Abstract
The aim of a growth model experiment in laboratory rats was to check the nutritive value of the set of newly bred spring barley lines with different grain characteristics. The followed set contained feed type hulless lines bred in the Agricultural Research Institute Kroměříž , Ltd. KM1771 (1), KM 1057 (2), food type hulless lines KM 2082 (3), KM 2092 (4), KM 2062 (5) and lines formed on the basis of crossing with food donors of a waxy endosperm type – hulless line Wabet x Washonubet (6), hulled line Wabet x Krona (7) and Wabet x Kompakt (8). The line Kompakt x Krona (9) and the malting variety Nordus were used as a control (10).The best results of an average daily gain and feed conversion ratio (FCR) (9.19 g; 2.29) were achieved by feeding the line KM 1057 (2), conversely, the worst by feeding food barley of the waxy type (average daily gain in animals of experimental group 6 was only 8.01 g and FCR 2.54). This material also had the highest β-glucan content (7.1 %) out of the followed set. The lowest β-glucan content was detected in the sample 9 (3.88 %). Linear dependence between intake of β-glucans (x) and cholesterol content in rat´s blood (y) was: y = -0.0591x + 3.8102, R2 = 0.4681. The found dependence was statistically highly significant (PThe highest values of digestibility coefficients of crude protein (75.96 %) and crude fibre (49.63 %) were measured in animals in a group 2, on the contrary the lowest digestibility of crude fibre (31.10 %), fat (56.96 %) and ash (45.65 %) was exhibited by a control group 10. Differences in digestibility of all followed nutrients after the 14th day and at the end (28th day) of the experiment were observed (crude protein digestibility was lower by 5.65 %, ash digestibility by 11.47 %, fibre by 10.85 % and fat by 3.75 %).It was confirmed that the tested waxy lines exhibited hypocholesterolemic effect; we, however, do not recommend them for feeding of monogastric animals due to high β-glucan content, reduced intake of mixture and impaired feed conversion.
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