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Determinig lysine requirement of Laying hen during peak egg production

This study was conducted to determine lysine requirement of laying hen during peak egg production from 26 to 42 weeks. of age. The basal diet used was based on corn- corn gluten meal- soybean meal and contained 0.58% lysine. To the basal diet nine graded Levels of Lysine (0.04, 0.08, 0.12, 0.16, 0.2, 0.24, 0.28, 0.32, 0.36%) were added. The experimental diets were fed for 16 week. Each experimental diet was fed to 48 Laying hen in a randomized complete design with 4 replicate for each treatment. Broken-line and exponential models were used for estimation of lysine requirement.Dietary lysine levels had a significant effect on egg weight,egg mass output,feed intake(p< 0.01) and feed converstion ratio(p< 0.05) but hadnot signifcant effect on egg production .Based on egg mass output response and the fit of Broken-line and Exponential models the requirement for total lysine were estimated 645 and 710 mg per hen - day; respectively. Based on feed conversion efficiency Response and the fit of Broken- line and Exponential models the requirement for total lysine were estimated 750 and 810 mg per hen- day. In conclusion, the results of this experiment indicated that daily lysine requirement of laying hen during peak egg production was estimated 810 mg per her- day or 53 gram per kilograme of dietary crude protein.