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Tadesse, M. ,  Dessie, Tadelle ,  Tessema, G. ,  Degefa, T. ,  Gojam, Y. ,  [Study on age at first calving, calving interval and breeding efficiency of Bos taurus, Bos indicus and their crosses in the highlands of Ethiopia] ,  Study on age at first calving, calving interval and breeding efficiency of Bos taurus, Bos indicus and their crosses in the highlands of Ethiopia