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To estimate long-term effects of dietary protein quality on energy metabolism and thyroid hormone Status ingrowing pigs two experiments were carried out, each using 6 growing German Landrace barrows (40 to 90 kgbody weight (BW)) per treatment group, which were fed semisynthetic isoenergetic diets based on either caseinor soy protein isolate at 1875 kJ ME/(kg BW<sup>0,62</sup> x d). Casein was tested with (CAS+) amino acid (AA)supplementation (methionine + cystine, threonine, tryptophane) and soy protein isolate was tested without (SPI-)AA supplementation at the recommended protein supply of 100% (normal protein level (NP)) and at a proteinsupply of 50% of NP. During experiments pigs were housed individually in metabolic cages at 23 ± 1 °C. At bothprotein supply levels, SP1- in comparison to CAS+ caused a lower protein energy retention (PER), which wascompensated mainly by an increased fat energy retention (FER). The reduction of the protein supply to 50%caused a lower PER by 30 to 50% in both dietary qualities, which was compensated by a significantly higherFER. However, the heat production (HP) was neither affected by the protein quality nor by the quantity, andresulted in nearly similar values of 60% of ME intake. The thyroid hormone concentrations were dependentprimarily on the amount of protein supply, and after decrease of supply to 50% secondly on the dietary proteinquality. The increased thyroid hormone concentrations at the 50% protein level were in euthyroid range of pigsand obviously not associated with HP

Effects of dietary protein quality on energy metabolism and thyroid hormone Status in growing pigs