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An assessment of the influence on net herbage accumulation, herbage consumption and individual animal performance of two lengths of grazing rotation and three herbage allowances for grazing beef cattle

Published online by Cambridge University Press:  27 March 2009

P. W. Bartholomew ,
W. McLauchlan  and
D. M. B. Chestnutt
P. W. Bartholomew
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down
W. McLauchlan
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down
D. M. B. Chestnutt
Affiliation:
The Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down
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Summary

Over three grazing seasons a sward of perennial ryegrass, cv. Gremie, was grazed on a rotational paddock system by growing beef cattle weighing on average 185·5 kg when turned out to grass in April. Six grazing treatments were compared: grazing at 20- or 35-day intervals at each of three herbage allowances of 5·3, 4·3 and 3·3 kg grass D.M./100 kg live weight (4·0, 3·2 and 2·4 kg D.M./IOO kg live weight in the 1st year).

Measurements of net herbage accumulation and herbage consumption throughout each grazing season were made by taking grass sampling clips to ground level before and after grazing. Animal live-weight gain was assessed by regression on weighings of stock taken either every 7 or every 4 days depending on regrowth interval treatment. Adjustment of allocation treatment was made by varying the weight of stock grazing on a fixed paddock area.

In no year did annual net herbage organic-matter accumulation (NHA) differ significantly according to length of grazing interval. NHA showed a 4·7 % advantage for the longer interval in the first 2 years which changed to a deficit of 4·1 % in the final year of the experiment. Herbage allowance treatment produced no significant effect on NHA in any year. The interaction effect of herbage allowance and grazing interval was not significant.

Herbage consumption was greater in 2 years out of three under the 20-day regrowth period than with the 35-day treatment, although average degree of defoliation was slightly greater (44·0 v. 38·4%) with the longer interval.

Animal live-weight gain was significantly (P < 0·05) affected by herbage allowance in all 3 years; decreasing herbage allowance generally resulted in reduced live-weight gain. Only in 1 year was there a significant difference (P < 0·001) in live-weight gain with the different rotation length treatments.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 96 , Issue 2 , April 1981 , pp. 363 - 373
Copyright
Copyright © Cambridge University Press 1981

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References

REFERENCES

Anslow, R. C. (1968). The production of dry matter by swards of perennial ryegrass differing in average age of foliage. Journal of the British Grassland Society 23, 195–201.CrossRefGoogle Scholar
Baker, R. D. (1975). Effect of sward characteristics on herbage intake under grazing – nutritive quality, species and amount. In Pasture Utilization by the Grazing Animal. Occasional Symposium No. 8, British Grassland Society, pp. 87–92.Google Scholar
Bartholomew, P. W. & Chestnutt, D. M. B. (1977). The effect of a wide range of fertilizer nitrogen application rates and defoliation intervals on the dry-matter production, seasonal response to nitrogen, persistence and aspects of chemical composition of perennial ryegrass (Lolium perenne cv. S.24). Journal of Agricultural Science, Cambridge 88, 711–721.CrossRefGoogle Scholar
Binnie, R. C., Chestnutt, D. M. B. & Murdoch, J. C. (1980). The effect of time of initial defoliation and height of defoliation on the productivity of perennial ryegrass swards. Grass and Forage Science (in the Press).CrossRefGoogle Scholar
Hodgson, J. & Wade, M. H. (1978). Grazing management and herbage production. In Grazing: Sward Production and Livestock Output. Proceedings British Grassland Sooiety winter meeting. 12 1978 pp. 1.1.12.Google Scholar
Holliday, R. & Wilman, D. (1965). The effect of fertilizer nitrogen and frequency of defoliation on yield of grassland herbage. Journal of the British Grassland Society 20, 32–40.CrossRefGoogle Scholar
Hunt, L. A. (1965). Some implications of death and decay in pasture production. Journal of the British Grassland Society 20, 27–31.CrossRefGoogle Scholar
Leaver, J. D. (1975). Rearing of dairy cattle. 6. The effect of length of grazing rotation on animal and herbage production in a grazing system for calves and heifers. Animal Production 21, 157–164.Google Scholar
McFeely, P. C. & Browne, D. (1974). The effect of grazing interval on liveweight gain and carcass weight. 12th International Grassland Congress, Moscow (1974), pp. 398–407.Google Scholar
Marsh, R. (1975). Systems of grazing management for beef cattle. In Pasture Utilization by the Grazing Animal. Occasional Symposium No. 8, British Grassland Society, pp. 119–128.Google Scholar
Minson, D. J., Harris, C. E., Raymond, W. F. & Milford, R. (1964). The digestibility and voluntary intake of S.22 and H.1 ryegrass, S.170 Tall fescue, S. 48 Timothy, S. 215 Meadow fescue and Gominal Cocksfoot. Journal of the British Grassland Society 19, 298–305.CrossRefGoogle Scholar
Reid, D. (1962). Studies on the cutting management of grass-clover swards. III. The effects of prolonged close and lax cutting on herbage yields and quality. Journal of Agricultural Science, Cambridge 59, 359–368.CrossRefGoogle Scholar
Roberts, R. A. & Hunt, I. V. (1936). The effect of shoot cutting on the growth of root and shoot of perennial ryegrass (Lolium perenne L.) and of Timothy (Phleum pratense L.). Welsh Journal of Agriculture 12, 159–174.Google Scholar
Wilman, D., Droushiotis, D., Koocheki, A., Lwoga, A. B. & Shim, J. S. (1976). The effect of interval between harvests and nitrogen application on the digestibility and digestible yield and nitrogen content and yield of four ryegrass varieties in the first harvest year. Journal of Agricultural Science, Cambridge 86, 393–399.CrossRefGoogle Scholar
Woodman, H. E., Norman, D. B. & Bee, J. W. (1929). Nutritive value of pasture. IV. The influence of the intensity of grazing on the yield, composition and nutritive value of pasture herbage (Part II). Journal of Agricultural Science, Cambridge 19, 236–265.CrossRefGoogle Scholar