Feeding investigations were carried out on Pekin ducks breed reared up to 56 days of age under generally use technological principles, in four groups (100 birds each). Till 3 weeks oi age the ducks were fed mixed fodder with 25% share of barley in I treatment, and the same share of oat in II treatment. From 4th to 8th week of age, the ducks were additionally divided to 2 subgroups (A and B). Birds from A-subgroups were still fed complete diets with 70% share of barley or with 50% share of oat. Grain was picked up from fields, which were nitrogenous fertilized {levels from 60 to 150 kg/ha). Birds from I group (control) were fed grain not fertilized with nitrogen, while the others received: II group - 60 kg. III group - 120 kg and IV group - 150 kg/ha. The only source of protein for ducks from B-subgroups were barley and oat in complete diets with 86% and 85%. amount of seed, respectively. The evaluation of the feeding value of barley and oat for nutrition was performed on the base of body weight grain, feed conversion, health state of ducks, carcass dressing percentage and meat quality. It has been stated, that nitrogenous fertilization of barley and oat with rations 120kg and 150kg/ha influenced insignificantly on increase of crude protein level (about 1,5%) in studied grain, slightly improved digestibility of protein and crude fat, increased percentage of retained to consumed nitrogen and content of dry matter and protein in meat, amino acid level (exept tyrosine) in oat decreased simultanously. Productive results and health state of ducks did not allow to draw univocal conclusions of either negative or clearly positive influence of nitrogenous fertilization of barley or oat (with rations from 60 to 150 kg/ha) on the feeding value of these coreals in nutrition of duck brodlers.
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