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Unformatted text preview: mouth or stomach, but these are primarily important in nursing animals to digest milk fat o Lingual lipase (non‐ruminant), pregastric esterase (ruminant), gastric lipase (stomach of non‐ruminants) These enzymes do not require bile to function properly and prefer to digest short and medium chain fatty acids and usually act on the fatty acids at the sn‐3 position The majority of digestion occurs in the small intestine (see diagram from class that gives the overview) o Phase 1 – emulsification to overcome water solubility issues Bile (produced in the liver, stored in the gallbladder – except horse) begins emulsification Detergent action – increase surface area for greater enzymatic digestion o Phase 2 – Enzymatic digestion to overcome large triglyceride size Pancreatic lipase removes fatty acids from sn‐1 and sn‐3 of triglyceride Fatty acid at sn‐2 remains attached to glycerol Required pancreatic colipase which interacts with the triglyceride and pancreatic lipase o Activated by trypsin o Displaces bile and improves activity of pancreatic lipase Ruminant lipid digestion begins with modifications in the rumen o Lipolysis – microbes break the triglyceride into glycerol and 3 fatty acids o Biohydrogenation – the 3 fatty acids are modified by the microbes H added to saturate double bonds This H would normally be used for methane production in the rumen in conjunction with acetate production Diets hig...
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- Fall '10