی تغذیه شده با علوفه سبز یا خشک

Subject Areas : Camel

ر. اورتگا پرز ¹ , ای. پالاسیوس مچتنوو ² , اُ. آرجونا لوپز ³ , ا. پالاسیوس اسپینوزا ⁴ , ب. موریلو آمادور ⁵ , ا. گیلن تروجیلو ⁶ , ج.ل. اسپینوزا ویلاویسنسیو ⁷

1 - Autonomous University of Baja California Sur, La Paz, Baja California Sur, Mexico
2 - Northwestern Center of Biological Research, La Paz, Baja California Sur, Mexico
3 - Northwestern Center of Biological Research, La Paz, Baja California Sur, Mexico
4 - Autonomous University of Baja California Sur, La Paz, Baja California Sur, Mexico
5 - Northwestern Center of Biological Research, La Paz, Baja California Sur, Mexico
6 - Autonomous University of Baja California Sur, La Paz, Baja California Sur, Mexico
7 - Autonomous University of Baja California Sur, La Paz, Baja California Sur, Mexico

Received: 2019-10-11 Accepted : 2019-12-15 Published : 2020-09-01

Keywords: اسیدهای چرب 3n-, گاوهای شیری, اسیدهای لینولئیک کونژوگه, یونجه سبز, واکسینیک اسید,

Abstract :

هدف از این مطالعه تعیین غلظت اسیدهای چرب (FA) خصوصاً اسیدهای چرب ترانس و لینولئیک کونژوگه شده در شیر گاوهای جرسی تغذیه شده با یونجه سبز (GA) یا یونجه خشک (AH) بود. 40 گاو جرسی با رکورد گوساله­زایی دو تا پنج، روز شیردهی 60 تا 90 و غیرآبستن در یک سیستم تولیدی محدود استفاده شدند. در یک تیمار (20GA n=) گاوها با یونجه سبز تازه خرد شده و کنسانتره تجاری تغذیه شدند. در تیمار دیگر (20AH n=)، گاوها با یونجه خشک و کنسانتره تجاری مشابه تغذیه شدند. یک نمونه شیر (10 میلی‌لیتر) از هر گاو جمع­آوری شد. لیپید کل، اسیدهای چرب استریفه شده متیله (FA)، و اسیدهای لینولئیک کونژوگه شده (CLA) توسط کروماتوگرافی تعیین شدند. مقدار اسیدهای چرب اشباع، تک­گانه و چندگانه غیر اشباع بین تیمارها مشابه بود (05/0P>). محتوای اسیدهای چرب امگا 3 و امگا 6، همچنین نسبت امگا 6: امگا 3 توسط نوع علوفه تحت تأثیر قرار نگرفتند (P>0.05). با این حال، غلظت‌های اسید ترانس واکسینیک (P<0.01)، اسید رامنیک (P<0.01)، کل اسیدهای چرب ترانس (P<0.001) و CLA تام (P<0.01) در گاوهای تغذیه شده با GA بالاتر بودند. ما نتیجه گرفتیم که مصرف یونجه خرد شده سبز در گاوهای جرسی تولید CLA و اسید واکسینیک ترانس 18:1 n-7 trans-11 در شیر را افزایش می‌دهد.

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