A Spearfish couple has endowed the Cal and Mary Hayenga Department Head of Animal Science at South Dakota State University. Cal, a 1969 agriculture major, and his wife, Mary, a 1967 sociology major, utilized a.
SPEARFISH, S.D. - Cal and Mary Hayenga, a couple from Spearfish, have made a significant contribution to South Dakota State University (SDSU) by endowing A Spearfish, S.D., couple have endowed the SDSU Department of Animal Science.