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Nutrient Metabolism

Ileal Endogenous Nitrogen Recovery Is Increased and Its Amino Acid Pattern Is Altered in Pigs Fed Quebracho Extract^1,2

Animal Nutrition Group, Wageningen Institute of Animal Sciences (WIAS), Wageningen University and Research Centre, 6700 AH Wageningen, The Netherlands and ^* Centre for Isotope Research, University Groningen, Groningen, The Netherlands

³To whom correspondence should be addressed. E-mail: Carina.Steendam{at}wur.nl.

Ileal endogenous nitrogen recovery (ENR) in pigs (9 ± 0.6 kg body weight) was estimated simultaneously using the ¹⁵N-isotope dilution technique (¹⁵N-IDT) and the peptide alimentation ultrafiltration (UF) method. Diets were cornstarch, enzyme-hydrolyzed casein with no (control) or high (4%) content of quebracho extract (Schinopsis spp.) rich in condensed tannins. The amino acid (AA) pattern of the ENR was also determined. The ENR of pigs fed the quebracho diet was higher (P = 0.0001) than that of pigs fed the control diet [6.00 vs. 1.95 g/kg dry matter intake (DMI) for the ¹⁵N-IDT and 5.18 vs. 1.49 g/kg DMI for the UF method, respectively]. With the ¹⁵N-IDT, ENR values were 0.44–0.79 g/kg DMI (24%) higher (control P = 0.0032, quebracho P = 0.0002) than for the UF method. Apparent nitrogen digestibility depended on diet (69.0% quebracho vs. 86.0% control, P = 0.0001). Real nitrogen digestibility (RD-N) determined by the UF method was higher (P = 0.0001) for the control than for the quebracho diet (91.4 vs. 88.2%). Corresponding values for the ¹⁵N-IDT did not differ (P = 0.0569) between diets (92.8 vs. 91.4%). The ¹⁵N-IDT gave higher values for RD-N of both diets (control P = 0.0030, quebracho P = 0.0002) compared with the UF method. Endogenous AA recoveries (g/kg DMI) were increased 300% (P = 0.0001) and the AA-pattern of ENR was changed (P from 0.0001 to 0.7530 for different AA) by the quebracho diet. A constant AA-pattern of ENR cannot be assumed. Despite limitations of both techniques, the ¹⁵N-IDT and the UF method gave similar results with respect to ENR.

KEY WORDS: • quebracho extract • ¹⁵N-isotope dilution technique • peptide alimentation ultrafiltration • endogenous amino acids • condensed tannin

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