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Increasing feed intake in domestic goats (Capra hircus): Measured effects on chewing intensity are probably driven by escape of few, large particles from the forestomach

Findeisen, Eva; Südekum, Karl-Heinz; Hummel, Jürgen; Clauss, Marcus (2021). Increasing feed intake in domestic goats (Capra hircus): Measured effects on chewing intensity are probably driven by escape of few, large particles from the forestomach. Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 257:110972.

Abstract

On the one hand, oral processing – mastication – is considered a relatively inflexible component of mammalian feed acquisition that constrains instantaneous intake rates. On the other hand, experimental data shows that the level of feed intake affects faecal particle size and hence net chewing efficiency in ruminants, with larger particles occurring in the faeces at higher intakes. Here, we report the effect of an increased feed intake during maintenance (L1), late (200% of L1) and peak lactation (300% of L1) of a consistent diet (hay:concentrates 50:50) in eight domestic goats on various measures of digestive physiology including faecal mean particle size (MPS). Increasing intake led to an increased gut fill, a reduction in digesta retention times, and an increase in faecal MPS (from 0.57 to 0.72 mm). However, this was an effect of the large particle fraction (>2 mm) being disproportionately excreted at higher intakes; if MPS was assessed on the basis of particles below the typical escape threshold (≤1 mm), there was no difference between intake levels. These findings suggest that the effect of intake on the calculated net chewing efficiency in ruminants may rather be an effect of increased large particle escape from the forestomach than a reduced chewing intensity per bolus during ingestion or rumination.

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Department of Small Animals
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Scopus Subject Areas:Life Sciences > Biochemistry
Life Sciences > Physiology
Life Sciences > Aquatic Science
Life Sciences > Animal Science and Zoology
Life Sciences > Molecular Biology
Uncontrolled Keywords:Biochemistry, Physiology, Molecular Biology
Language:English
Date:1 July 2021
Deposited On:20 May 2021 11:20
Last Modified:25 Oct 2024 01:39
Publisher:Elsevier
ISSN:1095-6433
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.cbpa.2021.110972
PubMed ID:33940177
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