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Gamma Irradiation Treatment of Cereal Grains for Chick Diets¹

Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Sask., Canada S7N 0W0 ^* Department of Plant Science, University of Manitoba, Winnipeg, Man., Canada R3T 2N2

Wheat (W), triticale (T), hulled barley (HB), hull-less barley (HLB), hulled oats (HO), and hull-less oats (HLO) were gamma irradiated (⁶⁰Co) at 0, 3, 6 and 9 Mrad to study the effect of irradiation on the nutritional value of cereal grains for chicks. A significant curvilinear relationship between radiation dose and 3-wk body weight of chicks fed irradiated cereals was noted for T, HB, HLB, HO and HLO. Chicks fed W or T showed no effect or lower body weight, respectively, while body weights of chicks fed barley or oat samples were higher with irradiation. The improvement tended to be maximal at the 6 Mrad level. Irradiation significantly improved the gain-to-feed ratio for chicks fed either HO or HLO. Apparent fat retention and tibia ash were higher in chicks fed irradiated HLO than in those fed untreated HLO. In a second experiment chick body weight, apparent amino acid and fat retention, tibia ash, and gain-to-feed ratios were lower in chicks fed autoclaved (121°C for 20 min) barley than in those fed untreated barley. Irradiation (6 Mrad) subsequent to autoclaving barley samples eliminated these effects. Irradiation appears to benefit cereals containing soluble or mucilagenous fiber types as typified by ß-glucan of barley and oats. These fibers appear prone to irradiation-induced depolymerization, as suggested by increased ß-glucan solubility and reduced extract viscosity for irradiated barley and oat samples.

KEY WORDS: • cereal grain • irradiation • autoclaving • ß-glucan • nutrient retention • chicks

¹ Funded by the Saskatchewan Agriculture Farmlab program.

Manuscript received 7 June 1985. Revision accepted 22 November 1985.