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EFFECTS OF LYSINE AND ENERGY LEVELS ON GROWTH PERFORMANCE THIGH MUSCLE COMPOSITION AND UTILIZATION OF NUTRIENTS IN BROILER CHICKS

  • Park, B.C. (College of Agriculture and Life Sciences, Seoul National University) ;
  • Han, I.K. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Seoul National University) ;
  • Choi, Y.J. (College of Agriculture and Life Sciences, Seoul National University) ;
  • Yun, C.H. (College of Agriculture and Life Sciences, Seoul National University)
  • Received : 1991.03.15
  • Accepted : 1991.12.23
  • Published : 1992.03.01

Abstract

The effects of dietary levels of lysine and energy on growth performance, the content of DNA, RNA and protein in liver, thigh muscle composition and nutrient utilization in broiler chicks were investigated in an experiment involvies with 2 levels of dietary energy : 3,200 (2900) 2,900 (2700) kcal ME/kg) and 6 levels of lysine : 0.6(0.5), 0.8(0.7), 1.0(0.9), 1.2(1.1), 1.4(1.3), and 1.6(1.5)% was carried out. A total number of 384 male broiler chicks was used for a period of 7 weeks. Body weight gain of 1.0(0.9)% lysine level group was significantly (p < 0.01) higher than that of any other groups. Interaction between lysine and energy in the feed intake was observed (p < 0.05). Present data indicate that the content of DNA in liver tissues was significantly (p < 0.05) different by the levels of lysine, namely, 1.0(0.9)% or 1.2(1.1)% lysine level groups showed higher content than other groups (p < 0.01). Dietary levels of 1.2(1.1)% or 1.6(1.5)% lysine groups showed the highest protein content in thigh muscle tissues than that of any other groups (p < 0.05). Interaction between energy and lysine in the content of protein of thigh muscle tissues was shown (p < 0.01). The level of 0.6% lysine group showed the highest fat content in thigh muscle tissues than any other groups. Interaction between lysine and energy in the content of crude ash and crude fat of thigh muscle tissues was observed (p < 0.01). Apparent amino acid availability of arginine, glycine and threonine (p < 0.01), phenylalanine (p < 0.05) were significantly affected by the levels of lysine and interaction between lysine and energy was found only in arginine (p < 0.01).

Keywords

Lysine;Energy;Lysine-Energy Interaction;Broiler Chicks