Abstract
An experiment was carried out to investigate the effect of multi-enzyme in high and low levels of metabolizable energy (13.81 and 11.51 MJ kg -1 diet) on performance and energy utilization of broilers fed wheat-soybean meal diets from 0 to 21 days of age. Result showed that birds fed diets containing 11.51 MJ kg -1 consumed significantly (p < 0.05) more feed than diets containing 13.81 MJ kg -1 , whereas daily gain and feed conversion ratio improved (p < 0.05) when enzyme was added to 11.51 MJ kg -1 diet. There was significant improvement in metabolizable energy, net energy for production, organic and dry matter digestibility in 0-21 when diets supplemented with enzyme (p < 0.05). Addition of enzyme to 11.51 MJ kg -1 containing diet significantly (p < 0.05) reduced heat production of birds in 0-10 d, whereas heat production was not changed in 21 days. Supplementation of 11.51 MJ kg -1 diet with enzyme improved the efficiency of ME use for carcass energy and protein retention of broilers (p < 0.05). Generally, the results of current study demonstrated that addition of enzyme to wheat-soybean diets improved NEp of broiler chickens while MEI was not changed and it seems NEp is a more sensitive energy utilization response criterion to use in evaluating broilers response to enzyme supplementation.
Highlights
Anti-nutritional compounds known as non-starch polysaccharides (NSPs) are the most important factor has confined feeding wheat to broiler chickens especially at early days of growing period
Some reports indicate that enzyme supplementation is more effective in younger broiler chickens, which is may related to inefficient production of endogenous digestive enzymes at this period (Almirall, Francesch, PerezVendrell, Brufau, & Esteve-Garcia, 1995)
Birds fed 11.51 MJ kg-1 diet without enzyme supplementation, had the poorest (p < 0.05) feed conversion ratio (FCR) and there was no significant difference among other treatments in 0-21 d (p > 0.05)
Summary
Anti-nutritional compounds known as non-starch polysaccharides (NSPs) are the most important factor has confined feeding wheat to broiler chickens especially at early days of growing period. Supplementation of wheat-based diet with exogenous glycanase appear to enhance growth performance and energy utilization alongside with (Hashemipour, Khaksar, Rubio, Veldkamp, & Van Krimpen, 2016; Kiarie, Romero, & Ravindran, 2014; Pirgozliev et al, 2015; Wu, Choct, Wu, Liu, & Swick, 2017) or without reduction of intestinal viscosity of broilers (Amerah, Ravindran, Lentle, & Thomas, 2008). Olukosi, Cowieson, and Adeola (2008) demonstrated that broiler chickens benefited more from enzyme supplementation at younger age and contribution of the enzymes to nutrient retention reduce with age in chickens. Another key factor for rapid growth of broiler chickens that promote enzyme effects is energy concentration of diet. Many researchers noted that improvement occurred in metabolizable energy (ME) availability with enzyme supplementation is greater at low-energy diet compared to high-energy food (Cho, Zhao, & Kim, 2012; Gitoee, Janmohammadi, Taghizadeh, & Rafat, 2015; Zhou, Jiang, Lv, & Wang, 2009)
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