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The comparative effects of defoliation, treading and excreta on a Lolium perenne-Trifolium repens pasture grazed by sheep

Published online by Cambridge University Press:  27 March 2009

M. L. Curll  and
R. J. Wilkins
M. L. Curll
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berkshire, SL6 5LR
R. J. Wilkins
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berkshire, SL6 5LR
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Summary

The effects of treading and the return of excreta on a Lolium perenne-Trifolium repens sward defoliated by sheep set-stccked at high and low stocking rates were examined. Sward performance was measured inside ‘graze-through’ cages which allowed defoliation without treading and excreta return, and outside where sheep grazed either fitted with harness to prevent the return of excreta or unharnessed to allow the normal return of excreta. Live-weight gain was measured from excreta return and non-return swards. The treatments imposed had large effects on herbage growth and botanical composition.

At a stocking rate of 25 yearling wethers/ha, sheep excreted about 1·1 kg N/ha/day, which increased soil N and led to an increase in herbage growth of about 26 %. The return of excreta increased ryegrass tiller density and this was partly responsible for a 26% reduction in the proportion of clover in the sward; the weight of clover was 13% loss where excreta were returned, and on this treatment stolon length at the end of the experiment was similar to that at the beginning. Doubling the stocking rate increased the N returned via excreta to about 1·3 kg N/ha/day, and this increased herbage growth by 53% but suppressed the proportion of clover by 21%, though not the weight of clover. Clover stolon length decreased during the experiment at this stocking rate, both with and without the return of excreta. Sheep live-weight change benefited from the stimulus to herbage growth where excreta were returned at the high stocking rate, but not at the low stocking rate.

Treading by 25 sheep/ha increased soil compaction but had no significant (P > 0·05) overall effect on herbage growth and botanical composition. However, treading by double the number of grazing animals significantly reduced herbage growth by 10%, plant root weight by 47% and the proportion of clover in the sward by 11%.

Differences in sward performance between stocking rates were due more to the difference in defoliation intensity between these stocking rates than to either treading or the return of excreta.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 100 , Issue 2 , April 1983 , pp. 451 - 460
Copyright
Copyright © Cambridge University Press 1983

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References

Arnold, G. W. (1964). Factors within plant associations affecting the behaviour and performance of grazing animals. In Grazing in Terrestrial and Marine Environments (ed. Crisp, B. J.), pp. 133–154. Oxford: Blackwell.Google Scholar
Arnold, G. W. & Bush, I. G. (1963). Equipment for nutritional studies on grazing animals. C.S.I.R.O. Field Station Record 2, 59–62.Google Scholar
Association of Official Agricultural Chemists (1965). Official Methods of Analysis (10th edn). Washington: A.O.A.C.Google Scholar
Brown, K. R. (1968). The influence of herbage height at treading and treading intensity on the yields and botanical composition of a perennial ryegraas-white clover pasture. New Zealand Journal of Agricultural Research 11, 131–137.CrossRefGoogle Scholar
Brown, K. R. & Evans, P. S. (1973). Animal treading – a review of the work of the late D. B. Edmond. New Zealand Journal of Experimental Agriculture 1, 217–226.CrossRefGoogle Scholar
Cammell, S. B. (1977). Equipment and techniques used for research into intake and digestion of forages by sheep and calves. Technical Report no. 24. Hurley: Grassland Research Institute.Google Scholar
Campbell, N. A. & Arnold, G. W. (1973). The visual assessment of pasture yield. Australian Journal of Experimental Agriculture and Animal Husbandry 13, 263–267.CrossRefGoogle Scholar
Edmond, D. B. (1958 a). The influence of treading on pasture. A preliminary study. New Zealand Journal of Agricultural Research 1, 319–328.Google Scholar
Edmond, D. B. (1958 b). Some aspects of soil physical conditions in ryegrass growth. New Zealand Journal of Agricultural Research 1, 652–659.CrossRefGoogle Scholar
Edmond, D. B. (1966). The influence of treading on pasture growth. Proceedings of the Xth International Grasslands Congress, pp. 453–458.Google Scholar
Floate, M. J. S. (1970 a). Decomposition of organic materials from hill soils and pastures. 2. Comparative studies on the mineralization of carbon, nitrogen and phosphorus from plant materials and sheep faeces. Soil Biology and Biochemistry 2, 173–185.CrossRefGoogle Scholar
Floate, M. J. S. (1970 b). Decomposition of organic materials from hill soils and pastures. 3. The effect of temperature on the mineralization of carbon, nitrogen and phosphorus from plant materials and sheep faeces. Soil Biology and Biochemistry 2, 187–196.CrossRefGoogle Scholar
Floate, M. J. S. (1970 C). Decomposition of organic materials from hill soils and pastures. 4. The effect of moisture content on the mineralization of carbon, nitrogen and phosphorus from plant materials and sheep faeces. Soil Biology and Biochemistry 2, 275–283.CrossRefGoogle Scholar
Frame, J. (1965). The effect of cutting and grazing techniques on the productivity of grass/clover swards. Proceedings of the IXth International Grasslands Congress, pp. 1511–1516.Google Scholar
Frame, J. (1976). A comparison of herbage production under cutting and grazing. In Pasture Utilization by the Grazing Animal, pp. 39–49. Occasional Symposium no. 8, British Grassland Society.Google Scholar
Garwood, E. A., Tyson, K. C. & Clement, C. R. (1977). A comparison of yield and soil conditions during 20 years of grazed grass and arable cropping. Technical Report no. 21, Grassland Research Institute, Hurley.Google Scholar
Hodgson, J. (1979). Nomenclature and definitions in grazing studies. Grass and Forage Science 34, 11–18.CrossRefGoogle Scholar
McIntyre, G. A. (1952). A method of unbiased selective sampling using ranked sets. Australian Journal of Agricultural Research 3, 385–390.CrossRefGoogle Scholar
Moore, R. M., Bakrie, N., Kipps, E. A. & McIntyre, G. A. (1946). Grazing Management. Bulletin 201. Melbourne: C.S.I.R.O.Google Scholar
Sears, P. D. & Evans, L. T. (1953). Pasture growth and soil fertility. III. The influence of red and white clovers, superphosphate, lime and dung and urine on soil composition, and on earthworm and grass grub populations. New Zealand Journal of Science and Technology 35 A, 42–52.Google Scholar
Sears, P. D. & Goodall, V. C. (1942). Apparatus for the collection of urine and faeces from grazing sheep. New Zealand Journal of Science and Technology 23 A, 301–304.Google Scholar
Sears, P. D., Goodall, V. C. & Newbold, R. P. (1948). The effect of sheep droppings on yield, botanical composition and chemical composition of pasture. 2. Results for the years 1942–44 and final summary of the trial. New Zealand Journal of Science and Technology 30 A, 231–250.Google Scholar
Sears, P. D. & Newbold, R. P. (1942). The effect of sheep droppings on yield, botanical composition and chemical composition of pasture. 1. Establishment of trial, technique of measurement and results for the 1940–41 season. New Zealand Journal of Science and Technology 24 A, 36–61.Google Scholar
Sears, P. D. & Thurston, W. B. (1953). Effects of sheep droppings on yield, botanical composition and chemical composition of pasture. 3. Results of field trial at Lincoln, Canterbury, for the years 1944–47. New Zealand Journal of Science and Technology 34, 445–459.Google Scholar
Smith, A., Arnott, R. A. & Peacock, J. M. (1971). A comparison of the growth of a cut sward with that of a grazed sward, using a technique to eliminate fouling and treading. Journal of the British Grassland Society 26, 157–162.Google Scholar
Watkin, B. R. (1954). The animal factor and levels of nitrogen. Journal of the British Grassland Society 9, 35–46.CrossRefGoogle Scholar
Watkin, B. R. (1957). The effect of dung and urine and interactions with applied N, P, K on the chemical composition of pasture. Journal of the British Grassland Society 12, 264–277.CrossRefGoogle Scholar
Wheeler, J. L. (1958). The effect of sheep excreta and nitrogenous fertilizer on the botanical composition and production of a ley. Journal of the British Grassland Society 13, 196–202.CrossRefGoogle Scholar
Whitehead, D. C. (1970). The Role of Nitrogenin Grassland Productivity. Bulletin 48. Farnham Royal: Commonwealth Agricultural Bureaux.Google Scholar
Wolton, K. M. (1955). The effect of sheep excreta and fertilizer treatments on the nutrient status of pasture soils. Journal of the British Grassland Society 10, 240–253.CrossRefGoogle Scholar
Wolton, K. M. (1963). An investigation into the simulation of nutrient returns by the grazing animal in grassland experimentation. Journal of the British Grassland Society 18, 213–219.CrossRefGoogle Scholar