Updated project metadata. Haemonchus contortus has developed complexed and multifaceted mechanisms of immune evasion to enable the survival in the host. Generating excretion and secretion products (ESPs) to subvert or suppress the functions of host cytokines is a newly immune regulatory pattern found during recent years. TGF-β1 has critical immune regulatory functions in nematode infections. In this study, the co-immunoprecipitation was used to collect the molecules which bound to the goat TGF-β1 from ESPs, and the precipitates were identified by mass spectrometry using shotgun LC-MS / MS.