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RESEARCH ARTICLEcontaining phytase as the only component. The fivetreatments are as follows.T1 - Birds fed with Standard layer diet.T2 - Birds fed with Low available phosphorusLayer ration (0.3 percent)T3 - T2 + 200 units of PhytaseT4 - T2 + 300 units of PhytaseT5 - T2 + 400 units of PhytaseFeed and water were provided ad libitum.Egg weight , egg shell thickness, egg shell weightand egg specific gravity were recorded at the end ofeach 28-days period with 4 eggs randomly selectedfrom each replicate for three consecutive days. Eggshell thickness was measured using shell thicknessmeasure gauge and egg specific gravity wasobtained by Brain floatation technique developedby Tyler and Geake (1961).RESULTS AND DISCUSSIONMean egg weight, egg shell thickness, eggshell weight and egg specific gravity as influencedby phytase supplementation is given in Table.2 andFig 1 . Perusal of mean egg weight data indicatedthat birds fed a low available phosphorus layerration (Table 1) without enzyme (T2) laid eggs withsignificantly (p