Effect of cold shock and cooling rate on calcium uptake of ram spermatozoa

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Journal Article
Animal Reproduction Science, 1986, 12 (2), pp. 131 - 143
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Rapid cooling (cold shock) of washed ejaculated ram sperm irreversibly reduced motility and respiration and greatly increased uptake of 45Ca2+. The effect was greater as the temperature of cooling was reduced from 15°C to 0°C, and a substantial increase in sperm calcium levels was even observed after slow cooling to temperatures below 10°C. The rise in calcium uptake on freezing sperm to -79°C was not as great as that on cold shocking sperm to 0°C. Inactivation of sperm by mild heat (50°C) had no significant effect on calcium uptake but subsequent cold shock increased the sperm calcium. Reverse immobilization of sperm by low concentrations of formaldehyde significantly reduced calcium uptake on cold shock. Addition of detergents to sperm immediately reduced motility, respiration and calcium uptake of control and cold-shocked sperm to zero. © 1986.
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