Factors affecting variability of daily gains of Simmental bulls in test

Abstract

In this paper the results of analysis of different source of variation that have influence on daily gains of simmental bulls in test are presented. The analyzed factors were year and month of calving, herd of origin and group in test. Year of calving was important source of variation for almost all daily gains while influence of month of calving as well as influence of group in test varying and depends on the nature of daily gains. Herd of origin was not significant source of variation for daily gains in test while was significant for ADG before test as well as for lifetime ADG.

U radu su prikazani rezultati analize različitih izvora vrijabilnosti koji svoj uticaj ostvaruju na prosečne dnevne priraste simentalskih bikova u performans testu. Ispitivani su uticaji godine i meseca teljenja, matične farme i grupe u testu. U zavisnosti od osobine, uticaj pojedinih faktora na varijabilnost prirasta je bio različit. Godina teljenja je bila važan izvor variranja za skoro sve analizirane priraste, dok je značajnost meseca teljenja, kao i grupe u testu varirala od prirasta do prirasta. Matična farma nije bila značajan izvor variranja za priraste u testu, ali je bila značajan za prirast pre testa i životni dnevni prirast.