Using docility EPDs to drive selection and to cull problem animals, Limousin breeders put strong selection pressure on disposition and made remarkable gains to improve docility. Rapid genetic progress was possible given the strong heritability of 0.40 estimated for the Limousin breed.
Limousin breeders have been using docility EPDs since 1998, when NALF published the first genetic evaluation for docility. By placing a strong emphasis on selection for calmer cattle in their breeding programs, they have improved the temperament of Limousin cattle dramatically.
The figure shows the genetic trend in docility as measured by the average docility EPD for Limousin cattle born from 1985 through 2007. The graph shows cattle born in 1990 had an average docility EPD of about +1, and those born in 2007 averaged +15. That is a 14-point increase in 17 years, which is quite remarkable considering tools for genetically improving temperament have been around since only 1998.