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Open AccessCommunication
Int. J. Mol. Sci. 2011, 12(8), 4885-4895; doi:10.3390/ijms12084885

The Chemical Composition and Nitrogen Distribution of Chinese Yak (Maiwa) Milk

School of Food Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
Research and Development Central of New Hope Dairy Holding Company, Chengdu 610041, China
Guelph Food Research Center, Agriculture and Agri-Food Canada, 1341 Baseline Road, Ottawa, Ontario, K1A 0C5, Canada
Author to whom correspondence should be addressed.
Received: 10 June 2011 / Revised: 13 July 2011 / Accepted: 22 July 2011 / Published: 2 August 2011
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
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The paper surveyed the chemical composition and nitrogen distribution of Maiwa yak milk, and compared the results with reference composition of cow milk. Compared to cow milk, yak milk was richer in protein (especially whey protein), essential amino acids, fat, lactose and minerals (except phosphorus). The contents of some nutrients (total protein, lactose, essential amino acids and casein) were higher in the warm season than in the cold season. Higher ratios of total essential amino acids/total amino acids (TEAA/TAA) and total essential amino acids/total non essential amino acids (TEAA/TNEAA) were found in the yak milk from the warm season. However its annual average ratio of EAA/TAA and that of EAA/NEAA were similar to those of cow milk. Yak milk was rich in calcium and iron (p < 0.05), and thus may serve as a nutritional ingredient with a potential application in industrial processing.
Keywords: chemical composition; nitrogen distribution; seasonal changes; yak milk chemical composition; nitrogen distribution; seasonal changes; yak milk
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Li, H.; Ma, Y.; Li, Q.; Wang, J.; Cheng, J.; Xue, J.; Shi, J. The Chemical Composition and Nitrogen Distribution of Chinese Yak (Maiwa) Milk. Int. J. Mol. Sci. 2011, 12, 4885-4895.

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