The Output of Pasture and Its Measurement

Linehan, Peter; Lowe, J.; Stewart, R. H.

doi:10.1111/j.1365-2494.1952.tb01305.x

Cited by 18 publications

(2 citation statements)

References 14 publications

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“…Normally it involves comparisons of clipped quadrat, individual plant or plant-part samples taken just before and just after grazing, or comparisons of such samples cut in areas being grazed (or which have been grazed) with samples cut in comparable areas from which the grazing animals have been excluded. In the latter instance cages or exclosures are used to exclude the animals, and the technique in its different variants is termed the "cage" method, "movable cage" method or the "exclosure" method (see Nevens, 1945;Linehan, Lowe & Stewart, 1952;Brown, 1954;Voight, 1959).…”

Section: Difference Methodsmentioning

confidence: 99%

“…Grazed pastures with exclosures Adjustment of consumption by the amount of growth made in the exclosures implies that the growth rate of the pasture in the exclosures is the same as that in the grazed area. This assumption is somewhat arbitrary, and, in circumstances where growth must be allowed for, Linehan et al (1952) suggested the use of the following formula to estimate consumption (A). It is based on the premise that the rate of consumption of grass by stock and the rate of herbage growth at any time during the grazing period are each proportional to the quality of herbage remaining uneaten at this time.…”

Section: Difference Methodsmentioning

confidence: 99%

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A review of plant‐based methods of estimating food consumption, percentage utilisation, species preferences and feeding patterns of grazing and browsing animals

Barnes

1976

Proceedings of the Annual Congresses of the Grassland Society o

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Section: Difference Methodsmentioning

confidence: 99%

Section: Difference Methodsmentioning

confidence: 99%

A review of plant‐based methods of estimating food consumption, percentage utilisation, species preferences and feeding patterns of grazing and browsing animals

Barnes

1976

Proceedings of the Annual Congresses of the Grassland Society o

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Accuracy Analysis with Special Reference to the Prediction of Grassland Yield

Allen

Raktoe

1981

Biometrical J

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In this paper technique8 are presented which allow the evaluation of accuracy of prediction methoda, with special reference to the prediction of gradand yield. The more prominent methods of predicting graeeland yield are diecussed. Two coefficients, which are normalizatione of the mean-aquared-error, are propoaed 8s measure8 of accnracy. It ia shown that the man-squarederror partitiom into the w m of three meaningful componenta of error. The diatribution of the componenta is diecussed under the aaanmption that the actual and predicted yielde have a bivariate normal diatribution. The problem of accuracy analysis is addreeeed when one is only interested in ranking the yields of graesland 8re.U. The ratio of the mean-squared-error for two competing prediction methods ie inveetigated. Finally, a multiplicative model ie studied which allow8 predicting ability to differ over time or over region& Key words: Accuracy analysis, relative accuracy, Theil's h p o s i t i o n of error, ped&%on of graashnd yield, t a t s of h y p o t h k , Speurman~s rank correkztion, Kendall's r coefficient, mdtiplicative dhxnnpsitiOn.

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The Quantities of Herbage Eaten by Grazing Dairy Cows

MacLusky

1955

Proceedings of the British Society of Animal Production

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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.

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The Output of Pasture and Its Measurement

Cited by 18 publications

References 14 publications

A review of plant‐based methods of estimating food consumption, percentage utilisation, species preferences and feeding patterns of grazing and browsing animals

A review of plant‐based methods of estimating food consumption, percentage utilisation, species preferences and feeding patterns of grazing and browsing animals

Accuracy Analysis with Special Reference to the Prediction of Grassland Yield

The Quantities of Herbage Eaten by Grazing Dairy Cows

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