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Sows were injected with PGF analogue on days 111, 112 or 113 of pregnancy in an experiment involving 81 treated and untreated animals. The level of progesterone in the blood was determined in 4 treated sows. Compared with untreated controls, treatment significantly advanced the date of...

Niwa, T.; Suginome, Y.; Hashizume, T.
Bulletin of the Laboratory of Artificial Insemination, Iwate University, 1981, No. 2, pp 48-59