Linoleic acid was digested throughout the intestinal tract whereas the, digestion of palmitic stearic and oleic acids,,, Started only in the jejunum. Measurements at the lower ileal level showed that the unsaturated FA (linoleic and oleic acids). Were.Well digested (0.90 to 0.94), irrespective of the source of fat. In contrast the digestibility, of saturated FA (palmitic.And stearic acids) was influenced (P < 0.05) by the fat source. Digestibility coefficients of palmitic and.Stearic acids at lower ileum were markedly higher (P < 0.05) in the diet containing soybean oil (0.77 to 0.85).Compared with that containing tallow (0.58 to 0.68). In, experiment 2 ileal endogenous fat loss was determined.To, be 1 714 mg / kg of DM intake. Endogenous fat was composed mainly of palmitic (75 g / kg), stearic (131 G.Kg), oleic (73 g / kg), linoleic (133 g / kg), and arachidonic (60 g / kg) acids. Fatty acid profile of endogenous fat.Was found to be remarkably similar to that of, the bile suggesting that the reabsorption of fat and FA from the.Bile was incomplete in growing broiler chickens.
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