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Swine Nutrition and Feed Technology
Asian-Australasian Journal of Animal Sciences 1997;10(1): 122-133.
DOI: https://doi.org/10.5713/ajas.1997.122    Published online February 1, 1997.
Developing model equation to subdivide threonine requirements into requirement for growth and maintenance in pigs
C. J. Yang, D. W. Lee, I. B. Chung, Y. H. Kim, I. S. Shin, B. J. Chae, J. H. Kim, In K. Han
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.
Keywords: Threonine; Requirement; Maintenance; Growth; Body Composition; Plasma Concentration


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