| Abstract: | Two experiments using commercial incrossbred pullets, 22 weeks of age, were conducted. In experiment No. 1 the results on performance of two levels of added choline chloride (400 and 1600 Gms/ton), B₁₂ (4 and 16 milligrams/ton) and vitamin E (4,000 and 16,000 I.U./ton) were compared. In experiment No. 2 the availability of lysine from opaque-2 corn was compared with a synthetic source. Two lysine levels were superimposed upon three cereal grain sources: (1) a commercial red grain sorghum; (2) a specially bred milo supplied by a certified breeder; and (3) a commercially available yellow corn. The two lysine levels were 0.45% which is slightly below the NRC recommended level of lysine for laying hens and 0.50% which is the NRC stated requirement. The increase from 0.45% to 0.50% was brought about by supplementation with opaque-2 corn and with a synthetic lysine. A positive control diet containing 0.76% lysine was used for checking adequacy of 0.50 lysine. ... |
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