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AbStr Act : Nutrient digestibility and parameters of nutritive value for ruminants of two winter wheat (Triticum aestivum L.) cultivars were evaluated by means of an in vivo balance trial performed by the regres - sion method on two groups of heifers with an increasing proportion of grain in DM (from 6 to 46%). Sulamit and Rapsodia, chosen on the basis of the in vitro test from a set of 25 cultivars (grown in 2002-2004) reached significant differences in DM fermentability in vitro (by 43.7-78.6 ml/g DM, P < 0.05). In vivo digestibility of crude protein, nitrogen-free extract, organic matter, parameters of N retention, energy concentrations (metabolisable energy, net energy for lactation and for fattening) and parameters in the PDI system (especially PDIE) increased along with the grain proportion in the diet. At the comparable proportion of grain in the ration the positive differences were significantly higher ( P < 0.05) for Sulamit than Rapsodia.

Study of wheat (Triticum aestivum L.) quality for feeding ruminants using in vitro and in vivo methods