Teškoće kod telenja ocijenjene su u tri skupine od 12511 simentalskih, 15282 smeđih i 7924 crno šarenih prvotelki. Prosječni postotak teških telenja iznosio je 3.41% za simentalske, 2.91 za smeđe i 2.08 za crno šarene krave. Ocjena uzgojne vrijednosti bikova, kako očeva teladi (direktni učinak) tako i očeva prvotelkinja (indirektni učinak) prikazan je kao: a) jednostavno odstupanje od srednje vrijednosti pasmine odnosno b) ocjena uzgojne vrijednosti po BLUP metodi gdje su isključeni sljedeći utjecaji kao utjecaji interakcije: spol teladi x godina telenja, sezona telenja i ocjenjivač. Korelacija uzgojne vrijednosti između obje metode ocjene bile su unutar granica 0,75 i 0,84. Metoda b bila je točnija od metode a. Prema LSQ metodi, h² za teškoće kod telenja je nizak i kreće se od 0,01 do 0,02.Three groups of first lactation cows, consisting of 12511 Simmental, 15282 Brown and 7924 Black and White breeds were evaluated for difficult calving. The average percentage of difficult calving was 3.41% in Simmental, 2.91% in Brown, and 2.08 in Black/White breed. The evaluation of the sires, both as fathers of calves (direct effect) and as fathers of cows (indirect effect) is show. a) as a simple deviation from the average of the breed and b) as an evaluation of the breeding value according to the BLUP method, in which the following influences are eliminated as interacting ones: sex of the calves x year of calving x season of calving x evaluator. The correlations of breeding value between the two mentioned ways of evaluation are within limits of 0.75 to 0.84. Method b proved to be more exact than method a. According to method LSQ, h² for difficult calving is low. The values found are between 0.01 and 0.02
