Investigation of the effect of Primalac probiotic and Fermacto prebiotic on growth performance and carcass quality of broilers

The current study was aimed to investigate the effect of Primalac probiotic, Fermacto prebiotic and their composition on growth performance, carcass quality and decreased requirements of protein and energy in broilers diets. A number of 720 one day male and female Cobb 500 chicks were allocated to 6 treatments with 4 replications and 30 chicks for each replication, under a completed randomized design. Treatments were consisted of A: control (without the additives); B: control+ recommended level of Primalac in each growth stage; C: control+ recommended level of Fermacto in each growth stage; D: control+ 50% of recommended level of Primalac+ 50 % of recommended level of Fermacto in each growth stage; E: control+0.5% lower protein+50 kcal/kg lower ME+ 50% of recommended level of Primalac and Fermacto in each growth stage; and F: control+1% lower protein+100 kcal/kg lower ME+ 50% of recommended level of Primalac and Fermacto in each growth stage. No significant difference did exist (P>0.05) among various treatment for body weight gain, feed intake, feed conversion ratio, carcass relative weight, and percentage of carcass, leg, breast, heart, small intestine, abdominal fat, spleen and bursa of fabricius. Treatments E and F, in spite of lower level of dietary protein and energy, had similar performance with other treatments. Therefore the influence of probiotics and prebiotics appears when the diet nutrient content or its availability is restricted.