Effects of Multi-Enzymes on Growth Performance, and Effects of Multi-Enzymes and Probiotics on Nutrient Utilization in Broilers Fed Different Level of Fibers

Abstract

The overall objective was to examine the effect of multi-enzymes on growth performance and that of multi-enzymes and DFM on apparent ileal (AID) and apparent total tract digestibility (ATTD) of nutrients in broilers. Two independent studies were conducted for 21 d with Cobb 500 broilers fed low, and high fiber diets. In growth study, a 2×2 factorial design (2 level fiber and 2 supplements: none or xylanase, amylase, and protease; XAP) with 8 replicate floor pens (8 birds/pen; in two batches) was used. The digestibility study was conducted in a 2×4 factorial design with 8 replicate cages (6 birds/cage; in two batches). Each fiber level diet was supplemented 1) none (control), 2) XAP, 3) DFM or 4) XAP+DFM. In study 1, in 21 d period, the high fiber increased FCR (P < 0.05) by 0.04 units compared with low fiber. The XAP supplementation increased ADG by 12% and reduced FCR by 0.09 units compared with the control (P < 0.01). In study 2, the high fiber decreased (P < 0.05) AID and ATTD of dry matter (DM), crude protein (CP), gross energy (GE) and starch, and ATTD of total NSP and nitrogen corrected apparent metabolizable energy (AMEn). The high fiber decreased (P <0.01) AID of all amino acids except AID of lysine, glutamine, phenylalanine and glycine. The combination of XAP and DFM increased (P <0.01) total tract NR and AMEn as well as the AID and ATTD of DM, CP, GE, starch and total NSP while the individual supplements had intermediate effects. The combination increased (P <0.05) the AID of isoleucine, phenylalanine, threonine, cysteine, and tyrosine. The results suggest that the multi-enzymes can improve the performance of birds raised on fibrous diets while its combination with DFM can produce enhanced improvement in digestibility of nutrients than their single use.