Effect Of High Temperature Environment On Body Fat Deposition And Lipid Metabolism At Different Growth Stages Of Beijing Fatty Chicken

The main object of this thesis is to study the effects of high temperature environment on the performance, body fat deposition and lipid metabolism during the age of 35~56 days and 79~100 days healthy Beijing fatty chicken.1 Effect of high temperature environment on the performance, body fat deposition and lipid metabolism during the age of 35~56 days Beijing fatty chickenOne hundred and eight 35-day-old Beijing fatty chicken male chickens were equally divided into 3 groups to study the effect of high temperature on its body fat deposition and lipid metabolism. There were 6 replicates in each group and 6 chickens in each replication. One group chickens (34AL) were in diurnally high temperature (ET 34±1℃), another group chickens (22AL) fed ad libitum in neutral thermal environment (ET 22±1℃), still another group chickens (22PF) raised in neutral thermal (ET 22±1℃) but gave feed consumed by high temperature just before one day. The result showed:⑴High temperature environment significantly decreased chickens'feed intake, increased their feed conversion.⑵High temperature environment significantly increased chickens'abdominal fat weight and abdominal fat rate. But there were not significant effect on the weight of subcutaneous fat of the right leg and intermuscular fat of the right leg, and the percent of subcutaneous fat of the right leg and intermuscular fat of the right leg.⑶It was not difference in plasma concentration of glucose, serum concentration of insulin and the activity of fatty acid synthase (FAS) in liver, so high temperature environment had not significant effect on de novo fatty acid synthesis pathway of chickens.⑷It wasn't difference in plasma very low density lipoproteins (VLDL), so high temperature environment had not significant effect on lipid metabolism in the liver of chickens.⑸High temperature environment significantly enhanced the activity of 1ipoprotein lipase (LPL) in abdominal fat and intermuscular fat tissue (P < 0.05 or P < 0.01), and significantly increased plasma concentration of free fatty acid (FFA). In conclusion, the chronic exposure of 35-day-old Beijing fatty chicken to a high ambient temperature enhanced lipid metabolism in the adipose tissue. High temperature environment significantly enhanced lipids originating from the intestine (i.e., chylomicrons), resulting in plasma concentration of triglyceride uptake and storage is facilitated in the adipose tissue,...