China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (3): 865-872.doi: 10.16431/j.cnki.1671-7236.2021.03.010

• Physiology and Biochemistry • Previous Articles     Next Articles

Differential Proteomic Study of Colostrum and Mature Milk of Hu Sheep Based on Two-dimensional Electrophoresis Technology

WENG Xiuxiu, LIU Xinxin, YUE Xiangpeng, LI Wanhong, LI Fadi   

  1. State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
  • Received:2020-07-16 Online:2021-03-20 Published:2021-03-18

Abstract: The objective of this experiment was to analyze the differential proteomic between colostrum and mature milk of sheep,and provide further insight into the proteome characteristics during different lactation periods.6 Hu sheep with the same parity and similar due date were selected to collect colostrum on the 1st,3rd,7th day and mature milk on the 14th,28th,56th day postpartum.6 units of milk were mixed as a tested sample with equal volume at each time point,and defatted milk was prepared by removing the fat from the whole milk.The defatted milk of colostrum and mature milk were analyzed by two-dimensional electrophoresis (2-DE).The results showed that the content of milk protein was higher in colostrum,and decreased with the extension of lactation stage.According to the 2-DE map of milk protein on the 1st day,38 different protein spots were detected on the 3rd day,20 of which only existed on the 1st day and 1 only existed on the 3rd day,the other 17 protein spots showed differential expression.On the 7th day,35 different protein spots were detected,19 of which only existed on the 1st day and 1 only existed on the 7th day,the other 15 protein spots showed differential expression.On the 14th day,34 different protein spots were detected,11 of which only existed on the 1st day and 1 only existed on the 14th day,the other 22 protein spots showed differential expression.On the 28th day,38 different protein spots were detected,28 of which only existed on the 1st day and 1 only existed on the 28th day,the other 9 protein spots showed differential expression.On the 56th day,36 different protein spots were detected,26 of which only existed on the 1st day and 1 only existed on the 56th day,the other 9 protein spots showed differential expression.To sum up,a total of 44 differentially expressed protein spots were detected,8 of which only existed on the 1st day of postpartum,and these proteins were mainly involved in immunological activity.

Key words: two-dimensional electrophoresis (2-DE); Hu sheep; colostrum; mature milk; proteomic

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