This study was undertaken to see the capacitation response with the group of heparin (HBPs) and gelatin binding (GBPs) stallion seminal plasma proteins. Frozen thawed stallion spermatozoa were incubated with heparin (10 mu g/ml) in the presence of HBPs and GBPs @ 20, 40 and 60 mu g/ml. The percentage of capacitated sperm was evaluated after the induction of acrosome reaction with progesterone (100 mu g/ml) from 0 and 4 h. Significant differences were observed in the percentage of acrosome reacted spermatozoa at 4 h incubation between HBPs treated and control groups. The GBPs treated group showed non significant difference. The highest value of acrosome reacted sperm was seen in HBPs 40 mu g, and in GBPs 60 mu g. It can be concluded that the addition of HBPs enhanced the capacitation responses, and best dose level was 40 mu g of protein in HBPs groups for induction of acrosome reaction.
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