Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 344895
Title Surplus dietary tryptophan reduces plasma cortisol and noradrenaline concentrations and enhances recovery after social stress in pigs
Author(s) Koopmans, S.J.; Ruis, M.A.W.; Dekker, R.A.; Diepen, J.T.M. van; Korte, S.M.; Mroz, Z.
Source Physiology and Behavior 85 (2005)4. - ISSN 0031-9384 - p. 469 - 478.
Department(s) ID - Voeding
Research Institute for Animal Husbandry
ID - Dier en Omgeving
Publication type Refereed Article in a scientific journal
Publication year 2005
Keyword(s) salivary cortisol - amino-acids - agonistic behavior - growing pigs - meat quality - performance - metabolites - parameters - serotonin - hormones
Abstract Social stress occurs in intensive pig farming due to aggressive behavior. This stress may be reduced at elevated dietary levels of tryptophan (TRP). In this study, we compared the effects of high (13.2%) vs. normal (3.4%) dietary TRP to large neutral amino acid (LNAA) ratios on behavior and stress hormones in catheterized pigs ( 50 kg BW), which were exposed to social stress by placing them twice into the territory of a dominant pig ( 60 kg) for 15 min. Pre-stress plasma TRP concentrations were 156 ± 15 vs. 53 ± 6 ¿mol/l (p <0.01) in pigs on the high vs. normal TRP diets, respectively. Pre-stress plasma cortisol and noradrenaline concentrations were twofold (p <0.01) and 1.4-fold (p <0.05) lower but plasma adrenaline concentration was similar in pigs on the high vs. normal TRP diets, respectively. During the social confrontations, pigs on the high vs. normal TRP diets show a tendency towards reduced active avoidance behavior (3.2 ± 1.1 vs. 6.7 ± 1.2 min, p <0.1) but their physical activity (8.5 ± 0.6 vs. 10.2 ± 0.8 min) and aggressive attitude towards the dominant pig (11 ± 3 vs. 7 ± 2 times biting) were similar. Immediate (+ 5 min) post-stress plasma cortisol, noradrenaline and adrenaline responses were similar among dietary groups. After the social confrontations, the post-stress plasma cortisol, noradrenaline and adrenaline concentrations and/or curves (from + 5 min to 2 h) were lower/steeper (p <0.05) in pigs on the high vs. normal TRP diets. In summary, surplus TRP in diets for pigs (1) does not significantly affect behavior when exposed to social stress, (2) reduces basal plasma cortisol and noradrenaline concentrations, (3) does not affect the immediate hormonal response to stress, and (4) reduces the long-term hormonal response to stress. In general, pigs receiving high dietary TRP were found to be less affected by stress
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