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.
Longstaff
M A
MA
Agricultural and Food Research Council Institute of Animal Physiology and Genetics Research, Edinburgh Research Station, Roslin, Midlothian.
McNab
J M
JM
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