Milk Yield and Milk Mineral Element Contents of Grazing Yaks in Different Phenological Periods in Alpine Pastures in the Source Area of Three Rivers

ZHOU Yixiu; HAO Lizhuang; LIU Shujie

doi:10.3969/j.issn.1006-267x.2020.08.033

2020 , Vol. 32 >Issue 8: 3742 - 3749

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.08.033

Milk Yield and Milk Mineral Element Contents of Grazing Yaks in Different Phenological Periods in Alpine Pastures in the Source Area of Three Rivers

ZHOU Yixiu ,
HAO Lizhuang ,
LIU Shujie

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1. Qinghai Plateau Yak Research Center, State Key Laboratory of Plateau Ecology and Agriculture, Key Laboratory of Plateau Grazing Animal Nutrition and Feed Science of Qinghai Province, Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining 810016, China

Received date: 2020-02-20

Online published: 2020-08-13

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Abstract

This experiment was to explore the effects of different phenological periods of pasture on alpine natural grassland on the milk yield and mineral element contents of grazing yak in the source area of Three Rivers. Ten healthy lactating yaks with the same parity and physical condition were selected as the research objects, and the milk yield was recorded of grazing female yaks in the withered period (from December to April), regreen period (May), grassy period (from June to August) and withering period (from September to November). The collected milk samples were subjected to the determination of mineral element (K, Na, Ca, Mg, Fe, Mn, Zn, Co and Cu) contents. The results showed that:1) the contents of Na, Mg, Fe, Mn and Cu of the grass were significantly higher than those in other phenological periods (P<0.05), while the contents of K, Ca and Co of grass in the withered periods were significantly higher than those in other phenological periods (P<0.05), the content of Zn increased with the phenological period turning. 2) The milk yield of grazing yak in the grassy period was significantly higher than that in other phenological periods (P<0.05). The contents of K, Na, Ca, Mg, Mn and Cu in yak milk in the grassy period were significantly higher than those in other phenological periods (P<0.05), and the Co content of yak milk in the withered periods was significantly higher than that in other phenological periods (P<0.05). The contents of Fe and Zn in yak milk were significantly higher than those in other phonological period (P<0.05). 3) The correlations of Na, Mg, Mn, Co, and Cu between forage and yak milk were significant in different phenological periods. The correlation values were 0.723 (P<0.01), 0.996 (P<0.01), 0.975 (P<0.05), 0.981 (P<0.05) and 0.967 (P<0.01), respectively. It can be concluded that the yak milk yield and the contents of mineral elements in milk will change as the contents of mineral elements in forage in different phenological periods. From the withered periods to the grassy periods, the yak milk yield show a gradually increasing trend. Then it gradually decreases with the forage withering period. The Na, Mg, Mn, Co, and Cu contents in yak milk will increase with the increase of corresponding element contents in the forage.

Key words： grazing yak; phenology; yak milk; milk yield; minerals

Cite this article

ZHOU Yixiu , HAO Lizhuang , LIU Shujie . Milk Yield and Milk Mineral Element Contents of Grazing Yaks in Different Phenological Periods in Alpine Pastures in the Source Area of Three Rivers[J]. Chinese Journal of Animal Nutrition, 2020 , 32(8) : 3742 -3749 . DOI: 10.3969/j.issn.1006-267x.2020.08.033

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