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In order to study the variability and heritability of directly measured  traits (growth and body development traits) in performance test of Simmental  bulls the data on 371 bulls born and tested over the period of 13 years were  used in the analysis. The data were analyzed in order to estimate year and  month of calving, herd of origin and group in test effect as well as error  components. The components of variance were obtained using restricted maximum  likelihood (REML) methodology applied to sire model. The year and month of  birth had different effect on the variability of the growth traits, while the  herd of origin and the test group manifested a consistent, highly significant  effect on those growth traits which they could have an effect on. On the  other hand, all the body development traits were under a constant and highly  significant effect manifested by the year of calving, while the month of  calving manifested its effect, during test, at different levels of  statistical significance. A decreased effect of herd of origin on almost all  body dimensions from the start until the end of performance test was  universally observed. Heritability estimates for pre-test ADG, in-test and  lifetime ADG were 0.27, 0.39 and 0.29, respectively. Heritability estimates  for body weights were 0.23, 0.25, and 0.30 for birth weight, test-on weight,  and test-off weight, respectively. Heritability estimates for test-off height  at withers, circumference of chest, depth of chest and body length were 0.43,  0.30, 0.33 and 0.29

Source of variation and heritability of directly measured traits in performance testing of Simmental bulls