title: The effect of semen extenders and sperm number on mare fertility.
mesh_terms: D000818:Animals; D005260:Female; D005298:Fertility / Q000187:drug effects*; D006736:Horses / Q000502:physiology*; D007315:Insemination, Artificial / Q000662:veterinary; D008297:Male; D011247:Pregnancy; D011309:Preservation, Biological; D012661:Semen; D013094:Spermatozoa; D014325:Tromethamine
chemical_list: D014325:Tromethamine