Variations in Quality of Liquid and Frozen Semen at Various Temperatures

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Abstract
Ejaculates (92) of bovine semen were split into 2 portions; one portion was processed as liquid semen, the other as frozen semen. Each portion was further split into 3 parts which were incubated at 37, 20, and 7[degree]C. The semen was evaluated microscopically for percentage of motile sperm and rate of progessive motility at specified intervals during a 24 hour incubation period. Both frozen and liquid semen declined more rapidly in percentage of motile sperm and rate of motility at each higher temperature increment. At every incubation temperature, frozen semen showed a more rapid decline in both evaluation characteristics than did the corresponding liquid semen. At an incubation temperature of 37[degree]C, all samples of frozen semen were immotile within 6 hours.