Abstract
This study was conducted to investigate the effect of dietary supplementation of exogenous multi-enzyme complex and feed form on growth performance, slaughter characteristics, nutrient digestibility, phosphorus (P), calcium (Ca), and nitrogen-corrected apparent metabolizable energy (AMEn) utilization in broilers fed corn–soybean meal diets. A total of 312 male one day-old broiler chicks (Ross 308) were allocated to 6 dietary treatment groups with 13 replicates (4 birds each) in a 2×3 factorial arrangement of treatments in a randomized design, which includes mash (M) or pellet (P) diets supplemented with three levels of a multi-enzyme complex (0, 125, or 175 mg/kg) for 42 days. The results indicated that the addition of 175 mg/kg multi-enzyme complex to pelleted feeds (P175) significantly increased (p<0.05) the body weight and feed intake of the broilers during the grower period. The feed conversion ratio (FCR) was significantly improved (p<0.05) by adding the multi-enzyme complex to the pelleted feeds. The feed form * multi-enzyme interaction was significant on d0-21 for BW and FI and all three periods in FCR (p<0.05). Mash feed decreased the European Production Efficiency Factor (EPEF) ratio compared to that of the pelleted feed, and it was observed that EPEF increased (p<0.05) linearly with an increase in the multi-enzyme complex added to both the mash and pelleted feeds. Although there was no difference among the groups regarding the carcass yield and relative organ weights, the gizzard weight increased significantly in chickens fed with mash feeds (p<0.05). In addition, the difference between treatment groups in terms of total tract nutrient digestibility does not differ (p>0.05) significantly, while the highest (p<0.05) AMEn utilization was found in the P175 group. As a result, the pelleted feed form and the increased level of multi-enzyme supplementation improved the performance and efficiency of broiler production.
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