2011
DOI: 10.1007/s10344-011-0581-3
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Tracking the fate of digesta 13C and 15N compositions along the ruminant gastrointestinal tract: Does digestion influence the relationship between diet and faeces?

Abstract: Faecal stable isotope compositions reflect wildlife diets, if digestive processes along the gastrointestinal tract (GIT) do not alter diet-faeces isotopic relationships in an unpredictable way. We investigated 13 C and 15 N compositions of digesta along the ruminant GIT, using Saanen dairy goats kept on pure grass hay or browse for >20 days. Isotopic changes occurred in the ventral rumen, and in the small intestine, where digesta had significantly higher δ 13 C and δ 15 N (associated with lower C or higher N c… Show more

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Cited by 23 publications
(30 citation statements)
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References 39 publications
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“…Moreover, microorganisms fermenting the non-digestible OM in the hindgut could further contribute to the 15 N enrichment of feces as occurs for N leaving the rumen. A decline in δ 15 N values from small intestine content to feces has, however, been previously reported (Sutoh et al, 1987), but the increase or decrease in feces relative to intestinal content may depend on diet type (Codron et al, 2012). However, changes in δ 15 N values across the hindgut would not affect Δ 15 N plasma protein-diet because no AA absorption occurs at this level.…”
Section: Discussionmentioning
confidence: 81%
See 1 more Smart Citation
“…Moreover, microorganisms fermenting the non-digestible OM in the hindgut could further contribute to the 15 N enrichment of feces as occurs for N leaving the rumen. A decline in δ 15 N values from small intestine content to feces has, however, been previously reported (Sutoh et al, 1987), but the increase or decrease in feces relative to intestinal content may depend on diet type (Codron et al, 2012). However, changes in δ 15 N values across the hindgut would not affect Δ 15 N plasma protein-diet because no AA absorption occurs at this level.…”
Section: Discussionmentioning
confidence: 81%
“…Fecal N results from the excretion of undigested feed N, undigested microbial N and endogenous N. Feces from ruminants usually have higher δ 15 N values than the diet (approximately 3‰ to 4‰; Sutoh et al, 1987;Cheng et al, 2011;Codron et al, 2012). As animal tissues are enriched in 15 N relative to diet, it is reasonable to expect that animal secretions into the small intestine may add to the indigestible N as it flows through the intestine.…”
Section: Discussionmentioning
confidence: 99%
“…This experiment was part of a study on the abdominal anatomy (Braun et al., ,b,c) and digestive physiology of goats (Codron et al., ; Zeitz et al., ) and performed under licence Zurich 69/2008 of the cantonal veterinary office. Ten female adult non‐lactating Saanen goats were kept in groups in indoor enclosures (app.…”
Section: Methodsmentioning
confidence: 99%
“…Fecal stable isotopes are widely used in diet studies in mammals and birds 6,23 , since fractionation is not considered to occur during food assimilation 14 . However, a recent study 7 indicated that while fecal δ 13 C is a reliable proxy for diet in mammals, δ 15 N is altered by digestion for unidentified reasons contingent on diet composition. Further study on the diet-fecal δ 15 N relationship in H. scabra should be conducted using different food items to confirm the validity of fecal isotope proxies.…”
mentioning
confidence: 99%