The lysine requirement for maintenance and the efficiency of energy utilization for growth in pigs

Ringel, Judith

The efficiency of energy utilization for growth is examined at two different levels of lysine intake to ascertain whether the alteration of protein quality is influencing energy retention and heat production. Considering the lysine requirements for maintenance the problems of transferring results from experiments with a feeding strategy close to the expected values for maintenance to an effectively growing animal and the inaccurateness of a vast extrapolation are circumvented by assuming a constant marginal efficiency of lysine utilization for retained protein. Prerequisites for the latter are the following hypotheses of independence: 1) linearity of retained protein-lysine intake; 2) independence of lysine utilization from animal size; 3) independence of lysine utilization from the animals capacity for growth; 4) independence of lysine utilization from the level of protein supply; 5) a constant marginal efficiency for lysine utilization, independent from energy intake and 6) independence of lysine utilization from lysine intake level.

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Ringel, Judith: The lysine requirement for maintenance and the efficiency of energy utilization for growth in pigs. 2005.

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