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Beef production from grass and silage with autumn-born calves. 1. The influence of grazing intensity on efficiency of herbage utilization and live-weight gain of cattle

Published online by Cambridge University Press:  02 September 2010

J. M. Wilkinson  and
J. H. D. Prescott
J. M. Wilkinson
Affiliation:
School of Agriculture, The University, Newcastle upon Tyne
J. H. D. Prescott
Affiliation:
School of Agriculture, The University, Newcastle upon Tyne
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Summary

1. Two experiments are described in which groups of 12 autumn-born calves were strip-grazed at different intensities. In Experiment 1 (1966), ‘standard’ and ‘high’ grazing intensities were compared. In Experiment 2 (1967), ‘standard’ and ‘low’ intensities were compared. In both experiments the same meadow fescue—ryegrass ley provided 0·24 ha per head for grazing and conservation; herbage surplus to grazing requirements was conserved as silage.

2. The grazing season was divided into three parts according to the type of grazing, and estimates were made of daily herbage allowances, herbage quality, efficiency of herbage utilization and the live-weight gain of the cattle.

3. Grazing intensity was regulated by controlling daily herbage allowances by strip-grazing. Within grazing seasons, differences in grazing intensity had little effect on the digestibility of the herbage dry matter on offer. Dead herbage accumulation was low (10%) in the early and late parts of the season, but rose to 25% in mid-season.

4. The efficiency of herbage utilization was estimated in three ways: from sample cuts of herbage on offer and refused; from measurements of herbage intake; and from feeding standards for maintenance and gain. Efficiency was highest for the ‘high’ group of Experiment 1 and lowest for the ‘low’ group of Experiment 2. The validity of efficiency estimates is discussed in relation to measurements of pasture yield, herbage intake and the assessment of the nutrient requirements of growing cattle.

5. Live-weight gain over the whole season was 0·59 and 0·89 kg/head per day for the ‘high’ and ‘standard’ groups of Experiment 1, respectively. In Experiment 2, the ‘low’ and ‘standard’ groups gained weight at 0·95 and 0·84 kg/head per day, respectively.

Type
Research Article
Information
Animal Production , Volume 12 , Issue 3 , August 1970 , pp. 433 - 442
Copyright
Copyright © British Society of Animal Science 1970

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References

REFERENCES

Alder, F. E. and Newton, J. E. 1964. Utilization of pasture by beef cattle at various levels of nitrogen and at different stocking rates under irrigation. Exps Prog. Grassld Res. Inst. No. 17, pp. 85–86.Google Scholar
Agricultural Research Council. 1965. The Nutrient Requirements of Farm Livestock. No. 2. Ruminants. Agricultural Research Council, London.Google Scholar
Back, H. L. 1968. An evaluation of an electronic instrument for pasture yield estimation. 1. General relationships. J. Br. Grassld Soc. 23: 216–222.CrossRefGoogle Scholar
Back, H. L., Alder, F. E. and Gibbs, B. G. 1969. An evaluation of an electronic instrument for pasture yield estimation. 2. Use with double sampling for regression estimation. J. Br. Grassld Soc. 24: 168–172.CrossRefGoogle Scholar
Baker, H. K. and Baker, R. D. 1965. A pilot study of an intensive system of beef production from grass. Part 1. Tech. Rep. Grassld Res. Inst., No. 2.Google Scholar
Baker, R. D. 1964. Grassland recording. III. A reappraisal of the use of livestock and starch-equivalent standards in assessing the utilized production from grassland. J. Br. Grassld Soc. 19: 149–155.CrossRefGoogle Scholar
Baker, R. D. 1968. A pilot study of an intensive system of beef production from grass. Part 2. The effect of modifications to the system. Tech. Rep. Grassld Res. Inst., No. 6.Google Scholar
Baker, R. D., Spedding, A. W., Kilkenny, J. B. and Tayler, J. C. 1967. An intensive system of beef production from grassland using autumn-born calves from the dairy herd. Joint Beef Production Committee, Handbook No. 1.Google Scholar
Campbell, A. G., Phillips, D. S. M. and O'Reilly, E. D. 1962. An electronic instrument for pasture yield estimation. J. Br. Grassld Soc. 17: 89–100.Google Scholar
Conway, A. 1968. Grazing management in relation to beef production. IV. Effect of seasonal variation in the stocking rate of beef cattle on animal production and on sward consumption. Ir. J. agric. Res. 7: 93–104.Google Scholar
Eyles, D. E., Williams, T. E. and Green, J. O. 1956. The influence of seasonal intensity of stocking on the liveweight increase from a sward. Proc. Brit. Soc. Anim. Prod., pp. 91–106.Google Scholar
Grassland Research Institute. 1961. Research Techniques in use at the Grassland Research Institute. Bull. Commw. Bur. Past. Fid Crops, No. 45.Google Scholar
Greenhalgh, J. F. D., Reid, G. W. and Aitken, J. N. 1967. The effects of grazing intensity on herbage consumption and animal production. II. Longer-term effects in strip-grazed dairy cows. J. agric. Sci., Camb. 69: 217–223.CrossRefGoogle Scholar
Hodgson, J. and Wilkinson, J. M. 1967. The relationship between live-weight and herbage intake in grazing cattle. Anim. Prod. 9: 365–376.Google Scholar
Holmes, W., Jones, J. G. W. and Adeline, C. 1966. The feed intake of grazing cattle. IV. A study with milk cows of the influence of pasture restriction combined with supplementary feeding on production per animal and per acre. Anim. Prod. 8: 47–57.Google Scholar
Holmes, W., Jones, J. G. W. and Drake-Brockman, R. M. 1961. The feed intake of grazing cattle. II. The influence of size of animal on feed intake. Anim. Prod. 3: 251–260.CrossRefGoogle Scholar
Kilkenny, J. B. 1966. Commercial beef production. Tech. Rep. Beef Rec. Assn, No. 4.Google Scholar
Line, C. 1959. The value of herbage estimates in animal production experiments. In The Measurement of Grassland Productivity (ed. Ivins, J. D.), Butterworths, London.Google Scholar
McCarrick, R. B. 1967. The growth and body composition of beef cattle fed conserved fodders. In Fodder Conservation (ed. Wilkins, R. J.). Occ. Symp. Br. Grassld Soc, No. 3, pp. 121–129.Google Scholar
Meadowcroft, S. C. 1969. Nitrogen and stocking rate for grazing beef cattle. Anim. Prod. 11: 274 (Abstr.).Google Scholar
Spedding, C. R. W. 1966. The grazing sheep in relation to its environment. Proc. 9th Int. Congr. Anim. Prod., Edinburgh, pp. 174–187.Google Scholar
Tayler, J. C. 1966. A critical appraisal of pasture/animal relationships in the grazing management of beef cattle. Ph.D. Thesis, Univ. Reading.Google Scholar
Wheeler, J. L., Reardon, T. F. and Lambourne, L. J. 1963. The effect of pasture availability and shearing stress on herbage intake of grazing sheep. Aust. J. agric. Res. 14: 364–372.CrossRefGoogle Scholar