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Physiological and Biochemical Characteristics of Lactation in Half-lactating Yak

Agricultural Sciences in China 2002年第6期1卷 696-701页

作者： ZHENG Yu-cai, ZHONG Guang-hui, WANG Yong, PENG Xian-wen, MAO Yong-jiang, ZOU Si-xiang, CHEN Wei-hua and CHEN Jie( Department of Animal Science and Technology, South-west Nationalities University, Chengdu 610041 , P. R . China Laboratory of Animal Physiology and Biochemistry, Nanjing Agricultural University, Nanjing 210095 , P.R.China) Department of Animal Science and Technology Southwest Nationalities University Chengdu 610041 P. R . China Laboratory of Animal Physiology and Biochemistry Nanjing Agricultural University Nanjing 210095 P. R. China

Yaks of two lactating types, the half-Iactating yak and the total lactating yak, were investigated in their milk compositions, milk coagulation properties, and contents of three kinds of hormones, glucose, and protein in plasma. The half-lactating Maiwa yak and Jiulong yak contained significantly higher contents of protein, fat, and activities of alkaline phosphatase and Y-glutamyl transpeptidase in milk than that of the corresponding total-lactating yak breeds, with reduced milk yield and similar lactose level and relative percentages of main milk protein components. The half-lactatin yak resembled yaks in a late stage of lactation in their biochemical composition of milk; however, significant differences were also observed, which indicated that the former was in a special stage of lactation quite different from dairy cows. milk of the total-lactating or half-lactating yaks could be coagulated normally by adding chymosin, with a similar coagulation time. No significant difference was observed between prolactin and progesterone concentrations in plasma of the half-lactating yaks and total-lactating yaks; however, half-lactating yaks had significantly lower level of oestradiol-17 β in plasma than total-lactating yaks.

关键词： Yak milk Enzyme Hormone milk coagulation

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