Interaction between dietary threonine and protein supply on the efficiency of dietary amino acids for protein deposition in piglets at weaning

Seve, B.; Sawadogo, M.; Schaeffer, V.; Dufour Etienne, F.; Bercovici, D.; Cauwenberghe, S. van

Journees de la Recherche Porcine en France 31: 267-274

1999


Accession: 003480901

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Abstract
Variations of protein and amino acid deposition with dietary protein and threonine supplies were studied in piglets at weaning. At each of three protein levels, 17, 22 and 28% (8-10.6 and 13.1 g digestible lysine/kg respectively), four levels of threonine, 2.95, 3.35, 3.74 and 4.14 g/16 g, were compared. With 17% dietary protein, the response of protein deposition was maximal with the second level of threonine; with 22% dietary protein, the two highest levels of threonine gave maximal performance; with 28% dietary protein there was no consistent effect of the threonine level. Therefore, the requirement for threonine is not in proportion of dietary protein. The response of protein deposition to daily dietary protein intake was curvilinear. This indicated that the requirement for threonine was met with a 22% protein diet and a ratio of digestible threonine/digestible lysine within the 0.71-0.78 range. Valorisation of such a high level of dietary threonine seemed possible with the stimulation of threonine dehydrogenase activity in the liver associated with the increase in dietary protein. This may have resulted in a better control of threonine concentration in the plasma, preventing an appetite depression, when threonine intake was increasing. Both the study of plasma amino acid concentrations and comparison of their efficiencies for protein deposition to those previously estimated for the ideal protein suggested that lysine, sulphur amino acids and threonine were co-limiting when the requirement for threonine was met. These observations supported the hypothesis of a relatively higher requirement for threonine and sulphur amino acids in recently weaned piglets than in growing pigs.