Özet:

investigate the effects of supplemental methionine and magnesium on egg production and quality in laying hens. Twenty eight-week old 120 laying hens (Bowans) were divided into 4 groups each containing 30. The hens were fed either a basal diet or basal diet supplemented with 300 ppm magnesium, 1% methionine, or 300 ppm magnesium + 1% methionine. Live weight changes were similar between groups (P >0.05). Similarly, feed intake (P > 0.05), feed efficiency (P > 0.05) and egg production (Hen-day) (P > 0.05) between groups were similar. Supplementing methionine or magnesium to laying hens did not change egg weights (P > 0.05). Egg shell thickness was greater in eggs from hens fed a combination of methionine and magnesium compared with that of other groups (P ≤ 0.01). Because albumin width did not change (P > 0.05) albumin index remained similar among treatments (P > 0.05). Haugh unit remained similar among treatments (P > 0.05). Except serum phosphorous concentrations, serum parameters measured in this study (Ca, Mg, protein, cholesterol, triglyceride, and glucose) upon methionine and magnesium supplementation remained similar among treatments (P > 0.05). In conclusion, greater magnesium and methionine concentrations in the diet of laying hens than National Research Council recommendations did not result in improvement in live performance and egg production and quality

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