The effect of concentration of tannin-rich bean hulls (Vicia faba L.) on activities of lipase (EC 3.1.1.3) and alpha-amylase (EC 3.2.1.1) in digesta and pancreas and on the digestion of lipid and starch by young chicks.
The effect of different concentrations of tannin-rich field-bean (Vicia faba L.) hulls at 0, 20, 50, 150 and 300 g/kg dietary inclusion on the activities of lipase (EC 3.1.1.3) and alpha-amylase (EC 3.2.1.1) in digesta and pancreas and on the digestion of lipid and starch was studied in 2-3-week-old male broiler chicks. Low dietary concentrations of tannins (20 and 50 g hulls/kg) enhanced the activity of lipase in digesta from both the jejunum and ileum, the 20 g hulls/kg effecting the greatest enhancement, but no stimulatory effect on the activity of digesta alpha-amylase was observed. High dietary concentrations of tannins (150 and 300 g hulls/kg) inhibited both lipase and alpha-amylase activities in digesta from both the jejunum and ileum, the 30 g hulls/kg causing the most inhibition. Tannins did not increase the activities of lipase or alpha-amylase in pancreatic homogenates, but at high concentrations (150 and 300 g hulls/kg) they lowered slightly the pancreatic activity of alpha-amylase. Nutrient digestion was less influenced by the concentration of tannins than digesta enzyme activities.
Agricultural and Food Research Council Institute of Animal Physiology and Genetics Research, Edinburgh Research Station, Roslin, Midlothian.
M A
MA
Longstaff
J M
JM
McNab
D000818:Animals; D002645:Chickens; D004040:Dietary Carbohydrates / Q000378:metabolism*; D004041:Dietary Fats / Q000378:metabolism*; D004063:Digestion / Q000187:drug effects; D007887:Fabaceae / Q000737:chemistry; D005766:Gastrointestinal Contents / Q000737:chemistry*; D008049:Lipase / Q000378:metabolism*; D008297:Male; D010179:Pancreas / Q000201:enzymology*; D010946:Plants, Medicinal; D013213:Starch / Q000378:metabolism*; D013634:Tannins / Q000494:pharmacology; D000516:alpha-Amylases / Q000378:metabolism*
D004040:Dietary Carbohydrates; D004041:Dietary Fats; D013634:Tannins; D013213:Starch; D008049:Lipase; D000516:alpha-Amylases