Effect Of Dietary Energy Levels On Performance,Meat Quality And Blood Physiological And Biochemical Parameters In Broilers

Effect of diet with different energy on production performance, slaughter performance, meet quality, blood physiology and biochemistry index and nutrients metabolism of broilers were studied by a serials experiment. 240 3-day-old healthy Ross 308 broilers were randomly divided into four groups with four replicates of 15 chickens each, respectively.Treatment groups were fed diet separately with energy level 11.97MJ/kg, 12.39MJ/kg, 12.75MJ/kg and 13.23MJ/kg on 0~3 weeks (early stage), and corresponding 12.31MJ/kg, 12.73MJ/kg, 13.15MJ/kg, 13.57MJ/kg on 4~6 weeks (later stage). The results showed as follows:1.Dietary energy level had significant effect on broiler's production performance (P<0.05). Diet with energy level 12.39MJ / kg in the early stage and 13.15MJ / kg in the late stage can improve feed intake of broilers. Over all experimental period, feed intake of the third groups was the highest, group 4 for the minimum. From each feeding stage and the whole of experimental period, there was negative correlation between weight gain to feed consumption ratio and dietary energy level. Ratio of group four was obviously lower than group one (P<0.05).2.To slaughter performance of broilers, dietary energy level had significant effect on 28-day-old and 42-day-old broilers (P<0.05). There was positive correlation between slaughter performance and dietary energy level.3.The studies indicated that dietary energy level had no significant effect on muscle PH and tenderness of meet (P>0.05). However, on biological statistics, the effect on hydraulic system appeared extremely significant (P<0.01). Hydraulic system reduced with the increase of dietary energy level(P>0.05).4.Dietary energy level had significant effect (P<0.05) on blood physiology and biochemistry index of broilers.There was positive correlation between blood glucose and dietary energy level.But triglycerides,serum total cholesterol,high density lipoprotein-cholesterol and low density lipoprotein cholesterol were reduced with dietary energy level increasing. Meanwhile, the LDH and GPT were obviously increased (P<0.05).5.Analysis of dietary energy and nutrient metabolism indicated: there was obvious effect on metabolism of rough protein, phosphorus, rough fiber and fat (P<0.05). It explained that dietary energy level had effected on nutrient supersession, thereby affected production performance, slaughter performance and meet quality of broilers.