Milk fat chemical composition of yak breeds in China

He, Shenghua; Ma, Ying; Wang, Jiaqi; Li, Qiming; Yang, Xin; Tang, Shanhu; Li, Haimei

doi:10.1016/j.jfca.2010.07.008

Cited by 47 publications

(31 citation statements)

References 41 publications

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“…The contents of protein and fat are approximately 44 and 48% higher in yak milk than in cow milk (Table 1), which agrees well with the findings of Li et al (2010) and He et al (2011). However, the contents of protein and fat were similar between YMP and CMP, which ensured that the mice in YMP-M and CMP groups received the same levels of fat and protein.…”

Section: Resultssupporting

confidence: 86%

Anti-fatigue effect of yak milk powder in mouse model

Zhang

Cao

et al. 2014

Dairy Sci. & Technol.

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It has been speculated that the adaptation of Tibetan residents for high altitude and oxygen-deficient environment might be associated with their long-term consumption of yak milk. In order to verify the hypothesis, the anti-fatigue effect of yak milk powder (YMP) was investigated after oral treatment for 5 weeks in mouse model using forced swimming test. The results showed that the forced swimming time of YMP groups was increased by 46-112% in a dose-dependent manner. The content of hepatic glycogen was increased by 26-40% and the level of serum triglyceride was decreased by 30%; the exercise-induced accumulations of blood lactic acid and serum urea nitrogen were lower in YMP groups than in the control group. In addition, compared with the control group, YMP groups had lower glutamic oxalacetic transaminase and lactic dehydrogenase levels. It could be concluded that yak milk could increase an endurance capacity and alleviate fatigue.

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Section: Resultssupporting

confidence: 86%

Anti-fatigue effect of yak milk powder in mouse model

Zhang

Cao

et al. 2014

Dairy Sci. & Technol.

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“…The yak (Bos grunniens) is a rare and valuable livestock in China. Chinese yaks are divided into 12 breeds, the Gannan yak is one of the main yak breeds in China and is distributed on the Gannan Tibetan autonomous prefecture of Gansu (100846?Á104845?E;33806?Á35843?N) at an average altitude above 3000 m (He et al 2011). Due to their long-term daily pasture intake, yaks have attracted the attention of many researchers.…”

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confidence: 99%

Color stability and antioxidant capacity of yak meat as affected by feeding with pasture or grain

et al. 2015

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-R. 2015. Color stability and antioxidant capacity of yak meat as affected by feeding with pasture or grain. Can. J. Anim. Sci. 95: 189Á195. The objective of the present study was to analyze the effect of pasture or grain on color stability and antioxidant capacity of M. longissimus lumborum (LL) from pasture-fed (PF) or grain-fed (GF) yaks. The color stability and metmyoglobin percentage (MetMb%) were determined during 9 d of aerobic refrigerated storage. The antioxidant capacity was estimated by the total phenolics content, Trolox equivalent antioxidant capacity (TEAC), and ferric reducing antioxidant power (FRAP). Compared with the GF group, the LL from the PF group showed significantly (PB0.05) higher redness (a* values), with lower decline rate in a* values (PB0.05) over 1 to 7 d of refrigerated storage. The LL from the PF group had a significantly (PB0.05) lower metmyoglobin accumulation rate. At the end of storage, the muscle's MetMb% of the PF and GF group were 46.33 and 56.66%, respectively. The PF group showed significantly higher total phenolics content ('23.94%; PB0.05) in muscles, resulting in greater TEAC and FRAP, which were 24.81 and 3.99% higher than the GF group (PB0.05), respectively. In conclusion, the pasture enhanced antioxidant capacity of yak meat and contributed to improve the meat color stability.Key words: Yak meat, color stability, Antioxidant capacity, phenolics, pasture, grain Chen, C., Han, L., Yu, Q.-L. et Li, R.-R. 2015. La stabilite´de couleur et la capacite´antioxydante de la viande de yak selon une alimentation au paˆturage ou aux grains. Can. J. Anim. Sci. 95: 189Á195. L'objectif de la pre´sente e´tude e´tait d'analyser les effets de l'alimentation au paˆturage ou aux grains sur la stabilite´de couleur et la capacite´antioxydante du muscle M. longissimus lumborum (LL) chez les yaks nourris au paˆturage (PF Á « pasture-fed ») ou aux grains (GF Á « grain-fed »). La stabilite´de couleur et le pourcentage de metmyoglobine (MetMb%) ont e´te´de´termine´s durant 9 jours d'entreposage re´frige´re´en conditions ae´robiques. La capacite´antioxydante a e´te´estime´e par de´termination des contenus totaux en compose´s phe´noliques, capacite´antioxydante e´quivalente Trolox (TEAC Á « Trolox equivalent antioxidant capacity »), et la puissance antioxydante de re´duction ferrique (FRAP Á « ferric reducing antioxidant power »). Par rapport au groupe GF, le LL du groupe PF de´montrait une rougeur (a* values) significativement plus e´leve´e (PB0,05), avec plus faible taux de de´clin de a* values (PB0,05) au cours des jours 1 a`7 d'entreposage re´frige´re´. Le LL du groupe PF avait un taux d'accumulation de metmyoglobine significativement plus bas (PB0,05) a`la fin de la pe´riode d'entreposage, le MetMb% des muscles des groupes PF et GF e´taient de 46,33 % et 56,66 %, respectivement. Le groupe PF avait une plus forte teneur en compose´s phe´noliques ('23,94 %; PB0,05) dans les muscles, ce qui se soldait par de plus grandes valeurs de TEAC et de FRAP, qui e´taient de 24,81 % et 3,99 % plus e´leve...

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“…The contents of fat and protein between YMP and CMP are at the same levels, which ensured mice in YMP-M and CMP groups received the same levels of fat and protein. The results of anti-hypoxia activity of YMP were better than CMP, which could be associated with higher proportions of branched chain amino acid, conjugated linoleic acid (CLA) and Fe in yak milk He et al 2011;Liu et al 2011). These nutrients could exert synergetic effects for the anti-hypoxia activity of YMP.…”

Section: Resultsmentioning

confidence: 99%

“…China has the largest population of yaks in the world, approximately 14 million, that accounts for 95% of the total world population of yak (He et al 2011). Yak milk ranks in third place after cow and buffalo milks in economic importance in China (Zhong et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Yak milk is the main source of dietary protein, fat, and micronutrients for Tibetan residents who adapt well at a high altitude and low oxygen environment (Dong et al 2007). Yak milk contains high contents of total solids (16.9%-17.9%), protein (4.9%-5.9%), and fat (5.5%-7.5%) Wu et al 2009;He et al 2011). It has been speculated that adaptation of the Tibetan to the environment is related to their diet rich in yak milk.…”

Section: Introductionmentioning

confidence: 99%

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A preliminary study on anti-hypoxia activity of yak milk powder in vivo

Zhang

Cao

et al. 2014

Dairy Sci. & Technol.

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International audienceYak milk is the main source of dietary protein, fat, and micronutrients for Tibetan residents, who live at a high altitude and oxygen-deficient environment. The anti-hypoxia activity of yak milk powder (YMP) was investigated in mouse hypoxia models, using the normobaric hypoxia test, sodium nitrite toxicosis test, and hematological parameters analyses. The results showed that YMP could prolong the survival time under both normobaric hypoxia and sodium nitrite toxicosis conditions by 15.7%–17.3% and 13.9%–15.1%, respectively, and increase the levels of red blood cells (RBC) and blood hemoglobin (Hb). Furthermore, YMP was better than cow milk powder (CMP) in anti-hypoxia activity. YMP could be explored as a novel anti-hypoxia functional food ingredient

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Milk fat chemical composition of yak breeds in China

Cited by 47 publications

References 41 publications

Anti-fatigue effect of yak milk powder in mouse model

Anti-fatigue effect of yak milk powder in mouse model

Color stability and antioxidant capacity of yak meat as affected by feeding with pasture or grain

A preliminary study on anti-hypoxia activity of yak milk powder in vivo

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