Gradients in fracture force and grazing resistance across canopy layers in seven tropical grass species

A.A.A. Jacobs, J.A. Scheper, M.A. Benvenutti, I.J. Gordon, D.P. Poppi, A. Elgersma

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

In reproductive swards, stems can act as a barrier that affects the grazing behaviour of ruminant livestock. The barrier effect of stems is closely associated with both the force required to fracture the stems and the density of these stems (in combination, these make up grazing resistance), and these factors need to be considered when making predictions about the forage intake of ruminants grazing reproductive pastures. Differences in grazing resistance between sward canopy layers of different grass species are thought to affect bite dimensions, but data are scarce. In this study, we assessed the grazing resistance for three canopy layers of seven tropical grass species. Species differed significantly in grazing resistance for every canopy layer, with a general ranking order for grazing resistance, in ascending order: Cenchrus ciliaris (‘American' buffel), Digitaria milanjiana (‘Jarra’ finger grass), Setaria surgens (annual pigeon grass), Setaria sphacelata (‘Narok’ setaria), Dichanthium sericeum (Queensland bluegrass), Chloris gayana (‘Callide’ Rhodes grass). In the top canopy layer, grazing resistance did not appear to create a barrier for any of the species, but in the bottom canopy layer, it did for all species. Species also differed in the relative contribution of fracture force and density to grazing resistance. The results highlight the importance of managing the grazing systems to minimize the barrier effect of the stems, which can be done by controlling the phenological stage of the pasture and the grass species and animal size used in the system.
LanguageEnglish
Pages278-287
JournalGrass and Forage Science
Volume68
Issue number2
DOIs
Publication statusPublished - 2013

Fingerprint

grazing
canopy
grass
grasses
stem
stems
Setaria (Poaceae)
Chloris gayana
sward
ruminant
Digitaria milanjiana
ruminants
pasture
Dichanthium
Setaria sphacelata
pastures
Cenchrus ciliaris
pigeons
Queensland
ranking

Keywords

  • foraging behavior
  • nutritive-value
  • cattle
  • sward
  • pastures
  • density
  • growth
  • steers
  • stems

Cite this

Jacobs, A.A.A. ; Scheper, J.A. ; Benvenutti, M.A. ; Gordon, I.J. ; Poppi, D.P. ; Elgersma, A. / Gradients in fracture force and grazing resistance across canopy layers in seven tropical grass species. In: Grass and Forage Science. 2013 ; Vol. 68, No. 2. pp. 278-287.
@article{7d7bb48176dc41518fa6de4c513cdde9,
title = "Gradients in fracture force and grazing resistance across canopy layers in seven tropical grass species",
abstract = "In reproductive swards, stems can act as a barrier that affects the grazing behaviour of ruminant livestock. The barrier effect of stems is closely associated with both the force required to fracture the stems and the density of these stems (in combination, these make up grazing resistance), and these factors need to be considered when making predictions about the forage intake of ruminants grazing reproductive pastures. Differences in grazing resistance between sward canopy layers of different grass species are thought to affect bite dimensions, but data are scarce. In this study, we assessed the grazing resistance for three canopy layers of seven tropical grass species. Species differed significantly in grazing resistance for every canopy layer, with a general ranking order for grazing resistance, in ascending order: Cenchrus ciliaris (‘American' buffel), Digitaria milanjiana (‘Jarra’ finger grass), Setaria surgens (annual pigeon grass), Setaria sphacelata (‘Narok’ setaria), Dichanthium sericeum (Queensland bluegrass), Chloris gayana (‘Callide’ Rhodes grass). In the top canopy layer, grazing resistance did not appear to create a barrier for any of the species, but in the bottom canopy layer, it did for all species. Species also differed in the relative contribution of fracture force and density to grazing resistance. The results highlight the importance of managing the grazing systems to minimize the barrier effect of the stems, which can be done by controlling the phenological stage of the pasture and the grass species and animal size used in the system.",
keywords = "foraging behavior, nutritive-value, cattle, sward, pastures, density, growth, steers, stems",
author = "A.A.A. Jacobs and J.A. Scheper and M.A. Benvenutti and I.J. Gordon and D.P. Poppi and A. Elgersma",
year = "2013",
doi = "10.1111/j.1365-2494.2012.00900.x",
language = "English",
volume = "68",
pages = "278--287",
journal = "Grass and Forage Science",
issn = "0142-5242",
publisher = "Wiley",
number = "2",

}

Gradients in fracture force and grazing resistance across canopy layers in seven tropical grass species. / Jacobs, A.A.A.; Scheper, J.A.; Benvenutti, M.A.; Gordon, I.J.; Poppi, D.P.; Elgersma, A.

In: Grass and Forage Science, Vol. 68, No. 2, 2013, p. 278-287.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Gradients in fracture force and grazing resistance across canopy layers in seven tropical grass species

AU - Jacobs, A.A.A.

AU - Scheper, J.A.

AU - Benvenutti, M.A.

AU - Gordon, I.J.

AU - Poppi, D.P.

AU - Elgersma, A.

PY - 2013

Y1 - 2013

N2 - In reproductive swards, stems can act as a barrier that affects the grazing behaviour of ruminant livestock. The barrier effect of stems is closely associated with both the force required to fracture the stems and the density of these stems (in combination, these make up grazing resistance), and these factors need to be considered when making predictions about the forage intake of ruminants grazing reproductive pastures. Differences in grazing resistance between sward canopy layers of different grass species are thought to affect bite dimensions, but data are scarce. In this study, we assessed the grazing resistance for three canopy layers of seven tropical grass species. Species differed significantly in grazing resistance for every canopy layer, with a general ranking order for grazing resistance, in ascending order: Cenchrus ciliaris (‘American' buffel), Digitaria milanjiana (‘Jarra’ finger grass), Setaria surgens (annual pigeon grass), Setaria sphacelata (‘Narok’ setaria), Dichanthium sericeum (Queensland bluegrass), Chloris gayana (‘Callide’ Rhodes grass). In the top canopy layer, grazing resistance did not appear to create a barrier for any of the species, but in the bottom canopy layer, it did for all species. Species also differed in the relative contribution of fracture force and density to grazing resistance. The results highlight the importance of managing the grazing systems to minimize the barrier effect of the stems, which can be done by controlling the phenological stage of the pasture and the grass species and animal size used in the system.

AB - In reproductive swards, stems can act as a barrier that affects the grazing behaviour of ruminant livestock. The barrier effect of stems is closely associated with both the force required to fracture the stems and the density of these stems (in combination, these make up grazing resistance), and these factors need to be considered when making predictions about the forage intake of ruminants grazing reproductive pastures. Differences in grazing resistance between sward canopy layers of different grass species are thought to affect bite dimensions, but data are scarce. In this study, we assessed the grazing resistance for three canopy layers of seven tropical grass species. Species differed significantly in grazing resistance for every canopy layer, with a general ranking order for grazing resistance, in ascending order: Cenchrus ciliaris (‘American' buffel), Digitaria milanjiana (‘Jarra’ finger grass), Setaria surgens (annual pigeon grass), Setaria sphacelata (‘Narok’ setaria), Dichanthium sericeum (Queensland bluegrass), Chloris gayana (‘Callide’ Rhodes grass). In the top canopy layer, grazing resistance did not appear to create a barrier for any of the species, but in the bottom canopy layer, it did for all species. Species also differed in the relative contribution of fracture force and density to grazing resistance. The results highlight the importance of managing the grazing systems to minimize the barrier effect of the stems, which can be done by controlling the phenological stage of the pasture and the grass species and animal size used in the system.

KW - foraging behavior

KW - nutritive-value

KW - cattle

KW - sward

KW - pastures

KW - density

KW - growth

KW - steers

KW - stems

U2 - 10.1111/j.1365-2494.2012.00900.x

DO - 10.1111/j.1365-2494.2012.00900.x

M3 - Article

VL - 68

SP - 278

EP - 287

JO - Grass and Forage Science

T2 - Grass and Forage Science

JF - Grass and Forage Science

SN - 0142-5242

IS - 2

ER -