Effect Of Dietary Nutrition On Fat Deposition And Mechanism Research

The aim of research is to study the fat deposition regular pattern in modern broilers and the relationship between dietary composition and broiler’s fat deposition speed. Furthermore, the diet’s effect on growth performance, slaughter performance, serum hormone and the function of mitochondria also be analyzed to investigate the mechanisms behind fat deposition. The dietary has different energy and crude protein levels and different ME/CP ratio. The crude protein level of dietary is known as a major factor to effect fat deposition.Experiment 1 Fat deposition in male broilers and growth curve for abdominal fat weightA total of 144 one-day-old male broilers were randomly designed into 12 replicates with 12 broilers per cage. Broilers were slaughtered weekly from 1 to 42 days of age. Live weight, abdominal fat weight and subcutaneous fat thickness were measured, this study also calculate the relative growth coefficients of these indicators. Three non-linear growth models were chosen to fit the data of abdominal fat weight and live weight. The best fitted equation predicted that the maximum growth rate of abdominal fat weight occured at 28 d, earlier than live weight.Experiment 2 Effect of dietary nutrition on performance and fat depositionThis study investigated how low-protein diets with different metabolism energy levels affected performance, fat accumulation, and serum hormone levels of broilers from 1 to 42 days.480 one-day-old AA broiler chickens were randomly divided into 5 groups with 6 replicates in each group and 14 birds in each replicate. Birds were slaughtered weekly. Live weight, weight abdominal fat, thickness of subcutaneous fat, serum hormone was measured. As dietary ME/CP ratio increased, abdominal fat weight increased.Experiment 3 Influence of diet on serum hormones and mitochondrial complex activity in broiler’s liverThis study evaluated the effects of diet on mitochondrial respiratory chain enzyme activities in the iver. Mitochondrial enzymatic complex activities (Ⅱ) was lower in treatment III. The data indicated that a low-protein and low-energy diet decreased the mitochondrial enzyme activities, which was correlated with high F/G ratio of this treatment. Serum triiodothyronine (T3)content increased as ME level increased and the CP levels decreased. Serum free thyroxine (FT4) level was correlated with both subcutaneous fat thickness and abdominal fat weight.Serum T3 levels may has effect on fat synthesis.