Effect of different sources of dietary fibre on nutrient and energy utilization in broilers: 1. Characterization of the diets, growth performance and nutrient utilization
Hadorn, R.; Wenk, C.
Archiv fuer Gefluegelkunde 60(1): 14-21
Various sources of dietary fibre (millet and soybean hulls) as well as wheat starch were tested for their influence on nutrient and energy utilization in broilers. Twenty percent of the control diet (KO) were either replaced by wheat starch (20% STA), millet hulls (20% HI) or soybean hulls (20% SO). In two consecutive series of experiments, the experimental diets were fed ad libitum to 192 male chickens of Ross hybrid from day 8 to day 42. The addition of starch or millet hulls led to a five-percent decrease in daily weight gain, whereas in diet 20% SO, the corresponding value was lowered by 15%. All supplementations to the control diet were followed by a higher feed consumption (20% HI: +17%; 20% SO: +9%; 20% STA: +7%). Water consumption per unit feed of 20% SO broilers was enlarged by 22-30% and correlated (r = 0.72) with the content of soluble dietary Fibres (LNF). The lowest dry matter content (TS) in excreta resulted in diet 20% SO (28.3%) and the highest in diet 20% HI (37%). NDF digestibility depended significantly on its dietary content (r = -0.87). Hull addition impaired dietary content of metabolizable energy (ME) by 2.1 MJ/kg DM. Therefore dietary ME content decreased with higher contents of dietary fibre (r = -0.93). In comparison to the insoluble fibre fraction (UNF), the influence of variations in LNF on ME content in the diet was enlarged by eight times. A lowered ME content in the diet would have been partly compensated with an increased feed consumption, if no physical satiety due to a high LNF content have occurred. LNF also influenced ME intake negatively (r = -0.54), which was followed by decreased weight gain (r = 0.78).