Nutritive and economic values of high oil corn in layer diet

Two layer feeding trials were conducted to demonstrate the nutritive and ec onomic values of recently developed high oil corn (HOC) in Korea. A corn-so ybean meal-based commercial layer diet was chosen as the control diet. The yellow dent corn in the control diet was replaced with HOC to give an isoca loric diet, or replaced with HOC on a 1:1 basis to give a high energy diet, In Trial 1, 510 23-wk-old ISA Brown layers were allotted to three dietary treatments with five replicates per treatment, In Trial 2, 600 38-wk-old Hy -Line Brown layers were allotted to three dietary treatments, again with fi ve replicates per treatment, Both trials were conducted for 15 wk. To measu re the ME values of typical corn and HOC, two metabolism trials were perfor med with layers and adult roosters, The HOC used in this trial contained ap proximately 94% higher crude fat (6.60% as-fed basis) compared with typical corns, The gross energy, AME(n), and TME values of HOC, are 5.7 to 7.7% hi gher than those of typical corns, indicating that the energy use of each co rn were similar. Oil from the HOC contains 6.5 to 8.3% more oleic acid and 6 to 7% less linoleic acid than oil from typical corns. HOC feeding, on an isocaloric basis or on 1:1 replacement with typical corn, did not exert any effect on various laying performances, including the physical quality of e gg. This result reflects the quality of the commercial diet chosen as the c ontrol diet, which was already fairly good, such that the performance was a lready maximal. The polyunsaturated fatty acid content in yolk from hens fe d HOC was higher than that from hens fed typical corns, reflecting higher l inoleic acid content in the HOC. HOC feeding decreased the saturated fatty acid content in the yolk, due primarily to decreased palmitic acid, If used alone replacing typical corn completely in a layer diet, the acceptance pr ice of HOC was estimated to be 154 won/kg when the price of typical corn wa s 131 won/kg (118:100). When both corns were allowed to be used, the accept ance price of HOC increased to 184 won/kg (140:100), indicating that a lot cheaper layer diet can be formulated when both HOC and typical corn are use d in laying hen diet formulation.