Post‐Thaw Motility, ATP Content and Cytochrome C Oxidase Activity of A. I. Bull Spermatozoa in Relation to Fertility

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Summary: Relationship between post‐thaw sperm motility, ATP content, Cytochrome c oxidase (Ceo) activity and fertility (56 days non‐return) were determined in frozen‐thawed semen. Semen was obtained from 47 A. I. bulls, and only ejaculates with a post‐thaw sperm motility of ≥ = 50% were used. The post‐thaw sperm motility was 52.7 ± 6.9 % (x̄ ± SD) at 30 min. The overall mean concentration of ATP was 18.7 ± 5.6 nmol/spermatozoa × 108. Sperm motility, Cytochrome c oxidase activity and ATP content were found to be related to each other (r = 0.57‐0.64; p ≤ 0.05‐0.001). However, only ATP content showed a statistical significant but negative correlation (r = ‐0.24) with fertility. No correlation was found between post‐thaw motilitiy and fertility (56 days non‐return within examined freezings).The results obtained raise doubts about the usefulness of sperm motility as an indicator of the fertilizing ability of frozen‐thawed semen with a post‐thaw motility of ≥ = 50%.

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