Effects of continuous or rotational grazing of two perennial ryegrass varieties on the chemical composition of the herbage and the performance of finishing lambs

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Effects of continuous or rotational grazing of two perennial ryegrass varieties on the chemical composition of the herbage and the performance of finishing lambs. / Marley, Christina Louise; Fraser, Mariecia Dawn; Fisher, William J.; Forbes, A. B.; Jones, R.; Moorby, Jonathan Martin; MacRae, John C.; Theodorou, Michael Kyriacos.

In: Grass and Forage Science, Vol. 62, No. 3, 09.2007, p. 255-264.

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Marley, Christina Louise ; Fraser, Mariecia Dawn ; Fisher, William J. ; Forbes, A. B. ; Jones, R. ; Moorby, Jonathan Martin ; MacRae, John C. ; Theodorou, Michael Kyriacos. / Effects of continuous or rotational grazing of two perennial ryegrass varieties on the chemical composition of the herbage and the performance of finishing lambs. In: Grass and Forage Science. 2007 ; Vol. 62, No. 3. pp. 255-264.

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@article{04764e1d6c4349279232473bab432380,
title = "Effects of continuous or rotational grazing of two perennial ryegrass varieties on the chemical composition of the herbage and the performance of finishing lambs",
abstract = "Plant breeding has developed perennial ryegrass varieties with increased concentrations of water-soluble carbohydrates (WSCs) compared with conventional varieties. Water-soluble carbohydrates are major metabolic and storage components in ryegrass. Therefore, if perennial ryegrass herbage is allowed to grow to greater heights it should contain higher water-soluble carbohydrates concentrations, for example as under rotational grazing rather than continuous grazing by livestock. This study investigated this hypothesis and measured the performance of lambs grazed rotationally and continuously. Replicated plots of the variety AberDart (bred to express high WSC concentrations) or the variety Fennema were grazed by a core group of ten male Cheviot lambs for 10 weeks. Lambs were weighed and replicate forage samples were taken every 7 d. Concentrations of WSC in AberDart herbage were significantly (P < 0·05), but not substantially, higher than those in Fennema herbage. Rotational grazing did not increase the differential in WSC concentration between the AberDart and Fennema varieties. However, there was a tendency (P = 0·07) for lambs rotationally grazing the AberDart swards to have a higher final live weight than lambs grazing the Fennema swards. Overall, lamb performance was increased when either perennial ryegrass variety was rotationally rather than continuously grazed (P < 0·001).",
keywords = "water-soluble carbohydrate, lolium perenne, grazing systems, sweetgrass",
author = "Marley, {Christina Louise} and Fraser, {Mariecia Dawn} and Fisher, {William J.} and Forbes, {A. B.} and R. Jones and Moorby, {Jonathan Martin} and MacRae, {John C.} and Theodorou, {Michael Kyriacos}",
note = "Marley, C. L., Fraser, M. D., Fisher, W. J., Forbes, A. B., Jones, R., Moorby, J. M., MacRae, J. C.. Theodorou, M. K.. (2007). Effects of continuous or rotational grazing of two perennial ryegrass varieties on the chemical composition of the herbage and the performance of finishing lambs. Grass and Forage Science, 62 (3), 255-264",
year = "2007",
month = sep,
doi = "10.1111/j.1365-2494.2007.00582.x",
language = "English",
volume = "62",
pages = "255--264",
journal = "Grass and Forage Science",
issn = "0142-5242",
publisher = "Wiley",
number = "3",

}

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TY - JOUR

T1 - Effects of continuous or rotational grazing of two perennial ryegrass varieties on the chemical composition of the herbage and the performance of finishing lambs

AU - Marley, Christina Louise

AU - Fraser, Mariecia Dawn

AU - Fisher, William J.

AU - Forbes, A. B.

AU - Jones, R.

AU - Moorby, Jonathan Martin

AU - MacRae, John C.

AU - Theodorou, Michael Kyriacos

N1 - Marley, C. L., Fraser, M. D., Fisher, W. J., Forbes, A. B., Jones, R., Moorby, J. M., MacRae, J. C.. Theodorou, M. K.. (2007). Effects of continuous or rotational grazing of two perennial ryegrass varieties on the chemical composition of the herbage and the performance of finishing lambs. Grass and Forage Science, 62 (3), 255-264

PY - 2007/9

Y1 - 2007/9

N2 - Plant breeding has developed perennial ryegrass varieties with increased concentrations of water-soluble carbohydrates (WSCs) compared with conventional varieties. Water-soluble carbohydrates are major metabolic and storage components in ryegrass. Therefore, if perennial ryegrass herbage is allowed to grow to greater heights it should contain higher water-soluble carbohydrates concentrations, for example as under rotational grazing rather than continuous grazing by livestock. This study investigated this hypothesis and measured the performance of lambs grazed rotationally and continuously. Replicated plots of the variety AberDart (bred to express high WSC concentrations) or the variety Fennema were grazed by a core group of ten male Cheviot lambs for 10 weeks. Lambs were weighed and replicate forage samples were taken every 7 d. Concentrations of WSC in AberDart herbage were significantly (P < 0·05), but not substantially, higher than those in Fennema herbage. Rotational grazing did not increase the differential in WSC concentration between the AberDart and Fennema varieties. However, there was a tendency (P = 0·07) for lambs rotationally grazing the AberDart swards to have a higher final live weight than lambs grazing the Fennema swards. Overall, lamb performance was increased when either perennial ryegrass variety was rotationally rather than continuously grazed (P < 0·001).

AB - Plant breeding has developed perennial ryegrass varieties with increased concentrations of water-soluble carbohydrates (WSCs) compared with conventional varieties. Water-soluble carbohydrates are major metabolic and storage components in ryegrass. Therefore, if perennial ryegrass herbage is allowed to grow to greater heights it should contain higher water-soluble carbohydrates concentrations, for example as under rotational grazing rather than continuous grazing by livestock. This study investigated this hypothesis and measured the performance of lambs grazed rotationally and continuously. Replicated plots of the variety AberDart (bred to express high WSC concentrations) or the variety Fennema were grazed by a core group of ten male Cheviot lambs for 10 weeks. Lambs were weighed and replicate forage samples were taken every 7 d. Concentrations of WSC in AberDart herbage were significantly (P < 0·05), but not substantially, higher than those in Fennema herbage. Rotational grazing did not increase the differential in WSC concentration between the AberDart and Fennema varieties. However, there was a tendency (P = 0·07) for lambs rotationally grazing the AberDart swards to have a higher final live weight than lambs grazing the Fennema swards. Overall, lamb performance was increased when either perennial ryegrass variety was rotationally rather than continuously grazed (P < 0·001).

KW - water-soluble carbohydrate

KW - lolium perenne

KW - grazing systems

KW - sweetgrass

UR - http://hdl.handle.net/2160/35267

U2 - 10.1111/j.1365-2494.2007.00582.x

DO - 10.1111/j.1365-2494.2007.00582.x

M3 - Article

VL - 62

SP - 255

EP - 264

JO - Grass and Forage Science

JF - Grass and Forage Science

SN - 0142-5242

IS - 3

ER -

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