Optimizing the use of sex-sorted sperm in timed artificial insemination programs for suckled beef cows - Sá Filho, M. F; Girotto, Ricardo; Abe, E. K; Penteado, L; Campos Filho, E. P; Moreno, J. F; Sala, Rodrigo Vasconcellos; Nichi, Marcilio; Baruselli, Pietro Sampaio (Theriogenology, 2012)