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HANUS OTO, HERING PAVEL, CHLADEK GUSTAV, FALTA DANIEL, ROUBAL PETR, JEDELSKA RADOSLAVA. 2014. Reliability of Milk Recording Data Under Conditions of Automatic Milking System. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 62(5): 911–917. Automatic milking system (AMS) brings a change in approach to ensure the data reliability in the offi cial milk recording (MR). The AMS is equipped with fl owmeter. AMS so ware provides the daily milk yield (DMY) and average of the last 7 daily milk yields (AVG7) for MR. Classic MR uses DMY. AVG7 could be more reliable value. Origin of both records (DMY and AVG7) is from AMS fl owmeter. The aim of paper was to compare the values of milk yield of cows from daily (DMY) and the extended records (AVG7) from AMS for objective assess of lactations to be used in cattle breeding. Study (2013) with 2 AMS herds (DeLaval and Lely Astronaut): herd 1 – Holstein (H) dairy cows; herd 2 – Czech Fleckvieh (CF) dairy cows. There were following milk records: n = 521 DeLaval (H); n = 567 Lely Astronaut (CF); 70 (H) and 68 (CF) dairy cows. MR samples were analyzed on: fat content; crude protein; somatic cell count. Correlations between AVG7 and DMY were: 0.888 (H); 0.898 (CF, both P ≤ 0.001). There were insignifi cant diff erences (P > 0.05; −0.07 ± 3.29 kg for H and 0.28 ± 3.3 kg for CF) between AVG7 and DMY for both robots. The same is valid for diff erences in the production of milk components. According to this comparison experiment the AVG7 of AMS is a suitable equivalent for the DMY regarding offi cial MR for assessment of lactations.