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Summary. Fowl and turkey spermatozoa, when diluted in a glutamate-based medium and incubated at 40\s=deg\Cunder aerobic conditions showed a similar rate of oxygen utilization and maintained similar cellular ATP concentrations. Under anaerobic con- ditions, the glycolytic metabolism of fowl spermatozoa was sufficient to maintain a high ATP concentration, whilst turkey spermatozoa had a much lower glycolytic ability and their ATP levels fell rapidly. The maintenance of high sperm ATP concen- trations was directly related to subsequent fertilizing ability of the spermatozoa. Dilu- ted fowl semen showed good fertilizing ability ( > 70%) under aerobic conditions and under anaerobic conditions in the presence of 10 mM-glucose, but diluted turkey semen maintained good fertilizing ability only under aerobic conditions.

Maintenance of ATP concentrations in and of fertilizing ability of fowl and turkey spermatozoa in vitro