Behl C.R., Kaduskar M.R., Thatte V.R. and Khire D.W. (1995). Influence of dietary calcium and ascorbic acid supplementation on the performance of caged laying hens during hot Weather. Indian Vet. J. 72, 586-590.
Borling S., Yi Fu L. and Hsu A. (2002). Studies on dietary calcium requirements of Taiwannative laying hens. J. Taiwan Liv. Res. 35, 273-280.
CelebiS. and BolukbasiS.C.(2006). Influence of supplemental calcium on production parameters and eggshell quality of laying hens in late laying period. J. Anim. Vet. Adv. 5, 340-343.
CostaF.G.P., Oliveira F.L.S., Dourado L.R.B., LimaNeto R.C., CamposM.A.S.F. and LimaA.G.V.O. (2008). Níveis calcium em dietas para poedeiras semipesadas após o pico de postura. Revista Brasileira de Zootecnia. 37, 624-628.
DaghirN.J.(1995). Poultry production in hot climates. Ed.N.J.Daghir, CaB International.
DuncanD.B. (1955). Multiple range and Multiple F Test. Biometrics. 11, 1-42.
El-Gendi G.M., IraqM.M. and Abd El-rahman A.A. (1999). Effect of vitamin C supplementation on some productive and physiological parameters in laying hens. Egypt. J. Nutr. Feed.2 (special Issue), 649-664.
El–Kloub K. and El-Mostafa. M. (2006). Effect of using commercial and natural growth promoters on the performance of commercial laying hens. Egyp. Poult. Sci. 26, 941-966.
EL-Kloub K., EL-Mostafa M. and Abdel-Megeed M.A.A. (2006). Effect of dietary levels of calcium and vitamin D3 and their interactions on the performance of Japanese quail chicks. Egypt. Poult. Sci. 26, 967-989.
El-Sayed N.,Shebl M.K., Magda M.B. and Ksba M.A. (1995). Effect of supplemental biotin on the performance of three lcal strains of chickens and their subsequent progeny growth. Egypt. Poult. Sci.15, 17-42.
Hanaa K.M., Badawy N. and Nosseir F.M. (1992). Dietary calcium effect on certain productive and reproductive traits in coturnix quail II. Egg production, egg quality, fertility and hatchability. Egypt. Poult. Sci.12, 661-677.
Hassan M.S.H., Elsoudany S.M.M. and Roushdy K.h. (2006). Relationship between parathyroid, calcitonin hormones and productive, Physiological and immunological performance of some local strains. Egypt. Poult. Sci.26, 297-317.
Herbert J.A., Daigle J.R. and Barnes D.G. (1977). Dietary calcium and laying hen performance. LouisianaAgric.20, 3-16.
Kuhl H.J., Jr Holder D.P. and Sullivan T.W. (1977). Influence of dietary calcium level, source and particle size a performance of laying chickens. Poult. Sci. 56, 605-611.
Leeson S., Summers J.D. and Caston L. (1993). Response of brown egg strain layers to dietary calcium or phosphorus. Poult. Sci. 72, 1510-1514.
Lim H.S., Namkung H. and Paik I.K. (2003). Effects of Phytase Supplementation on the Performance, Egg Quality, and Phosphorous Excretion of Laying Hens Fed Different Levels of Dietary Calcium and Nonphytate Phosphorous. Poult. Sci. 82, 92-99.
Mohammed T.A. and Mohammed S.A. (1991). Effect of dietary calcium level on performance and egg quality of commercial layers reared under tropical environments. World Rev. Anim. Prod. 26, 17-20.
Pakdel M., Pourreza J. and Ansari S. (2003). Effects of different l-evels of dietary calcium and available phosphorus on the per-formance of lsfahan native breeder hens. J. Sci. Technol. Agric. natural Resources. 7, 163-172.
Pizzolante C.C., Garcia E.A., Laganá C., Saldanha E.S.P.B., Deodato A.P., Faitarone A.B.G., Scherer M.R. and Batista L. (2006). Effect of the calcium level and limestone particle size on the performance of semi-heavy layers in the second cycle of egg production. Brazilian J. Poult. Sci. 8, 173-176.
Saleh K. and El-NaggarN.M.(1983). The effect of breed and diet- ary calcium levels on the performance of laying hens under subtropic conditions. Agric. Res. Rev. 61, 125-143.
SAS institute. (2001). SAS User's guid: Statistics, Version 10th Ed. SAS institute Inc., CaryNC.
Sunder G.S., Pandey N.K. and Sadagopan V.R. (1990). Effect of dietary calcium and phosphorus levels on production parameters and egg quality traits of white leghorn layers fed inactive dry yeast. Indian J. Anim. Sci. 60, 350-354.