An Evaluation of an Electronic Instrument for Pasture Yield Estimation

Back, H. L.; Alder, F. E.; Gibbs, Benjamin G.

doi:10.1111/j.1365-2494.1969.tb01064.x

Cited by 23 publications

(14 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Subsequently, an electronic pasture yield estimator was used (Back, Alder and Gibbs, 1969). Two 0-3-m 2 sample quadrats were cut to ground level with hand shears in each paddock during the first grazing cycle.…”

Section: Grazing Season Management and Measurementsmentioning

confidence: 99%

Changes in the body composition of cattle exhibiting compensatory growth and the modifying effects of grazing management

1985

View full text Add to dashboard Cite

Friesian steer calves born in August were reared from 3 to 7 months of age on either a low (OL) or high (OH) plane of nutrition. A further group born in October (YH) was also reared on a high plane. At grazing, the performance of calves of the same age but different weights (OL v. OH) or the same weight but different ages (OL v. YH) were compared at two levels of herbage allowance, either 30 or 60 kg dry matter per kg live weight. During the winter, the H groups received silage and concentrate and the L group was given silage only. The OL group had a higher concentration of fat and a lower concentration of water in the empty body at the end of the winter than did the OH and YH groups respectively.Compensatory growth was exhibited by the OL group at both herbage allowances. Differences in the live-weight and empty body-weight gains of OL and OH cattle could be explained almost entirely by differences in the energy content of the gains whereas this was only partially so when the OL and YH groups were compared. The results indicate that YH cattle had lower herbage intakes even though they were of similar weight to OL cattle.It was concluded that silage nitrogen is used less efficiently by cattle than is generally assumed and that the levels of gut fill and energy content of the live-weight gains in this experiment were not consistent with the general values suggested by the Agricultural Research Council (1980).

show abstract

Section: Grazing Season Management and Measurementsmentioning

confidence: 99%

Changes in the body composition of cattle exhibiting compensatory growth and the modifying effects of grazing management

1985

View full text Add to dashboard Cite

show abstract

“…The various capacitance meters previously mentioned have been extensively field tested with mixed results. Several workers have reported promising results using these devices (Campbell et al, 1962;Alcock and Lovett, 1967;Back, 1968;Van Dyneef a/., 1968;Back et al, 1969;Johns, 1972;Currie et al, 1973;Neal and Neal, 1973) while others have found that there are too many sources of error which prohibit successful field usage of these devices in many field situations (Bryant et al, 1971).…”

Section: Capacitance Metersmentioning

confidence: 99%

A critical review of remote sensing and other methods for non‐destructive estimation of standing crop biomass

Tucker

1980

Grass and Forage Science

101

View full text Add to dashboard Cite

Several different techniques for the non-destructive estimation of pasture or range biomass are critically reviewed and compared to remote sensing methods. Similarities and differences between the visual estimation procedure, )S-attentuation, capacitance meters, weighted disc, and spectral methods are discussed in terms of accuracy, time, ease of operation, operational constraints and calibration procedures. No one technique has been shown to be superior across the board to the other techniques reviewed for ground-based biomass estimatiori. A discussion of the strengths and weaknesses of each non-destructive method allows for the selection of the technique most suited to a particular application.

show abstract

“…Measurements of the amount of herbage present before and after grazing on each treatment were made at weekly intervals, using an electronic pasture yield estimator (2). Local regressions of herbage yield on meter readings were established from five quadrats cut to ground level with hand shears, and 20 extra meter readings were taken on each plot.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Supplementary Barley Upon Growth and Efficiency of Food Conversion in Calves Kept at High Grazing Intensity

Hodgson

Tayler

1972

Grass and Forage Science

View full text Add to dashboard Cite

Three groups of Hereford x Friesian steer calves, bom in early January 1969, were strip-grazed on eqoal areas of a sward of S321 perennial ryegrass from May to September inclusive, and received kibbled barley at the rate of nil, f % or \\% of liveweight per day. Adjustments were made to the number of animals per group in order to maintain the same high grazing intensity (defined as 8 cm stubble height in grazed areas) on all treatments. The animals receiving supplementary barley gained weight at a rate 17-19% higher than the controls, but there was no significant difference in growth rate between the high and low levels of supplementation. The efBdency of conversion of barley was only 5-12 kg per animal liveweight gain/100 kg barley OM.The bigb level of supplementation resulted in an increase in stocking rate of 36 % over tbat of tbe control group, and an increase in liveweigbt gain per unit area of land grazed of 63%. The additional liveweigbt gain due to supplements, expressed per unit area of laiid grazed, was relatively constant at 21-24 kg liveweigbt gain/ 100 kg barley OM consumed.

show abstract

An Evaluation of an Electronic Instrument for Pasture Yield Estimation

Abstract: In situations where yield is variable but in which it is not desirable to take too large a cut sample, e.g. on grazed plots, the pasture‐yield estimator can be used to improve the accuracy of yield estimation. An outline of the theory and examples of the use of the method are given.

Cited by 23 publications

References 3 publications

Changes in the body composition of cattle exhibiting compensatory growth and the modifying effects of grazing management

Changes in the body composition of cattle exhibiting compensatory growth and the modifying effects of grazing management

A critical review of remote sensing and other methods for non‐destructive estimation of standing crop biomass

The Effect of Supplementary Barley Upon Growth and Efficiency of Food Conversion in Calves Kept at High Grazing Intensity

Contact Info

Product

Resources

About