Header

UZH-Logo

Maintenance Infos

Controlled feeding experiments with diets of different abrasiveness reveal slow development of mesowear signal in goats (Capra aegagrus hircus)


Ackermans, Nicole L; Winkler, Daniela E; Schulz-Kornas, Ellen; Kaiser, Thomas M; Müller, Dennis W H; Kircher, Patrick R; Hummel, Jürgen; Clauss, Marcus; Hatt, Jean-Michel (2018). Controlled feeding experiments with diets of different abrasiveness reveal slow development of mesowear signal in goats (Capra aegagrus hircus). Journal of Experimental Biology, 221(21):jeb186411.

Abstract

Dental mesowear is applied as a proxy to determine the general diet of mammalian herbivores based on tooth-cusp shape and occlusal relief. Low, blunt cusps are considered typical of grazers and high, sharp cusps typical of browsers. However, how internal or external abrasives impact mesowear, and the time frame the wear signature takes to develop, still need to be explored. Four different pelleted diets of increasing abrasiveness (lucerne, grass, grass and rice husks, and grass, rice husks and sand) were fed to four groups of a total of 28 adult goats in a controlled feeding experiment over a 6-month period. Tooth morphology was captured by medical CT scans at the beginning and end of the experiment. These scans, as well as the crania obtained post mortem, were scored using the mesowear method. Comparisons between diet groups showed few significant differences after 6 months, irrespective of whether CT scans or the real teeth were scored. Only when assessing the difference in signal between the beginning and the end of the experiment did relevant, significant diet-specific effects emerge. Diets containing lower phytolith content caused a more pronounced change inmesowear towards sharper cusps/higher reliefs, while the feed containing sand did not result in more extreme changes in mesowear when compared with the same feed without sand. Our experiment suggests that the formation of a stable and hence reliable mesowear signal requires more time to develop than 6 months.

Abstract

Dental mesowear is applied as a proxy to determine the general diet of mammalian herbivores based on tooth-cusp shape and occlusal relief. Low, blunt cusps are considered typical of grazers and high, sharp cusps typical of browsers. However, how internal or external abrasives impact mesowear, and the time frame the wear signature takes to develop, still need to be explored. Four different pelleted diets of increasing abrasiveness (lucerne, grass, grass and rice husks, and grass, rice husks and sand) were fed to four groups of a total of 28 adult goats in a controlled feeding experiment over a 6-month period. Tooth morphology was captured by medical CT scans at the beginning and end of the experiment. These scans, as well as the crania obtained post mortem, were scored using the mesowear method. Comparisons between diet groups showed few significant differences after 6 months, irrespective of whether CT scans or the real teeth were scored. Only when assessing the difference in signal between the beginning and the end of the experiment did relevant, significant diet-specific effects emerge. Diets containing lower phytolith content caused a more pronounced change inmesowear towards sharper cusps/higher reliefs, while the feed containing sand did not result in more extreme changes in mesowear when compared with the same feed without sand. Our experiment suggests that the formation of a stable and hence reliable mesowear signal requires more time to develop than 6 months.

Statistics

Citations

Dimensions.ai Metrics
13 citations in Web of Science®
13 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

14 downloads since deposited on 05 Nov 2018
12 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Department of Small Animals
05 Vetsuisse Faculty > Veterinary Clinic > Department of Clinical Diagnostics and Services
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Scopus Subject Areas:Life Sciences > Ecology, Evolution, Behavior and Systematics
Life Sciences > Physiology
Life Sciences > Aquatic Science
Life Sciences > Animal Science and Zoology
Life Sciences > Molecular Biology
Life Sciences > Insect Science
Uncontrolled Keywords:Insect Science, Animal Science and Zoology, Aquatic Science, Physiology, Ecology, Evolution, Behavior and Systematics, Molecular Biology
Language:English
Date:1 November 2018
Deposited On:05 Nov 2018 17:50
Last Modified:29 Jul 2020 07:59
Publisher:Company of Biologists
ISSN:0022-0949
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1242/jeb.186411
PubMed ID:30194251
Project Information:
  • : FunderSNF
  • : Grant ID31003A_163300/1
  • : Project Title
  • : FunderH2020
  • : Grant ID681450
  • : Project TitleEvolution of herbivory in vertebrates: developing combined isotope (Ca, Sr) and dental surface texture analysis as deep time diet proxies

Download

Hybrid Open Access

Download PDF  'Controlled feeding experiments with diets of different abrasiveness reveal slow development of mesowear signal in goats (Capra aegagrus hircus)'.
Preview
Content: Published Version
Language: English
Filetype: PDF
Size: 1MB
View at publisher