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Studies on the Activity of Superoxide Distumase (SOD) in Cow's Milk

WANG Hui sheng 1, CHEN Hai ping 1, and BIAN Jun 2 (1.Teaching and Experimental Farm, Northwest Agro forestry Sci tech University,Yangling, Shaanxi 712100, China; 2. Xi'an Institute of Dairy Science, Xi'an, Shaanxi 710068, China)  
The SOD activity in cow's milk was studied using pyrogallol autoxidation method. During the lactation period, the SOD activity decreased in the order of colostrum, milk at the end of lactation, and normal milk with the value of 11.4, 8.0, and 6.9 respectively, the SOD activity changed regularly with the progress of lactation, the SOD activity of colostrum at one day after calving was the greatest and then decreased quickly with the coefficient of variation (C.V) of 16.5%; for normal milk the SOD activity decreased in 1st and 2nd lactation month, was the lowest in 3rd and 4th lactation month, then increased in 5th and 6th lactation month, and remianed stable in 7th and 8th lactation month with the C.V of 26.0%; the SOD activity of milk at the end of lactation was relatively constant with the C.V of 13.2%; and there was a certain differences in SOD activity of milk from individual cows.
【CateGory Index】: S879.1
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