TITLE: Undiluted or extended storage of ram epididymal spermatozoa as alternatives to 1 refrigerating the whole epididymes 2 3 4 5 J Tamayo-Canul 1,2 , M. Alvarez 1,2 , E. López-Urueña 1,2 , M. Nicolas 1,2 , F. Martinez- 6 Pastor 1,3 , E. Anel 1,2 , L. Anel 1,2 and P de Paz 1,3 7 8 1 ITRA-ULE, INDEGSAL, University of León, 24071, León, Spain 9 2 Animal Reproduction and Obstetrics, University of León, 24071, León, Spain 10 3 Molecular Biology, University of León, 24071, León, Spain 11 12 13 Corresponding author: Tel. +34 9872911320, E-mail ppazc@unileon.es . 14 15 16 17 *Manuscript