The effects of xylanase supplementation on production performance, carcass traits, caecal
volatile fatty acid and peptide YY concentration in serum of broiler chickens fed
maize–soybean based diets were tested in a 42 d experiment. Dietary metabolizable energy
(AME, N uncorrected) was decreased in the experimental diets by 0 (E1), 230 (E2) and
420 kJ/kg (E3). Each of these diets was supplemented with 0 (X1) or 16,000 units/kg (X2) of
a commercial xylanase. The objective was to ascertain if the xylanase could spare dietary
energy for growth through its effects on peptide YY concentration in blood. Reduction
of dietary AME depressed body weight gain (P=0.014), deteriorated feed conversion ratio
(P=0.018) and decreased carcass yield (P=0.0001) over 42 d. Irrespective of the level of
supplemental xylanase, breast meat yield was the poorest in the E2 groups (P=0.003).
Supplementation of xylanase had no effect on body weight gain, feed consumption, feed
conversion ratio (feed consumption: body weight gain) and carcass traits (P>0.05). Low
energy diets increased total volatile fatty acids (VFA) in caeca (P=0.0001). Xylanase supplementation
tended to decrease caecal VFA irrespective of dietary AME (P=0.07). Increasing
dietary AME reduced Salmonella (P=0.018) and Escherichia coli (P=0.019) and increased
Enterobacteriaceae (P=0.012) populations in caeca. Reduction in dietary AME decreased glucose
(P=0.0001) and cholesterol (P=0.012) in serum, particularly in the E3 groups. Serum
glucose increased due to xylanase supplementation in the E1 and E3 groups but not in
the E2 group (energy
×
xylanase P=0.0001). Supplementation of xylanase to the E2 groups
decreased serum cholesterol as compared with the E1 and E3 groups (energy
×
xylanase
P=0.002). On the other hand, xylanase supplementation decreased serum concentrations
of protein in the E1 and E2 groups (energy
×
xylanase P=0.0001) and uric acid in the E2 and E3
groups (energy
×
xylanase P=0.006). Serum insulin reached a maximum (P=0.0001) in the
E2 group irrespective of xylanase supplementation and added xylanase increased serum
insulin (P=0.0001) at all dietary AME levels. There was an interaction between dietary
AME and supplemental xylanase on serum peptide YY concentration (P=0.0001) which
suggested that the xylanase induced increase in the serum peptide YY concentration was
dependent on dietary energy density. It was concluded from the present investigation that
The effects of xylanase supplementation on production performance, carcass traits, caecalvolatile fatty acid and peptide YY concentration in serum of broiler chickens fedmaize–soybean based diets were tested in a 42 d experiment. Dietary metabolizable energy(AME, N uncorrected) was decreased in the experimental diets by 0 (E1), 230 (E2) and420 kJ/kg (E3). Each of these diets was supplemented with 0 (X1) or 16,000 units/kg (X2) ofa commercial xylanase. The objective was to ascertain if the xylanase could spare dietaryenergy for growth through its effects on peptide YY concentration in blood. Reductionof dietary AME depressed body weight gain (P=0.014), deteriorated feed conversion ratio(P=0.018) and decreased carcass yield (P=0.0001) over 42 d. Irrespective of the level ofsupplemental xylanase, breast meat yield was the poorest in the E2 groups (P=0.003).Supplementation of xylanase had no effect on body weight gain, feed consumption, feedconversion ratio (feed consumption: body weight gain) and carcass traits (P>0.05). Lowenergy diets increased total volatile fatty acids (VFA) in caeca (P=0.0001). Xylanase supplementationtended to decrease caecal VFA irrespective of dietary AME (P=0.07). Increasingdietary AME reduced Salmonella (P=0.018) and Escherichia coli (P=0.019) and increasedEnterobacteriaceae (P=0.012) populations in caeca. Reduction in dietary AME decreased glucose(P=0.0001) and cholesterol (P=0.012) in serum, particularly in the E3 groups. Serumglucose increased due to xylanase supplementation in the E1 and E3 groups but not inthe E2 group (energy×xylanase P=0.0001). Supplementation of xylanase to the E2 groupsdecreased serum cholesterol as compared with the E1 and E3 groups (energy×xylanaseP=0.002). On the other hand, xylanase supplementation decreased serum concentrationsof protein in the E1 and E2 groups (energy×xylanase P=0.0001) and uric acid in the E2 and E3groups (energy×xylanase P=0.006). Serum insulin reached a maximum (P=0.0001) in theE2 group irrespective of xylanase supplementation and added xylanase increased seruminsulin (P=0.0001) at all dietary AME levels. There was an interaction between dietaryAME and supplemental xylanase on serum peptide YY concentration (P=0.0001) whichsuggested that the xylanase induced increase in the serum peptide YY concentration wasdependent on dietary energy density. It was concluded from the present investigation that
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