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The Quantities of Herbage Eaten by Grazing Dairy Cows

Published online by Cambridge University Press:  06 May 2016

D. S. MacLusky
Affiliation:
The Hannah Dairy Research Institute, Kirkhill, Ayr
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Extract

The herbage dry matter intake of grazing animals may be estimated by chemical marker and faecal analysis methods (Raymond, 1954) or by pasture sampling methods.

Pasture sampling methods generally involve two main difficulties. The first is the low precision resulting from the variability of pasture yields. When intake is estimated from the difference between the yields of herbage on a given area sampled before and after the grazing period, the estimate bears the error variances of both the sample means. The second difficulty lies in ensuring that the estimated difference in yields is the true difference due to consumption. The samples must be cut below the level to which the animal can graze, and the amount of herbage growth during the grazing period must be estimated and allowed for. Growth can be estimated from the difference between the yield of herbage before grazing and the yield of protected herbage at the end of the grazing period.

Type
Research Article
Copyright
Copyright © The British Society of Animal Production 1955

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References

Cowlishaw, S. J., 1951. The effect of sampling cages on the yields of herbage. J. Brit. Grassl. Soc, 6: 179.CrossRefGoogle Scholar
Jarl, F., 1952. The use of forage in dairy production. Proc. 6th int. Grassl. Congr., 1179.Google Scholar
Linehan, P. A., Lowe, J., & Stewart, R. H., 1952. The output of pasture and its measurement. Pt. 3. J. Brit. Grassl. Soc, 7: 73.CrossRefGoogle Scholar
Raymond, W. F., 1954. Studies in the digestibility of herbage. 3. The use of faecal collection and chemical analysis in pasture studies—(a) ratio and tracer methods. J. Brit. Grassl. Soc, 9: 61.CrossRefGoogle Scholar
Waite, R., Holmes, W., Campbell, , Jean, I., & Fergusson, D. L., 1951. Studies in grazing management. Pt. 3. The amount and chemical composition of herbage eaten by dairy cattle under close-folding and rotational methods of grazing. J. agric Set, 40: 392.CrossRefGoogle Scholar
Williams, , Stella S., , 1951. Microenvironment in relation to experimental techniques. J. Brit. Grassl. Soc, 6: 207.CrossRefGoogle Scholar
Woodman, H. E., 1948. Rations for livestock. Bull. Minist. Agric. (Lond.), No. 48.Google Scholar

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