Performance, bone characteristics, and physiological parameters of broilers fed nutrient-restricted diets supplemented with multicarbohydrase complex associated with high levels of phytase

• Published in: Journal of applied poultry research 2021-06, Vol.30 (2), p.100141, Article 100141
• Main Authors: Sangalli, G.G., Eyng, C., Spindola, M., Nunes, R.V., Broch, J., Lenhardt Savaris, V.D., Rohloff, N., Köhler, T.L.
• Format: Article
• Language: English
• Subjects: bone density; bone mineralization; morphology; phytate; xylanase
• ISSN: 1056-6171; 1537-0437
• DOI: 10.1016/j.japr.2021.100141

An experiment was conducted to evaluate high doses of phytase associated with multicarbohydrase complex in diets with a nutritional reduction on feed cost, performance, intestinal morphometry, digesta viscosity, blood and bone parameters, and carcass yield of broilers. For this purpose, 1,540 1-day-old male broiler chicks were distributed in a completely randomized design with 5 treatments, with 14 replicates and 22 birds each. The treatments consisted of the following: positive control (PC), a diet meeting the nutritional requirements without enzymes; negative control (NC), a PC diet with a reduction of 100 kcal/kg AME, 0.15% available P, 0.12% Ca, 4% digestible lysine, and 5% Na; NC diet + multicarbohydrase complex (MCC) + phytase at 3 levels (1,000, 1,500, and 2,000 FTU/kg). The results demonstrated that the use of phytase associated with MCC in nutrient-restricted diets maintained broiler performance in the prestarter phase. From 1 to 42 d, broilers fed enzyme-supplemented diets had a better performance than those receiving nutrient-restricted diets without enzymes. The different levels of phytase associated with MCC affected the serum biochemical parameters of broilers; however, these modifications did not influence bone characteristics. The mode of action of enzymes is substrate-dependent, which may have limited enzyme activity. As a result, no improvements in carcass yield or intestinal and bone parameters were observed. It is concluded that diets with nutritional reduction and addition of 1,000 FTU/kg phytase in association with MCC maintain the performance and is a feasible strategy to reduce feed cost.