Use of Human Chorionic Gonadotropin (hCG) for fixed-time artificial insemination in buffalo (Bubalus bubalis) - Carvalho, Nelcio Antonio Tonizza de; Nichi, Marcilio; Henriquez, C. E. P; Oliveira, Cláudio Alvarenga de; Baruselli, Pietro Sampaio (Animal Reproduction, 2007)