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This research examined the inspiration of different proportions of large and small particles of limestone on egg production, eggshell quality and breaking strength of tibia from 32 to 44 weeks of age in Golden Montazah layers diets . Chickens were randomly allocated to four groups 32 pullets per group were divided into four replicates. Limestone consisting of fine (F > 0.6 mm) and large (L>2.8mm -4.5mm). All chickens obtained a basal diet of the similar formula. Variations between four equal groups depends on the ratio of fine pulverized limestone by larger particle size limestone . Significantly higher eggshell breaking force (31.69N), shell weight (5.65 g), and shell thickness (0.46 mm) were obtained for eggs from the fourth treatment of hens than (29.46 N; 5.33 g ; 0.37mm respectively) for eggs from the control group. Tibia breaking strength was significantly higher for the fourth group (350.66 N) vs. (252.82 N) respectively than those in control group. The conclusion of our study present some chances of eggshell quality enhancement by the use of larger limestone particles as a Ca supplement in layer diets. From 60% to 100% replacement of small size by large particle of limestone given helpful results on eggshell and tibia bone qualities.

egyptian poultry science

EFFECT OF VARIOUS PROPORTIONS OF LARGE AND SMALL PARTICLES OF LIMESTONE ON EGG PRODUCTION, EGGSHELL AND BONE QUALITIES AT THE PEAK OF EGG PRODUCTION IN GOLDEN MONTAZAH CHICKEN