Leslie, K.E., Walton, J.S., Bateman, K.G. and Shantz, R.K. 1986. Controlled breeding of dairy heifers: Observations over a five year period. The Bovine Practitioner. 21 (Nov. 1986), 146–149. DOI:https://doi.org/10.21423/bovine-vol0no21p146-149.