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Forestomach pH in hunted roe deer ( Capreolus capreolus ) in relation to forestomach region, time of measurement and supplemental feeding and comparison among wild ruminant species

Ritz, Julia ; Hofer, Kurt ; Hofer, Erich ; Hackländer, Klaus ; Immekus, Dieter ; Codron, Daryl ; Clauss, Marcus

In: European Journal of Wildlife Research, 2013, vol. 59, no. 4, p. 505-517

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    Titre
    • Forestomach pH in hunted roe deer ( Capreolus capreolus ) in relation to forestomach region, time of measurement and supplemental feeding and comparison among wild ruminant species
    Auteur
    • Ritz, Julia. Department of Farm Animals, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057, Zurich, Switzerland
    • Hofer, Kurt. Fair Hunt e.U, Wolkersbergenstrasse 152, 1130, Vienna, Austria
    • Hofer, Erich. Fair Hunt e.U, Wolkersbergenstrasse 152, 1130, Vienna, Austria
    • Hackländer, Klaus. Institute of Wildlife Biology and Game Management, University of Natural Resources and Life Sciences, Vienna, Gregor-Mendel-Strasse 33, 1180, Vienna, Austria
    • Immekus, Dieter. Labor für Umweltschutz und chemische Analytik, Riedholz 36, 88167, Maierhöfen, Allgäu, Germany
    • Codron, Daryl. Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057, Zurich, Switzerland
    • Clauss, Marcus. Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • European Journal of Wildlife Research, 2013, vol. 59, no. 4, p. 505-517. Springer Berlin Heidelberg
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:314504
    Summary
    There is a debate whether supplemental feeding of deer bears the risk of inducing health problems, in particular acidosis. Here, the pH values of forestomach contents of free-ranging roe deer (Capreolus capreolus) shot in areas with and without supplemental winter feeding were compared. pH was similar in the dorsal and ventral rumen, but lower at these sites than in the Atrium ruminis, where it was again lower than in the reticulum; this pattern corresponds to expectations based on differences in the presence of saliva at the different sites of the forestomach. pH was lower with increasing time that elapsed between death of the animal and measuring pH in unsupplemented animals and was lower in unsupplemented animals in May/June than later in the year. Animals with supplemental winter feeding had significantly lower rumen pH (5.5) than animals without food supplementation (5.7). These data suggest that supplemental feeding of roe deer has the potential to lower forestomach pH. Although pH values measured in supplemented animals in this study would be considered indicative of rumen acidosis in domestic cattle, they are within the range previously measured in various free-ranging Odocoilid species, including roe deer; were of a similar magnitude as the May/June values of unsupplemented roe deer in this study; and must be considered with respect to potentially rapid declines in pH between death of the animal and pH measurement. Given methodological problems, analyses of literature data from free-ranging wild ruminants provide little evidence for a systematic variation of rumen pH with feeding type and body mass, but lead to the hypothesis that some New World cervids, including the roe deer, might either naturally have lower pH values than other ruminants or rumen contents whose pH drops rapidly after death