Developing model equation to subdivide lysine requirements into requirement for growth and maintenance in pigs |
C. J. Yang, D. W. Lee, I. B. Chung, Y. M. Cho, I. S. Shin, B. J. Chae, J. H. Kim, In K. Han |
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Abstract |
Purified diets containing 5 graded levels of lysine were fed to young and growing pigs to determine the lysine requirement for growth and maintenance. A model was developed to subdivide the lysine requirement for the maintenance from requirement for growth. From this model, the lysine requirement for growth was 18.018 and 19.431 g/kg live weight gain and the maintenance requirement was 0.115 and 0.033 g per unit of metabolic body size at each stage of growth, respectively. In the young pigs, the lysine requirement for growth was 0.950 g/g N gain and the maintenance for growth was 0.114 g per unit of metabolic body size. The breakpoint of plasma lysine concentrations was 8.695 and 13.464 g/d, respectively. Expected requirements obtained from these formulae were in general agreement with previous estimates. Based on weight gain vs N gain equation, about 7.92% of the retained protein was comprised of lysine as compared to 7.11%, the mean lysine content of pig muscle CP. |
Keywords:
Lysine; Requirement; Maintenance; Growth; Body Composition; Plasma |
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