Efficacy of supplemental multi-carbohydrases in broiler diets depends on soluble arabinoxylan-to-total arabinoxylan content

Prediction of net energy of feeds for broiler chickens

“…These diets, eventually supplemented with glycine, tryptophan, valine, arginine, isoleucine and leucine in addition to lysine, methionine and threonine, were also adapted to high levels of performance (90 g ADG/bird on average; all values higher than 80 g/bird) that are superior to Aviagen targets ( Aviagen, 2019 ). In agreement with this fast growth, daily N retention (2.9 g/d) was above the values reported in the literature ( McCafferty et al., 2022 ; Musigwa et al., 2021a ; Wu et al., 2019 ) at this stage of growth. In addition, the dietary N was used quite efficiently, since 73% on average was retained by the broilers with maximum values close to 77% for the low CP diets.…”

“…These differences across the studies indicate the possible influence of diet chemical composition and age or genetic background of the animals on energy intake. However, daily HP values of 841 kJ per kilogram BW 0.70 are in line with other studies ( McCafferty et al., 2022 ; Musigwa et al., 2021a ; Wu et al., 2019 ), even though different methods (open circuit vs. closed circuit calorimetry system, age and number of birds, number of measuring days) were used across the studies. Consequently, HI values that were calculated by subtracting FHP values ( Noblet et al., 2015 ) from HP were similar for these studies.…”

“…The HP values in the current study, averaging 50% of AME intake, reflect a minimal loss of energy as HP in broilers. Consequently, RE values also averaged 50% of AME in our trial while lower proportions of AME were retained in most other studies ( Morgan et al., 2019 ; Musigwa et al., 2021a , 2021b , 2021c ; Wu et al., 2019 ).…”

“…Differences in diet composition between studies may then generate differences in AME/GE ratio. Levels and sources of enzyme supplementation may also generate differences between studies for the metabolizability of GE in broilers ( Cerrate et al., 2019 ; Musigwa et al., 2021a , 2021b ; Noblet et al., 2022 ). Additionally, the high N retention coefficient of birds in the present study could also contribute to the higher efficiency of GE for AME.…”

Sex proportion as a covariate increases the statistical test power in growth performance based experiments using as-hatched broilers

“…Experiment 3 was part of the experiment performed and reported by Daneshmand et al [10] aiming to determine the ability of two feed additives to improve performance and intestinal health in broilers challenged with necrotic enteritis. Experiment 4 was part of the experiment performed and reported by Musigwa et al [11] and its aim was to investigate the effect of supplementing multicarbohydrases (MC) to broiler diets containing either low (LS), intermediate (IS) or high (HS) soluble arabinoxylan (sAX) to total arabinoxylan (tAX) ratio (sAX/tAX) on energy partitioning, nitrogen (N) balance, and performance.…”