CONGIU, L. et al. (2011) – Zootier Lexikon https://www.zootier-lexikon.org/bibliographie/c-1699975706/congiu-l-pujolar-j-m-forlani-a-cenadelli-s-dupanloup-i-barbisan-f-galli-a-fontana-f-2011
Genetic data showed that the F1 stocks have only retained part of the genetic variation