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Effect of different concentrations of caffeine, VE on the freezing semen of small-tailed Han sheep
Cui Xu1, Luo Guihe2, Li Weidong3, Li Fuhuang4, Meng Danna2, Lü Jianwei1, Mu Di1,
Chinese Agricultural Science Bulletin . 2010, (8): 1 -6 .  DOI: 10.11924/j.issn.1000-6850.2009-2101