Patterson, D.J.; Corah, L.R.; Brethour, J.R.; Negus, W.R.
(Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1987)
Records of age at puberty (AAP) and postpartum interval to estrus (PPI) for
heifers calving first at 2 years of age were used to determine the relationship
between the two reproductive parameters. In Brahman x Hereford ...