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The objective was to determine the effect of plasma progesterone concentration and the duration of proestrus during growth of the ovulatory follicle on fertility in beef cattle. Heifers (N=61) and postpartum cows (N=79) were assigned randomly to four groups in a two-by-two design involving...

Dadarwal, D.; Mapletoft, R. J.; Adams, G. P.; Pfeifer, L. F. M.; Creelman, C.; Singh, J.
Elsevier, New York, USA
Theriogenology, 2013, 79, 5, pp 859-866