Split-time artificial insemination in beef cattle: I–Using estrous response to determine the optimal time(s) at which to administer GnRH in beef heifers and postpartum cows

B.E. Bishop, J.M. Thomas, J.M. Abel, S.E. Poock, M.R. Ellersieck, M.F. Smith, D.J. Patterson 

Theriogenology 86 (2016) 1102–1110