Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2012.553.560LampromsukPiya BunchasakChaiyapoom KaewtapeeChanwit SawanonSuriya PoeikhamphaTheerawit 62012126One hundred and twenty piglets (body weight~7.24 kg, weaned at 24 day of age) were divided into 3 groups with 10 replication of 4 piglets in a completely randomized design. There were 3 feeding consisted; phase I (24-31 days), phase II (32-45 days) and phase III (46-73 days). The diets were divided into 3 treatments by adding 2, 300 ppm of zinc oxide in phase I to II (T1), adding 500 ppm of zinc acetate in phase I to II and plus 3,000 ppm of sodium benzoate based acidifier in all phases (T2) and by adding 500 ppm of zinc acetate in phase I to II and plus 3,000 ppm of formic acid based acidifier in all phases (T3). The results indicated that replacing zinc oxide (T1) by zinc acetate in phase I to II and plus sodium benzoate based acidifier in all phases (T2) significantly increased final body weight, body weight gain (p<0.05) and slightly improved FCR (p>0.05) while feed consumption was not significantly influenced by all dietary treatments. Moreover, the dietary treatments did not affect to intestinal pH, bacteria population and volatile fatty acids in the caecum of pigs. In term of morphology of absorptive cells, the supplementing zinc acetate in phase I to II and plus sodium benzoate based acidifier in all phases (T2) significantly increased villous height in jejunum and ileum (p<0.01), villous width in ileum (p<0.01) and crypt dept in jejunum (p<0.01) compared to T1 and T3. 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