On 15.09.2011, in the conference hall of IBIR-BAS, a doctoral thesis was defended by Alexander Kukov, junior researcher in the team of ReProForce project. The theme of PhD thesis was “Investigation the role of selected seminal plasma proteins during in vitro storage of ram spermatozoa”. The presentation of PhD thesis provoked an interest in the present guests who asked many questions. A certain questions of dissertation were discussed. The scientific jury gave a positive assessment for the defence of PhD thesis and awarded the scientific degree "Doctor" to Alexander Kukov.