Abstract:
The effect of enzymes supplementation of maize-based and sorghum
based broiler diets on the broiler performance, dry matter digestibility some
carcass quality parameters and blood constitutes were investigated.
A total of 400 one day old broiler chicks were randomly distributed
into 4 dietary treatments (maize based diet with enzymes, maize based diet
without enzymes, sorghum based diet with enzyme and sorghum based diet
without enzymes) in factorial arrangement complete randomized design
experiment (100 birds/treatment).
A multi-enzyme system (Optimize) consisted of phytase and non-starch
polysaccharides (NSP) enzymes (xylanse and β-Glucanase) used in the
broiler diet supplementation with inclusion rate of 1g/kg feed.
Overall performance results showed that the mean live body weight
gain (g/bird) for birds fed enzymes supplemented diets was significantly
(P<0.05) higher compared to unsupplemented diets throughout the
experimental period and the final live body weight followed the same pattern
of weight gain. The total feed intake (g/bird) for birds fed unsupplemented
sorghum based diet was significantly (P<0.05) lower compared to other
dietary treatments. No significant differences among dietary treatment in feed
conversion ratio during the six weeks experimental period, but it tended to
improve for birds kept on enzymes supplemented maize-based diets.
The statistical analysis of the main effects showed that that the
significant (P<0.05) improvement in total weight gain and final live body
weight was due to enzymes supplementation rather than the grain source.
Also it can be seen that the enzymes supplementation caused a significant
(P<0.05) increased in total feed intake (g/bird).
Dry matter digestibility tended to improve for birds fed maize based
diet supplemented with enzymes; however this improvement is statistically
insignificant.
Dressing percentage of birds fed enzymes supplemented diets was
significantly (P<0.05) higher compared to those birds kept on
unsupplemented diets. Meat and fat relative weights showed no significant
differences.
Carcass cuts relative weights showed no significant difference but it
tended to be higher for birds fed enzymes supplemented diets for both grains.
Internal organ (liver, pancreas and spleen) relative weights showed no
significant differences but it tended to be lower for birds fed unsupplemented
sorghum diets.
VIII
Blood glucose, protein, phosphorus, calcium glutamate oxaloacetate
transaminase (GOT) and glutamate pyravate transaminase (GPT) levels were
significantly (P<0.05) affected by the dietary treatments. All these blood
constituents except blood calcium were significantly (P<0.05) affected y the
enzymes supplemented while blood calcium was affected by the grain source.
Sensory evaluation results showed no significant differences, but the
yellowness degree of carcass of birds kept on maize-based diets tended to be
higher
