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(Exp. 2) Mean (± s.e.m.) percentage of sperm positive for hypo-osmotic swelling test (HOST) in stallion groups with foaling rates of < 60% or > 60%. Number of mares per stallion was > 20. HOSTF0 = HOST with fluorometer after 0-h incubation; HOSTF3 = HOST with fluorometer after 3-h incubation; HOS0 = HOST with light microscopy after 0-h incubation; HOS3 = HOST with light microscopy after 3-h incubation.
