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Productive PerformanceType of cereal did not affect productive performanceof the hens, which agrees with data of Liebert et al.(2005) comparing corn and soft wheat in LohmannBrown hens from 22 to 61 wk of age and with Lillieand Denton (1968) in SCWL hens fed diets from 20 to68 wk of age. Similarly, Ouart et al. (1986) indicatedthat egg production, egg weight, ADFI, and FCR ofSCWL hens from 68 to 71 wk of age were not affectedwhen 37% corn was substituted by soft wheat. Moreover,Lázaro et al. (2003a) reported no differences inany productive trait when 50% corn was substitutedby soft wheat in diets for SCWL hens from 20 to 44wk of age. Similarly, Çiftci et al. (2003) did not observeany effect on productive performance when 30% cornwas substituted by wheat in diets for SCWL hens from27 to 43 wk of age. However, Kim et al. (1976) foundthat SCWL hens fed a diet based on corn consumed more feed and produced bigger eggs than hens fed dietbased on soft wheat from 21 to 43 wk of age, althoughBW and egg production were not affected. We havenot found any research comparing the effects of cornand durum wheat on productive performance of layinghens. Afsharmanesh et al. (2008) designed diets containing80% of either soft wheat or durum wheat forbroilers from 1 to 21 d of age and did not find any differencein productive performance. In the current trial,the 2 basal diets (durum wheat and corn) were isoenergetic(2,750 kcal of AMEn/kg) according to FundaciónEspañola Desarrollo Nutrición Animal (2003). Thus, nodifference in ADFI because of the energy concentrationof the diets was expected.
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