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Seasonal and management effects on the composition and availability of herbage, steer diet and live-weight gains in a Themeda triandra grassland in Kenya. II. Results of herbage studies, diet selected and live-weight gains

Published online by Cambridge University Press:  27 March 2009

A. D. Mckay
A. D. Mckay
Affiliation:
East African Agriculture and Forestry Research Organization, Muguga, Kenya
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Summary

The environment, design and methods of this 2-year Kedong grazing trial in the Rift Valley of Kenya were described in Part I.

Crude protein of grasses varied seasonally, usually between 3 and 6 %, while most shrubs and herbs, leguminous and non-leguminous, were in the 10–20 % range, although contributing only about 3 % by weight of the total sward, excluding large bushes and trees. Steers selected herbage of 2–3 % units higher C. P., more Themeda leaf and more herbs than the sward average. Treatment effects on sward and diet C. P., and their relationships, were generally small and inconsistent. Higher C. P. in post-burning ro-growth declined to average levels after 2–3 months, except when grazed at one steer to 4–4 acres, rotational (i.e. 1–5 acres available). At this pressure available herbage fell below 1000 lb D.M./acre (1120 kg/ha). In all other treatments 2500–4500 lb D.M./acre wore available at all times. Estimated herbage production varied from almost nil to 320 lb D. M./acre/month. Burning removed 3000 lb D.M./acre. Relationships between herbage C. P., diet c. p. (oesophageal fistula samples) and faeces N were determined.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 76 , Issue 1 , February 1971 , pp. 9 - 26
Copyright
Copyright © Cambridge University Press 1971

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References

REFERENCES

Agricultural Research Council (1965). The Nutrient Requirements of Farm Livestock No. 2. Ruminants. London: A.R.C.Google Scholar
Bredon, R. M., Harker, K. W. & Marshall, B. (1963). The nutritive value of grasses grown in Uganda when fed to Zebu cattle. 1. The relation between the percentage of crude protein and other nutrients. J. agric. Sci., Camb. 61, 101.Google Scholar
Bredon, R. M., Torell, D. T. & Marshall, B. (1967). Measurement of selective grazing of tropical pastures using oesophageal fistulated steers. J. Range Mgmt. 20, 317.CrossRefGoogle Scholar
Davtes, J. M. (1965). Ann. Rep. Inst. for Agric. Res., Samaru (N. Nigeria), pp. 48–49.Google Scholar
Dhadu, E. (1967). Ann. Rep. Anim. Prod. Divn, Animal Health Research Centre, Entebbe.Google Scholar
Glover, J., Duthie, D. W. & French, M. H. (1957). The apparent digestibility of crude protein by the ruminant. 1. A synthesis of the results of digestibility trials with herbage and mixed feeds. J. agric. Sci., Camb. 48, 373.CrossRefGoogle Scholar
Kennan, T. C. D. (1962). Veld management in the semi-intensive, semi-extensive and extensive farming areas of S. Rhodesia. Proc. 1st Inter-departmental Conf. of Pasture Workers, Bulawayo, pp. 74–91. (Cyclostyled.)Google Scholar
Mckay, A. D. (1968). Rangeland productivity in Botswana. E. afr. agric. For. J. 34, 178.CrossRefGoogle Scholar
Mcmeekan, C. P. & Walshe, M. J. (1963). The interrelationships of grazing method and stocking rate in the efficiency of pasture utilisation by dairy cattle. J. agric. Sci., Camb. 61, 147.CrossRefGoogle Scholar
Norman, M. J. T. (1960). Grazing and Feeding Trials with Beef Cattle at Katherine, N.T. Tech. paper 12, Land Resources Regional Survey, C.S.I.R.O., Australia.Google Scholar