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Tryptophan Metabolism in Pigs

Tryptofanomsætningezi hos svin: Relation til syntese og funktion af serotonin

Relation to Synthesis and Function of Serotonin

Abstract

Contrary to blood serotonin the level of free and total tryptophan is distinctly influenced by feed intensity and composition. Piglets show a considerably higher plasma free tryptophan and blood serotonin content than adult pigs, just as boars possess a significantly higher blood level of tryptophan and serotonin than sows. A pronounced individual variation of blood serotonin and a much less variable content among littermate pigs provide evidence that blood serotonin is genetically controlled. Tryptophan is readily absorbed and distributed in a characteristic manner among investigated organs and tissues. A genetical control of blood serotonin and its possible relation with type of reaction exhibited by ergometer exercised pigs support the influence of tryptophan and serotonin on the ability of pigs to withstand controlled environmental conditions such as physical exercise.

Sammendrag

Effekten af såvel ydre som genetiske faktorer på blodets Trp- og 5-HT-indhold er undersøgt hos Dansk Landrace svin.

Ved tilførsel af mærket (3H-Trp) og ikke mærket Trp er endvidere undersøgt tryptofans resorption, transport, fordeling samt relation til serotoninsyntesen.

Plasmaets indhoid af fri og total Trp er i modsætning til blodets 5-HT markant påvirkelig af næringstilførselens omfang og sammensætning. Unge grise viste et væsentligt høj ere plasma fri Trp og blod 5-HT indhold end voksne grise, ligesom kønsmodne orner besidder et signifikant højere Trp- og 5-HT-indhold i blodet end sogrise. En betydelig mindre variation af blod 5-HT indenfor kuld end mellem disse tyder på en genetisk kontrol af blodets 5-HT-indhold.

Trp optages hurtigt fra svinets tarmkanal og fordeles på en karakteristisk måde mellem de undersøgte væv og organer. Resultaterne af Trp-belastningen tyder på en nær relation mellem tryptofan- og serotoninomsætningen hos svin.

Den genetiske kontrol af blodets 5-HT-indhold samt dettes sammenhæng med grises reaktion på ergometerbelastning synes at understrege tryptofans og Serotonins betydning for grises adaptationsevne under disse betingelser.

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Acknowledgment

The authors wish to address their gratitude to Professor, dr. med. vet. Johs. Moustgaard on whose initiative the present work was undertaken. For valuable assistance during the work we wish to thank dr. Birthe Palludan.

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Hyldgaard-Jensen, J., Cmiljanić, R., Wegger, I. et al. Tryptophan Metabolism in Pigs. Acta Vet Scand 17, 113–130 (1976). https://doi.org/10.1186/BF03547921

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