کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2454274 | 1110380 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fatty Acid Profile in Milk Fat from Qinghai Plateau Yak at Different Altitudes and Parities1
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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چکیده انگلیسی
Qinghai Plateau yak are the most important grazing livestock for milk and beef production on the Qinghai-Tibetan plateau because they are adapted to extremes of cold environment and higher elevation and can be grazed throughout the year. Milk samples (n = 47) from Qinghai Plateau yak cows of different parities and milk samples (n = 6) from Qinghai yellow cattle cows were analyzed using gas chromatography-mass spectrophotometry. Differences in fatty acid profiles of Qinghai Plateau yak milk fat from rangelands at 3 different elevations, at 2 parities, and between species were compared. Additionally, fatty acid profiles of forages from different elevations were analyzed. Fatty acid percentages (g/100Â g total fatty acids) in milk fat of Qinghai Plateau yak from different rangelands were largely similar, but there were differences (P < 0.05) in individual fatty acids, including conjugated linoleic acid. There were also elevation differences in fatty acid percentages (e.g., cis-9, cis-12Â C18:2 and cis-9, cis-12, cis-15Â C18:3; g/100Â g total fatty acids) of forage plants. Milk from multiparous Qinghai Plateau yak cows showed greater (P < 0.01) percentages of C18:1 and C18:2, total unsaturated fatty acids, total monounsaturated fatty acids, and total polyunsaturated fatty acids and lesser (P < 0.01) percentages of total saturated fatty acids than primiparous counterparts. The cis-9, trans-11 conjugated linoleic acid isomer percentage in milk fat from multiparous cows was greater (P < 0.01) than from primiparous cows. The study results also suggested that short-chained, medium-chained, and saturated fatty acid percentages of milk fat were greater (P < 0.05) for Qinghai Plateau yak compared with those of Qinghai yellow cattle.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Professional Animal Scientist - Volume 24, Issue 5, October 2008, Pages 479-487
Journal: The Professional Animal Scientist - Volume 24, Issue 5, October 2008, Pages 479-487
نویسندگان
Y.S. Peng, M.A. PAS, J.P. Wu, L.X. Wei, J.L. Wu, D.Z. Sanbei,