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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  );
  • 초록

    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.


  • 주제어

    Threonine .   Requirement .   Maintenance .   Growth .   Body Composition .   Plasma Concentration .   Purified Diets .   Pigs.  

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