Morrison, D.G.; Kiracofe, G.H.; Heersche, G. Jr.; Schalles, R.R.; McKee, M.
(Kansas State University. Agricultural Experiment Station, 1975)
Eighty-three cows were each treated with a nine-day Syncro-mate B
ear implant and one estrogen and progesterone injection. After implant removal, cows were artificially inseminated either 48, 54 or 60 hours later or 12 ...