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Progesterone levels in jugular plasma samples indicated that exogenous progesterone treatments were not interfering with the development of corpora lutea, but were inducing premature luteal regression. It was observed that short cycles occurred only in ewes treated before day 4 of the oestrous...

Bray, A. R.; Wodzicka-Tomaszewska, M.; Hecker, J. F.
VIIIth International Congress on Animal Reproduction and Artificial Insemination, Krakow, July 12-16, 1976. Proceedings. Volume I. Communication Abstracts., 1976, pp 43