title: Fertility of ram spermatozoa frozen-stored for 5 years.
mesh_terms: D000818:Animals; D004971:Estrus; D005260:Female; D005298:Fertility; D005615:Freezing; D008297:Male; D008858:Microscopy, Phase-Contrast; D011247:Pregnancy; D011309:Preservation, Biological; D012756:Sheep; D013094:Spermatozoa; D013997:Time Factors