Sward conditions, herbage allowance and animal production: an evaluation of research results

J. Hodgson

Hill Farming Research Organisation, Penicuik, Midlothian, Scotland

Proceedings of the New Zealand Society of Animal Production. 1984, 44: 99-104

The evidence on the influence of herbage allowance and sward characteristics upon animal performance and herbage production is reviewed briefly, with particular reference to the prediction of animal performance, the use of decision rules in grazing systems and understanding of animal/sward interrelationships. Attention is concentrated on evidence from temperature grasslands, with particular reference to New Zealand results.

Simple management rules based on herbage allowance or residual dry matter indices have made a major contribution to improvement in the efficiency of grazing management. However, their use as general indices is restricted by the interdependence of the effects of variation in allowance and sward conditions upon animal performance. Furthermore allowance-based studies make only a limited contribution to understanding of the factors influencing the links between the plant and animal components of grazing systems. It is suggested that more attention should now be concentrated on the causative effects of variation in sward characteristics upon both herbage production and animal performance

Keywords: NZSAPAB; Sward; herbage allowance; grazing management; herbage mass; sward height; herbage intake; animal performance; herbage production

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Last Updated 03-05-1997