Abstract
A 6-week study was conducted to evaluate the effect of three different methods for ascorbic acid (AA) supplementation on some productive and physiological performances of laying hens. Eighty ( Each replicate was subdivided into five hens. Control treatment A contained no AA in both basal diet and drinking water. Treatment B contained 1,000 mg AA / kg diet-basal diet and AA-free drinking water. Treatment C contained 500 mg AA/ kg dietbasal diet and 500 mg AA-drinking water. Treatment D contained AA-free basal diet and 1,000 mg AAdrinking water. Body weight gain, feed conversion ratio (FCR), body temperature, total and differential leucocyte counts and heterophils to lymphocytes ratio were investigated. Data were analyzed using analysis of variance (ANOVA) and Duncan's Multiple Range Test. Ascorbic acid supplementation had a significant (p<0.05) positive effect on the body weight gain, body temperature and total leucocytes count compared to a significant (p<0.05) negative effect on FCR. No significant treatment effect shown from supplementation of AA on heterophils to lymphocytes ratio. Ascorbic acid supplementation with feed could improve bird performances under optimum environmental or reduced body temperature.
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