Effects of dietary macronutrient content on energy metabolism and uncoupling protein mRNA expression in broiler chickens.

摘要: The objective of the present study was to investigate effects dietary macronutrient ratio on energy metabolism and skeletal muscle mRNA expression avian uncoupling protein (UCP), thought be implicated in thermogenesis birds. Broiler chickens from 2 6 weeks age received one three isoenergetic diets containing different ratios (low-lipid (LL) 30 v. 77 g lipid/kg; low-protein (LP) 125 197 crude (Nx6.25)/kg; low-carbohydrate (LC) 440 520 carbohydrate/kg). LP were characterised by significantly lower body weights food intakes compared with LL LC (-47 -38 % respectively) but similar heat production/kg metabolic weight, as measured indirect calorimetry, groups. However, production/g ingested higher animals receiving diet (+41 %, P<0.05). These also deposited 57 less (P<0.05) 33 more fat. No significant differences N balances detected between chickens. fat contents (i.e. diets) induced slightly relative expressions UCP gastrocnemius muscle, reverse transcription-polymerase chain reaction, than (88 90 78 glyceraldehyde-3-phosphate dehydrogenase respectively, Our results are consistent recent view that homologues could involved regulation lipid utilisation fuel substrate provide evidence content regulates especially deposition.