Effects of storage temperature and extension media on motility of caprine spermatozoa

The survivability of caprine spermatozoa was compared in semen extenders prepared from the conventional egg-yolk citrate and goat-milk citrate. Motility was comparable in both sets of extenders during the first 24 hours post-extension when extended ejaculates were stored at either room temperature (28 °C) or refrigerator temperature (5 °C). Motility in goat milk citrate extenders at 5°C was significantly higher (p 0.05) than that stored at 28OC and in egg-yolk citrate extenders at both investigated temperature (p 0.05) 48 hours post extension. Beyond 72 hours of storage, motility in both extenders and at both temperature was less than 40%. The results showed that goat milk in part can replace egg-yolk as a medium for semen extension. Therefore, an extender with concentration of 10-20 % heated goat milk, 70-80% sodium citrate and 10% egg-yolk could be used to store goat semen at 5 °C for 2-3 days.