The influence of dietary rice bran with phytase supplementation on growth performance of growing Muscovy ducks

الملخص EN

The purpose of the current study was to assess the effect of rice bran (RB) inclusion with phytase supplementation as a possible feed ingredient in growing Muscovy ducks.

One hundred Sixty two 1-day-old males Muscovy ducklings were used to evaluate the effect of using rice bran on growth performance nutrients digestibility, some carcass traits, some plasma constituents and economic efficiency.

The effect of RB per se was recognized compared with the control group.

The data of final body weight revealed that there were insignificant different among the experimental groups where, ducks fed 0.0% RB surpassed the other treated groups.

Ducks fed 60% RB had the lowest body weight by 5.7% followed by birds fed 30% RB (2.4%) compared to the control.

The same direction was observed with body weight gain.

Statistical differences were noticed with feed conversion ratio between treated groups.

The rice bran containing diet (60%) increased feed conversion ratio by 14.2% compared to the control.

Final body weight increased significantly with dietary phytase supplementation by (3.4%) compared to the un-supplemented diet.

Growth rate value was increased significantly with phytase supplementation by 4.6% compared to the un-supplemented diet.

Rice bran and phytase supplementation interacted significantly to affect all performance parameters except feed intake.

Phytase supplementation increased dry matter (4.58%), CP (4.32%), EE (2.61%), NFE (4.16%), CF (7.14%), and ME (4.15%) compared with control.

Linear relationship can be noticed between RB and small intestine (%).

The abdominal fat % decreased by 16.7 % with 60% followed by 6.6% with 30% RB compared with the control.

Ducks fed phytase possessed significantly the highest dressing (1.2%), GIT (5.66%), small intestine (3.65%), and pancreas (4.22%) compared with the control.

Dietary rice bran and phytase interacted significantly to influence all investigated carcass traits except giblets and abdominal fat.

Liner relationship was observed between RB inclusion diets and glucose where increasing RB levels from 0 to 60% leads to decrease glucose level by 17.32%.

Glucose, total lipid and cholesterol responded linearly where they decreased with phytase supplement.

Glucose decreased by 12.6, total lipid decreased by 7.0% and cholesterol decreased by 3.5%.

Rice bran inclusion interacted significantly with phytase supplementation.

Significant differences among treatments groups can be noticed in EE where ducks fed 60% rice bran was significant higher by 5 % than those fed the control diet while EE in ducks fed 30% rice bran increased numerically by 4% than those fed the control.

The economic study showed that lower total feed cost was noticed with 60% RB with phytase.

It can be concluded that rice bran with microbial phytase could be used up to 60% in Muscovy ducks diets without any harmful effect on performance and economic efficiency.