The effect of using different concentrations of aqueous nanosuspensions of clay minerals (1%, 1.5%, and 2%) offered at different periods of time (one time per one or two weeks) compared with tap-water with and without antibiotics on growth performance and some selected antibody titer was studied. The experiment lasted from 1 to 36 days of age. The statistical findings of the experiment prove that aqueous nanosuspension 1% offered one time per two weeks significantly improved feed conversion ratio (FCR). Meanwhile, aqueous nanosuspension 2% offered one time per two weeks significantly gave the same effect on live body weight (LBW) and body weight gain (BWG) as did antibiotics. Concerning the findings that pertain to immunity, antibody titer against the most infectious diseases [Newcastle (ND), infectious bronchitis (IB), and infectious bursal disease (IBD)] were significantly improved by offering aqueous nanosuspension 1.5% offered one time per one and two weeks, and aqueous nanosuspension 1% offered one time per one week, respectively.

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