The aim of the study was to determine the effect of two different acidificants on the growth pattern of piglets during the period from weaning until the attainment of 30 kg body weight. A total of 336 pigs were included in the study, divided in two equal groups (Fra Acid, n=168; Acidad Dry®, n=168). On the basis of weaning weight, piglets were divided into “light” (L = 6 kg) and “heavy” (H = 8 kg) groups. Two acidificants, which varied in organic acid content, were used in the piglet diets. Feed was supplemented with Fra Acid at a concentration of 0.65, 0.60 and 0.40 %. The second supplement, Acidad Dry®, was added at concentrations of 0.35, 0.30 and 0.20 %. Piglets were individually weighed at weaning, on the 23rd day of age and again each time the feed was changed (at days 35, 49 and 82 of age). The experimental groups did not differ significantly in body mass during the experimental period. Piglets with Acidad Dry® achieved higher daily gains than piglets fed with Fra Acid, but again, the relationship was not statistically significant. “Heavy” piglets in the Acidad Dry® supplemented treatment had significantly higher daily gains in the period from 49 to 82 days of age in comparison to those in the Fra Acid treatment (567 ± 80g; 507 ± 140 g, p=0.044).Cilj rada bio je odrediti djelovanje dvaju različitih acidifikanata na rast praščića u razdoblju od odbica do postizanja tjelesne mase od 30 kg. U istraživanje je bilo uključeno 336 svinja podijeljenih u dvije jednake skupine (Fra Acid, n = 168, Acidad Dry K n = 163). Na temelju tjelesne mase pri odbiću praščići su podijeljeni u "laku" (L = 6 kg) i "tešku" (H = 8 kg) skupinu. U obrocima praščića upotrijebljena su dva acidifikanta različitog sadržaja organske kiseline. U hranu je dodavan Fra Acid u koncentraciji od 0,65, 0,60 i 0,40%. Drugi dodatak, Acidad Dry K, dodavan je u koncentracijama od 0,35, 0,30 i 0,20%. Praščići su pojedinačno vagani pri odbiću, zatim 23. dana starosti i opet svaki puta kad je promijenjena hrana (35., 49. i 82. dan starosti). Pokusne skupine nisu se značajno razlikovale u tjelesnoj masi za vrijeme pokusa. Praščići s Acidad Dry K postigli su veće dnevne priraste od praščića hranjenih s Fra Acidom, ali povezanost nije bila statistički značajna. "Teški" praščići u tretmanu s Acidad Dry K imali su značajno više dnevne priraste u razdoblju od 49. do 82. dana starosti u odnosu na one u Fra Acid tretmanu (567± 80 g, 507± 140 g, p = 0.04)
