New genetic evaluation of fertility in Swiss Brown Swiss


  • Birgit Gredler Qualitas AG
  • Urs Schnyder Qualitas AG


fertility, fitness, genetic evaluation, Brown Swiss cattle


A new five-trait fertility model was developed for Brown Swiss cattle in Switzerland. The current model considers non-return-rate 56 in cows and days to first service only. The new model includes traits measured in heifers and cows. The traits evaluated were non-return-rate 56 and interval between first and last insemination in heifers and cows and days to first service. Estimated heritabilities were low for all traits and ranged from 0.015 to 0.063. Breeding values were estimated using a multi-trait animal model. The reliability of fertility breeding values could be improved through incorporation of heifer data and new traits.