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Cited by 35Ruminant Nutrition and Digestive PhysiologyReproductive Physiology in LivestockAnimal Nutrition and Physiology

Impact of severity of ruminal acidosis on feed-sorting behaviour of beef cattle

DeVries, T. J., Schwaiger, T., Beauchemin, K. A., Penner, G. B.·2014·Animal Production Science
DOI 10.1071/an14227
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Abstract

The objective of this study was to determine how feed sorting changes in response to the severity of an induced episode of acute ruminal acidosis. Sixteen Angus heifers (261 ± 6.1 kg; bodyweight (BW) ± s.e.m.) were adapted to a high-grain diet (9% forage) before a ruminal acidosis challenge. Ruminal acidosis was induced by restricting feed to 50% of dry matter intake (DMI) as a proportion of BW for 24 h, followed by an intra-ruminal infusion of ground barley at 10% of DMI as a proportion of BW. Ruminal pH and feed sorting were monitored for 8 days (Base) before the challenge and on the challenge (CH) day. Ruminal pH data (duration (min) and area above the curve (min × pH) of pH <5.5) were recorded using an indwelling measurement system. To assess feed sorting, feed and orts were sampled daily and subjected to particle-size analysis. The particle separator had three screens (19, 8, 1.18 mm) and a bottom pan, resulting in four fractions (long, medium, short, fine). Sorting (%) was calculated as the actual intake/predicted intake of each particle fraction. During the Base period and the CH day, heifers sorted for long, medium and short particles, and sorted against fine particles. During the Base period, heifers experienced ruminal pH <5.5 for 489 ± 73 min/day with an area of 154 ± 29 (pH × min)/day; on the CH day, the duration increased to 1020 ± 75 min/day with an area of 631 ± 102 (pH × min)/day. A greater change in duration of pH <5.5 was associated with a greater increase in sorting for long and medium particles. A greater change in the area of pH <5.5 was associated with a greater increase in sorting for long particles and against fine particles. Overall, results show that cattle that experienced a greater degree of acidosis partially coped by sorting their ration more to consume a greater proportion of long, fibrous particles.

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Authors
DeVries, T. J., Schwaiger, T., Beauchemin, K. A., & Penner, G. B.
Affiliations
  • University of Guelph (CA)
  • Agriculture and Agri-Food Canada (CA)
  • University of Saskatchewan (CA)
Corresponding author
DeVries, T. J.
ORCID
Venue
Animal Production Science
Publisher
CSIRO Publishing
Published
2014-07-10
Volume
54
Issue
9
Pages
1238-1242
ISSN
  • 1836-0939 (ISSN-L)
  • 1836-5787
DOI
10.1071/an14227
OpenAlex
W2100969699
Cited by
35
References
14
Citations by year
2026: 1 · 2025: 1 · 2024: 7 · 2023: 4 · 2022: 3 · 2021: 2 · 2020: 2 · 2019: 3 · 2018: 4 · 2016: 3 · 2015: 5
FWCI
5.32
Type
journal article
Language
en
Open access
closed
Licence
doi.org/10.1071/journalslicense (vor, 3948 d)
Locations
Animal Production Science (publishedVersion)
Funders
Alberta Livestock and Meat Agency
Topics
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Ruminant Nutrition and Digestive Physiology
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Reproductive Physiology in Livestock
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
Keywords
rumen acidosis, beef heifers, rumen pH, particle size, high-concentrate diet, rumen fermentation, dietary fiber intake, coping behaviour

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