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Polyunsaturated fatty acids reduce insulin and very low density lipoprotein levels in broiler chickens.
Poultry Science 2003 July
An experiment was conducted to study the effect of different dietary fatty acid profiles on plasma levels of insulin, very low density lipoproteins (VLDL), cholesterol, and glucose. Diets with four types of fat (tallow, olive, sunflower, and linseed oils) at an inclusion level of 10% and a basal diet without additional fat were administered to female broiler chickens. Serum insulin, cholesterol, and plasma VLDL were affected by the different treatments; however, glucose concentrations were similar among treatments. In the fasted state, broilers fed diets with sunflower or linseed oil presented lower levels of insulin and cholesterol with respect to those fed tallow or olive oil (P < 0.05). VLDL in the fasted state was reduced in broilers fed sunflower and linseed oils (P < 0.05) with respect to those fed tallow, olive oil, or the basal diet. Plasma levels of VLDL were only significantly correlated with abdominal fat in birds fed the basal diet, in the fed and in the fasted state, and in those fed linseed oil in the fed state (P < 0.05). Results of this experiment suggest that higher insulin levels in broilers fed diets rich in saturated fatty acids could be related to higher fat deposition. Fat deposition in birds fed high fat diets was not correlated with circulating VLDL, which suggested direct dietary fat deposition, except for birds fed linseed oil diets. Although birds fed linseed oil diets presented lower levels of VLDL than those fed tallow, olive oil, or the basal diet, the higher correlation with abdominal fat suggests that in these birds, fat deposition is more dependent on hepatic VLDL secretion, despite the high dietary fat level.
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