Fatty Acid Profile in Milk of Jersey Cows Fed Green Forage or Hay
محورهای موضوعی : Camel
ر. اورتگا پرز
1
(Autonomous University of Baja California Sur, La Paz, Baja California Sur, Mexico)
ای. پالاسیوس مچتنوو
2
(Northwestern Center of Biological Research, La Paz, Baja California Sur, Mexico)
اُ. آرجونا لوپز
3
(Northwestern Center of Biological Research, La Paz, Baja California Sur, Mexico)
ا. پالاسیوس اسپینوزا
4
(Autonomous University of Baja California Sur, La Paz, Baja California Sur, Mexico)
ب. موریلو آمادور
5
(Northwestern Center of Biological Research, La Paz, Baja California Sur, Mexico)
ا. گیلن تروجیلو
6
(Autonomous University of Baja California Sur, La Paz, Baja California Sur, Mexico)
ج.ل. اسپینوزا ویلاویسنسیو
7
(Autonomous University of Baja California Sur, La Paz, Baja California Sur, Mexico)
کلید واژه: dairy cows, conjugated linoleic acids, fatty acids n-3, green alfalfa, vaccenic acid,
چکیده مقاله :
The objective of this study was to determine the concentration of fatty acids (FA) especially conjugated linoleic and trans fatty acids in milk from Jersey cows fed green alfalfa (GA) or alfalfa hay (AH). Forty Jersey cows that had from two to five calvings, 60 to 90 lactation days and were not pregnant were used in a confined production system. In one treatment (GA n=20) cows were fed chopped fresh green alfalfa and commercial concentrate. In the other one (AH n=20), they were fed alfalfa hay and the same commercial concentrate. A milk sample (10 mL) was collected from each cow. Total lipids, methyl-esterified fatty acids (FA), and conjugated linoleic acids (CLA) were determined by chromatography. The amount of saturated, monounsaturated and polyunsaturated FA were similar between treatments (P>0.05). The content of FA omega-3 and omega-6, as well as the proportion of omega-6:omega-3 were not affected by the type of forage (P>0.05). However, the concentrations of vaccenic acid-trans (p < 0.01), rumenic acid (p < 0.01), total FA trans (p < 0.001), and total CLA (p < 0.01) were higher in cows fed GA. We conclude that consumption of green chopped alfalfa in Jersey cows increased production of 18:1 n-7 trans-11 trans-vaccenic acid and CLA in milk.
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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