Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Developing Model Equation to Subdivide Threonine Requirements into Requirements for Growth and Maintenance in Pigs

  • Yang, C.J. (Department of Animal Science and Technology, College of Agriculture and Life Sciences Seoul National University) ;
  • Lee, D.W. (Department Animal Science, College of Agriculture, Suncheon National University) ;
  • Chung, I.B. (National Livestock Research Institute, R.D.A.) ;
  • Kim, Y.H. (National Livestock Research Institute, R.D.A.) ;
  • Shin, I.S. (American Soybean Association) ;
  • Chae, B.J. (Department of Animal Science and Technology, College of Agriculture and Life Sciences Seoul National University) ;
  • Kim, J.H. (Department of Animal Science and Technology, College of Agriculture and Life Sciences Seoul National University) ;
  • Han, In K. (Department of Animal Science and Technology, College of Agriculture and Life Sciences Seoul National University)
  • Received : 1996.02.14
  • Accepted : 1996.11.15
  • Published : 1997.02.01
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Abstract

Purified diets containing 5 graded levels of threonine were fed to young, growing and finishing pigs to determine the threonine requirement for growth and maintenance. A model was developed to subdivide the threonine requirement for the maintenance from the requirement for growth. From this model, the threonine requirement for growth was 7.733, 10.968 and 11.235 g/kg live weight gain and the maintenance requirement was 0.118, 0.048 and 0.024 g per unit of metabolic body size at each stage of growth, respectively. In the young pigs, the threonine requirement for growth was 0.388 g/g N gain and the maintenance requirement was 0.122 g per unit of metabolic body size. The breakpoint of plasma threonine concentrations was 3.995, 7.933 and 7.738 g/d, respectively. Expected requirements obtained from these formulae were in general agreement with previous estimates. Based on the weight gain vs N gain equation, about 4.24% of the retained protein was comprised of threonine and compared to 3.81%, the mean threonine content of pig muscle CP.

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