Waggoner, A.W.; Dikeman, M.E.; Brethour, J.R.
(Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1989)
Eighty-seven 3/8 Simmental x 5/8 Hereford heifers calved at 2 years of age and were
designated as Single-Calf-Heifers (SCH). Twenty-six heifer mates that did not calve were
designated as 2-year-old open heifers (2-OH), ...