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TOMANKOVA, O., HOMOLKA, P.: Comparison of ruminal degradability of starch of maize grain and maize silages by in vitro method. Acta univ. agric. et silvic. Mendel. Brun., 2009, LVII, No. 1, pp. 165–170 The objective of this experiment was to determine the ruminal degradability of starch using the in vitro method. Maize silages from whole plants (MS), maize cob silage prepared by ensiling of the cobs with bracts (MCS), and maize grain silages (MGS) were compared with maize grain (MG). The tested feeds diff ered in total starch contents. Averaged starch contents with standard deviation values were 343.3 ± 18.7 g / kg for MS; 522.0 ± 8.9 g / kg for MCS; 727.9 ± 16.9 g / kg for MGS; and 682.8 ± 22.6 g / kg dry matter for MG. The in vitro ruminal degradability of starch was determined by the feed incubation period – for 2, 4, 6, 16 and 24 hours. The higher degradation was observed at the 4-h of incubation for maize silage from whole plants (46.6 ± 4.9 %), maize cob silage (41.2 ± 1.6 %) and maize grain silage (39.7 ± 1.4 %) as compared to maize grain (32.0 ± 1.0 %). Enhanced values of the in vitro ruminal degradability of starch continued to increase until the 24-h of incubation, when the diff erences between silages and maize grain were balanced. A signifi cant diff erence of the curves of degradability profi le was found between silages and maize grain (P < 0.0001) but was not signifi cant between MS, MCS and MGS. maize silage, maize grain, starch; ruminal degradability, in vitro method