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The effect of reduced leaf shear strength on the nutritive value of perennial ryegrass

Published online by Cambridge University Press:  27 March 2009

B. W. Mackinnon ,
H. S. Easton ,
T. N. Barry  and
J. R. Sedcole
B. W. Mackinnon
Affiliation:
Department of Animal Science Massey UniversityPalmerston North, New Zealand
H. S. Easton
Affiliation:
Grasslands DivisionD.S.I.R., Palmerston NorthNew Zealand
T. N. Barry
Affiliation:
Department of Animal Science Massey UniversityPalmerston North, New Zealand
J. R. Sedcole
Affiliation:
Applied Mathematics DivisionD.S.I.R.Palmerston NorthNew Zealand
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Summary

Progeny of perennial ryegrass (PRG) plants selected for low and high leaf shear strength were sown in a spaced-plant field experiment and were shown to differ in leaf strength in the same direction, confirming this to be a heritable trait. Selection for low leaf shear strength also reduced weight per leaf length, but had no effect on dry-matter (D.M.) percentage, growth score, rust score or tendency towards aftermath heading.

Rates of D.M. consumption (g D.M./min) and ruminal degradation of D.M. using the polyester bag technique, were then determined with small quantities of the two PRG selection lines, and also white clover, using sheep fed a basal diet of fresh ryegrass/white clover pasture. Selecting PRG for low leaf shear strength slightly reduced concentrations of cellulose and hemicellulose, slightly increased total N concentration and increased rate of D.M. consumption by sheep (17%) but had no effect on rates of ruminal D.M. degradation. The selection thus moved the nutritional characteristics of PRG in the direction of white clover.

The first nutritional response to the selection appears to be a faster rate of D.M. consumption, and it is considered that leaf shear strength has potential for selecting PRG with increased rates of voluntary intake by ruminants.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 111 , Issue 3 , December 1988 , pp. 469 - 474
Copyright
Copyright © Cambridge University Press 1988

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References

Bailey, R. W. (1964). Pasture quality and ruminant nutrition. I. Carbohydrate composition of ryegrass varieties grown as sheep pastures. New Zealand Journal of Agricultural Research 7, 496–507.CrossRefGoogle Scholar
Beever, D. E., Dhanoa, M. S., Losada, H. R., Evans, R. T., Cammell, S. B. & France, J. (1986). The effect of forage species and stage of harvest on the processes of digestion occurring in the rumen of cattle. British Journal of Nutrition 56, 439–54.CrossRefGoogle ScholarPubMed
Betteridge, G. P., Tallon, J. L., Staines, M. P., Buckley, R. G., Bryan, H. T. & Stevenson, I. G. (1985). An interim report on the tensile properties of four forage grasses. Internal Report, Physics and Engineering Laboratory, Department of Scientific and Industrial Research, Wellington, New Zealand.Google Scholar
Black, J. C., Faichney, G. J. & Sinclair, R. E. (1982). Role of computer simulation in overcoming limitations to animal production from pastures. In Nutritional Limits to Animal Production from Pastures (ed. Hacker, J. B.), pp. 473–493. Farnham Royal: Commonwealth Agricultural Bureaux.Google Scholar
Cooper, J. P., Tilley, J. M. A., Raymond, W. F. & Terry, R. A. (1962). Selection for digestibility in herbage grasses. Nature 195, 1276–1277.Google Scholar
Dennis, B. & Frandsen, K. J. (1986). Breeding for improved digestibility in temperate forage grasses. In Plant Breeding Symposium (ed. Williams, T. A. and Wratt, G. M.), pp. 291–294. New Zealand Agronomy Society, Special Publication No. 5.Google Scholar
Easton, H. S. (1988). Variability of leaf shear strength in perennial ryegrass. New Zealand Journal of Agricultural Research (in the Press).Google Scholar
Evans, P. S. (1967 a). Leaf strength studies of pasture grasses. I. Apparatus, techniques and some factors affecting leaf strength. Journal of Agricultural Science, Cambridge 69, 171–174.Google Scholar
Evans, P. S. (1967 b). Leaf strength studies of pasture grasses. II. Strength, cellulose content and sclerenchyma tissue proportions of eight grasses grown as single plants. Journal of Agricultural Science, Cambridge 69, 175–181.Google Scholar
Lancashire, J. A. & Ulyatt, M. J. (1975). Liveweight gains of sheep grazing ryegrass pastures with different cellulose contents. New Zealand Journal of Agricultural Research 18, 97–100.CrossRefGoogle Scholar
Mehrez, A. Z. & Ørskov, E. R. (1977). A study of artificial fibre bag technique for determining the digestibility of feeds in the rumen. Journal of Agricultural Science, Cambridge 88, 645–650.Google Scholar
Ørskov, E. R. & McDonald, I. (1979). The estimation of protein degradability in the rumen from incubation measurements weighted according to rate of passage. Journal of Agricultural Science, Cambridge 92, 499–503.Google Scholar
Thornton, R. F. & Minson, D. J. (1973). The relationship between apparent retention time in the rumen, voluntary intake and apparent digestibility of legume and grass diets in sheep. Australian Journal of Agricultural Research 24, 889–898.Google Scholar
Ulyatt, M. J. (1971). Studies on the causes of the differences in pasture quality between perennial ryegrass, shortrotation ryegrass and white clover. New Zealand Journal of Agricultural Research 14, 352–367.Google Scholar
Ulyatt, M. J., Dellow, D. W., John, A., Reid, C. S. W. & Waghorn, G. C. (1986). Contribution of chewing during eating and rumination to the clearance of digesta from the reticulo-rumen. In Control of Digestion and Metabolism in Ruminants (ed. Milligan, L. P., Grovum, W. L. and Dobson, A.), pp. 498–515. Engelwood Cliffs, New Jersey, U.S.A.: Prentice Hall.Google Scholar
Voisey, P. W. (1976). Engineering assessment and critique of instruments used for meat tenderness evaluation. Journal of Texture Studies 7, 11–48.CrossRefGoogle Scholar
Waghorn, G. C. & Barry, T. N. (1987). Digestion and absorption of nutrients. In Nutrition of the Grazing Ruminant (ed. Nicol, A. M.), pp. 21–37. Occasional Publication No. 10, NZ Society of Animal Production.Google Scholar
Weston, R. H. (1985). The regulation of feed intake in herbage-fed ruminants. Proceedings of the Nutrition Society of Australia 10, 55–62.Google Scholar
Wilson, D. (1965). Nutritive value and genetic relationship of cellulose content and tensile strength in Lolium. Journal of Agricultural Science, Cambridge 65, 285–292.CrossRefGoogle Scholar