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56 cows received a norgestomet implant and an injection of norgestomet and oestradiol valerate; half (n = 28) received 500 IU equine chorionic gonadotropin (eCG) at implant removal, 9 days later. A third group (n = 25) received 2 injections of cloprostenol (500 µg) 11 days apart. The percentage of...

Kastelic, J. P.; Olson, W. O.; Martinez, M.; Cook, R. B.; Mapletoft, R. J.
Canadian Veterinary Journal, 1999, 40, 3, pp 173-178