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Five factorial experiments were conducted to examine the effects of concentration of tris(hydroxymethyl)aminomethane (Tris), type and concentration of sugar in the diluent, rate and method of dilution on the survival of goat spermatozoa after freezing by the pellet method. Spermatozoa tolerated a relatively wide range in concentration of Tris, but the cell survival depended on the type of sugar included in the Tris diluent. Glucose and fructose were more suitable components than lactose or raffinose. Survival of spermatozoa after thawing was better for three- to fivefold prefreezing dilution. There was interaction between method of semen dilution (one-step, two-step), holding time at 5 degrees C, and glycerol concentration. The best result was obtained after one-step dilution at 30 degrees C (Tris 375 mM-glucose 41.625 mM-citric acid 124 mM), 1.5 h holding at 5 degrees C, and with 4% (v/v) glycerol concentration in the diluted semen.

Deep Freezing of Angora Goat Semen: Effects of Diluent Composition and Method and Rate of Dilution on Survival of Spermatozoa