Digestive physiology of on-growing common dentex (
Dentex dentex
), including protease, amylase and lipase
activity in stomach, pyloric caeca, anterior and posterior intestine, was evaluated. The in
fl
uence of dietary
macronutrient balance on these digestive processes was also assessed. Four experimental diets with different
protein:lipid:carbohydrate ratios (43/16/28; 43/24/4; 38/19/28 and 38/24/13) were formulated. The
highest activity for acid proteases was located in the stomach at pH 1.5. Alkaline proteolytic activities showed
the highest values in the pyloric caeca and posterior intestine at pH 8.5
–
9.0. Dentex showed substantial
amylase activity in the pyloric caeca and posterior intestine. Lipase activity was higher in the pyloric caeca,
anterior and posterior intestine and was not detected in the stomach. Feed composition in
fl
uenced alkaline
protease activity in the anterior and posterior intestine and was higher for the diet with less protein and
more carbohydrates. Enhanced amylase activity was observed in the pyloric caeca and posterior intestine in
those groups fed on higher carbohydrate and lower lipid level diets. High dietary carbohydrate levels
produced the highest lipase activity but this only occurred in the anterior intestine. We can conclude that the
digestive tract of dentex adapts well to protein digestion and possesses a high potential for digesting the
other dietary macronutrients, too. Dietary carbohydrate content seems to induce changes in protease,
amylase and lipase activity.
Digestive physiology of on-growing common dentex (
Dentex dentex
), including protease, amylase and lipase
activity in stomach, pyloric caeca, anterior and posterior intestine, was evaluated. The in
fl
uence of dietary
macronutrient balance on these digestive processes was also assessed. Four experimental diets with different
protein:lipid:carbohydrate ratios (43/16/28; 43/24/4; 38/19/28 and 38/24/13) were formulated. The
highest activity for acid proteases was located in the stomach at pH 1.5. Alkaline proteolytic activities showed
the highest values in the pyloric caeca and posterior intestine at pH 8.5
–
9.0. Dentex showed substantial
amylase activity in the pyloric caeca and posterior intestine. Lipase activity was higher in the pyloric caeca,
anterior and posterior intestine and was not detected in the stomach. Feed composition in
fl
uenced alkaline
protease activity in the anterior and posterior intestine and was higher for the diet with less protein and
more carbohydrates. Enhanced amylase activity was observed in the pyloric caeca and posterior intestine in
those groups fed on higher carbohydrate and lower lipid level diets. High dietary carbohydrate levels
produced the highest lipase activity but this only occurred in the anterior intestine. We can conclude that the
digestive tract of dentex adapts well to protein digestion and possesses a high potential for digesting the
other dietary macronutrients, too. Dietary carbohydrate content seems to induce changes in protease,
amylase and lipase activity.
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