Effect of heparin binding proteins on the in vitro sperm characters and lipid peroxidation status of frozen thawed bull semen

Fertility associated proteins such as osteopontin, bovine seminal plasma proteins (BSP A1, A2, A3), heparin binding proteins (HBP) and others are reported as indicators of bull fertility (Moura et al. 2006). HBPs were secreted from the prostate, seminal vesicles and bulbo-urethral glands into seminal fluid and bind to sperm at ejaculation.