求助sciencedirect文献，有链接，谢谢！

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第一、Journal of Dairy Science Volume 88, Issue 2, February 2005, Pages 580-584；Association Between Live Body Weight and Milk Urea Concentration in Holstein Cows； D. Hojman1, , , M. Gips2, E. Ezra；
! I1 V/ s+ ^7 y连接：http://www.sciencedirect.com/sci ... i/S00220302057272117 n& B: G- [7 H$ A/ _

  L5 z5 ?0 S, f第二、Livestock Production Science ；Volume 12, Issue 1, January 1985, Pages 47-57 ；Urea concentrations in milk in relation to milk yield, live weight, lactation number and amount and composition of feed given to dairy cows；R Oltner, M Emanuelson, H Wiktorsson% N: u! I$ S, G/ _2 J* M
连接：http://www.sciencedirect.com/science/article/pii/0301622685900399' x' }+ w! Y2 K. w
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