Effects Of Dietary Energy Level And Energy Source On Ascites Syndrome In Broilers

Two trials were conducted to study the relationship between dietary energy level or source and ascites syndrome in normal or stress condition with low temperature(LAT) or/and dietary T₃. In trial 1, 120 avian chickens of 1-d-old were randomly divided into 2 groups, group 1 was control with basal diet under normal condition; group 2 was test group with addition of T₃(1.5ppm) under low temperture.There were 6 replicates with 10 broilers in each group. The results were: compared to control, heart index ( 0.31vs0.21) , AS rate (66.7%vs16%)and dead rate(23.3%vs1.7%) of test group were increased.The availability of energy(p<0.01), ether extract(p<0.01), crude protein(p<0.05),and most amino acid (p<0.01) except that of arginine and proline were significantly lower(p<0.01) at the 2^nd week. The availability of energy, and ether extract were lower (p<0.05) at the 3^rd week, while that of protein and arginine were no difference(p>0.05) with control group. The serum growth hormone level was significantly lower(p<0.01) in test group. The results indicated that T₃ and LAT could induce AS that resulted the poor growth performance because of the decrease of availability of energy and nutrients, and lower serum growth hormone.trial two was conducted by using 320 1-d-old Avian broilers to study the effects of dietary energy level and source on ascites syndrome in broilers under normal or stree condition.This trial had a 2×2×2 factorial arrangement of treatments with 2 dietary energy levels(3.3Mcal/kg, 2.8 Mcal/kg), two dietary enery sourses( high fat level provide for 21.7%, low fat level provide for 5.4%) and two dietary T₃ levels(0, 1.5mg/kg). Chickens were randomly allotted into eight treatments, four replicates pertreatment and 10 birds per replication. There were four basal diets with same protein, amino acid, and mineral level except energy level and energy sources. The results were as follows:1. T3 stress could induce AS successfully with the decrease of body weight gain, availability of energy (/K0.01) , serum TG (/K0.01) , while increase of oxygen consumption (/?>0.05) , and Na+/K+-ATP enzyme activity (/?<0.01) , serum glucose(/X0.05) .2. High dietary energy level could increase API (p<0. 01), incidence of ascites, oxygen consumption, and Na7K+-ATP enzyme activity (p<0.01) with the improve of body weight gain, availability of energy .crude protein, ether extrac esperically under the stress condition (/?<0.01) .3. Dietary high fat level had no effect on API, body weight gain, while the availability of crude protein were improved with the decrease of serum TG (/K0.05) and glucose (p<0.01) .It is concluded that high dietary enery level resulted the higher AS because of increase of growth rate, availability of energy and nutrients, Na+/K+-ATP enzyme activity, serum glucose, and oxygen consumption.