DeBenedetti, R.; Kiracofe, G.H.; Hultine, V.; McKee, R.M.; Schalles, R.R.
(Kansas State University. Agricultural Experiment Station, 1976)
Twenty-six Polled Hereford and Simmental-cross heifers that had not cycled by the beginning of the breeding season were given an ear implant and injected with an estrogen-progestogen compound. The implant was removed after ...