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AI with semen from 2 Landrace boars that had been stored for 22.6 years resulted in the birth of 10 and 9 piglets, respectively, from 2 sows 115-116 days later. AI with semen from another 3 boars that had been stored for 25-26 years did not result in pregnancy.

Niwa, T.; Hashizume, T.; Mori, A.; Matsubara, E.; Yoshida, S.; Kitazume, K.; Matsumoto, N.
Japanese Society of Swine Science, Atsugi-shi, Japan
Japanese Journal of Swine Science, 2003, 40, 4, pp 186-194