STORAGE OF EXTENDED BOAR SEMEN AT 5°C: EFFECTS OF EXTENDER, COOLING METHOD AND INCUBATION TIME

Posted in: Pork Insight Articles, Production by admin on July 6, 2017

Sperm motility was affected by the cooling rate used. Stepwise cooling to 17°C favoured total motility values during the six days of storage if the sperm were stored at 5°C without incubation at 17°C. In contrast, progressive motility values for sperm incubated at 17°C for 24 hr prior to storage at 5°C were greater when the sperm were directly cooled to 17°C.

While progressive and total motilities were superior when sperm were stored at 17°C, adequate motility values were possible when sperm were stored at 5°C but depended on a 24h incubation period at 17°C. Viability and normal morphology values for sperm stored at 5°C following 24 hr incubation at 17°C did not differ from sperm stored at 17°C.

These results indicate that extended boar semen can be stored at 5°C with acceptable values of sperm motility, viability and normal morphology over time. Progressive and total motilities were most sensitive to the decrease to 5°C. Based on these results, the optimum method is to directly cool the sperm to 17°C, followed by incubation at 17°C for 24 hr prior to lowering the temperature to 5°C. It is important to note that these are laboratory results and an insemination trial is required to confirm these laboratory findings prior to implementation in the field.

STORAGE OF EXTENDED BOAR SEMEN AT 5°C

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