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Blood samples were collected throughout the oestrous cycle from 5 Landrace gilts and 2 multiparous Landrace sows. The duration of the plasma LH preovulatory surge ranged from 1 to 5 days (mean 2.6±0.36). Females accepted the ♂ on the day of the LH surge. The correlation between duration of LH surge ...

Niwa, T.; Kanematsu, S.; Yanaka, T.; Hashizume, T.; Yamanaka, H.
Bulletin of the Laboratory of Artificial Insemination, Iwate University, 1981, No. 2, pp 25-32