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This research was conducted within the period 2011-2013 in the Department of Plant-growing experimental facility at the Agricultural University of Plovdiv (Bulgaria). The method of fractional plots in three repetitions over an area of 10.5 m² was used. The object of this research are eight winter oat genotypes (Avena sativa L.) - № 1, 07/Z 1, Dunav 1, 08/Z 2, M-K, Kt 651, Ressor 1 and line Kt 718. The aim of the study is to establish the correlations between the studied genotype grain yield and some of its quality indicators. A genotype specificity of the correlative interconnections has been determined. For Dunav 1 and line 07/Z 1 those between yield and 1000-grain weight are medium to strongly positive. Line 08/Z2 is with small grain but high quantity of beta-glucans (4.6%). The correlative interconnections of this indicator for yield and 1000-grain weight are positive. Line Kt 718 has also got potential in terms of grain weight (1000-grain weight - 28.7 g) and beta-glucan content (3.75%). The correlation between them is positive. [ABSTRACT FROM AUTHOR]