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¹ Kuzey Anadolu Kalkınma Ajansı 37000 Kastamonu
² Ankara Üniversitesi Ziraat Fakültesi Zootekni Bölümü 06100 Dışkapı Ankara - In this study, the effect of using gamma irradiated barley and wheat (0, 10 and 100 kGy) and enzyme supplementation on the intestinal viscosity, microflora and radioactive contamination of eggs was examined. In this experiment 36 weeks old, 324 Brown Nick laying hens were used for ten weeks. The study was a randomized complete block design with 9 dietary treatments within 6 blocks of 54 pens each 6 birds per pen. Intestinal microflora was not affected by the treatments. Intestinal viscosity was significantly decreased in birds fed with wheat, especially 100 kGy gamma irradiation (P<0.05). The intestinal microflora examined in the experiment was not significantly affected by gamma irradiation and enzyme supplementation. There was no radioactive contamination both in feeds and eggs under 10 and 100 kGy gamma irradiation of barley and wheat. Keywords : Laying hens, gamma irradiation, enzyme, wheat, barley