Mieczysław Ratajszczak (born 1922) Since 1951 assistant substitute in the Chair of Special Animal Breeding at Poznań University (headed by prof. Tadeusz Vetulani).
Prepare his master dissertation under direction of prof Vetulani ( Slaughter cattle in the Wielkopolska region on basis of slaughter records of the Poznań abbatoir/ Bydło rzeźne Wielkopolski w oparciu o uboje w rzeźni w Poznaniu). Further head of the Department of Pig Breeding and Production. Known for his works on improvement of domestic pigs. Created (in collaboration with prof. Stefan Alexandrowicz) local (Polish) domestic pig spacies: 'złotnicka biała' and 'złotnicka pstra'.