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Effects of leaf shear breaking load on the feeding value of perennial ryegrass (Lolium pevenne) for sheep. II. Effects on feed intake, particle breakdown, rumen digesta outflow and animal performance

Published online by Cambridge University Press:  27 March 2009

T. Inoué ,
I. M. Brookes ,
A. John ,
E. S. Kolver  and
T. N. Barry
T. Inoué
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
I. M. Brookes
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
A. John
Affiliation:
Ag Research, Grasslands Research Centre, Palmerston North, New Zealand
E. S. Kolver
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
T. N. Barry
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
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Summary

A series of experiments was conducted at Palmerston North, New Zealand, during 1988–91 to compare the efficiency of chewing during eating and rumination, rumen fractional outflow rate (FOR), voluntary organic matter intake, liveweight gain and wool production in sheep fed either low (LS) or high (HS) leaf shear breaking load perennial ryegrass (PRG). The LS ryegrass had a 13% lower mean leaf shear breaking load and ingestion rates tended to be higher than for HS PRG, but no consistent significant treatment differences were observed in rate of particle breakdown, rumen FOR, voluntary intake or animal performance. It was concluded that selection for reduced leaf shear breaking load per se did not improve feeding value. The total shear load required to reduce a unit dry weight of PRG leaf to < 1 mm particles (index of masticatory load; IML) differed by only 3% between LS and HS PRG in this study, due to higher leaf length:dry weight ratios for LS PRG. It is therefore suggested that IML, which takes into account both leaf shear breaking load and associated changes in leaf morphology may be a better criterion for selection than leaf shear breaking load alone in breeding programmes to improve the feeding value of perennial ryegrass.

Type
Animals
Information
The Journal of Agricultural Science , Volume 123 , Issue 1 , August 1994 , pp. 137 - 147
Copyright
Copyright © Cambridge University Press 1994

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