A Comparison of Various Digestion Trial Techniques with Dairy Cattle

Kane, E. A.; Ely, Ray E.; Jacobson, W.C.; Moore, L.A.

doi:10.3168/jds.s0022-0302(53)91500-8

Cited by 24 publications

(10 citation statements)

References 21 publications

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“…Lignin has been shown by some workers to be partially digestible in vivo (Ely et al 1953;Kane et al 1953;Elam & Davis, 1961) and these workers considered that losses of lignin due to its digestion limited its usefulness as an internal marker. If both the lignin and cellulose, that is potentially digestible in vivo, could be removed by acid detergent solution extraction followed by digestion in cellulase, then this might enable the remaining fraction, acid detergent fibre that is indigestible in cellulase (IADF), to be used as an internal marker.…”

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confidence: 99%

The use of internal markers to estimate herbage digestibility and intake: 2. Indigestible acid detergent fibre

Penning

Johnson

1983

J. Agric. Sci.

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SUMMARYDigestibility trials were carried out using wether sheep, to determine the organicmatter digestibility of several forages. Acid detergent fibre (ADF) was isolated from samples of feed and faeces, incubated in buffered cellulase solution, and the ash-free residue remaining (IADF) was used as an internal marker to estimate the organicmatter digestibility (OMD) of the feeds. Estimates of the OMD value of the samples were also made using the standard in vitro digestibility technique.IADF had reached a constant value after incubation for 4–5·5 days and predicted OMD more precisely than the in vitro digestibility technique.It is concluded that IADF is a suitable internal marker and predicts OMD well. However, more work is required to test this technique over a wider range of herbage species and digestibilities.

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confidence: 99%

The use of internal markers to estimate herbage digestibility and intake: 2. Indigestible acid detergent fibre

Penning

Johnson

1983

J. Agric. Sci.

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“…which is completely recovered in the faeces. With lignin especially there is highly confiicting evidence about its indigestibility (18). In particular the recovery in faeces of up to 23 per cent more lignin than has been fed in the herbage eaten (9) raises grave doubts of the adequacy of the analytical methods at present in use.…”

Section: Discussionmentioning

confidence: 99%

“…These workers found a digestibility of 10 per cent for lignin in heather, and used this figure to correct intake data for sheep on moorland grazing. KANE et al (18,21), have reviewed the evidence showing 100 per cent recovery of chromic oxide in faeces, and LANCASTER et al (23) have also found good recovery with dairy cows. These recoveries have, however, been obtained with total collections of faeces, and these authors have considered the problem of obtaining faeces samples in the field, where chromic oxide is being used so that total faecal collection is not necessary.…”

Section: Discussionmentioning

confidence: 99%

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Studies in the Digestibility of Herbage

Raymond¹

1954

Grass and Forage Science

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The measurement of pasture output raises many problems, because harvesting is carried out by grazing stock, and yields cannot be measured directly, as with grains, roots, hay and silage. Pasture output is also a function of management, and seasonal yield is frequently of more importance than total annual yield.Methods used in pasture studies have been reviewed and recommendations made by a Committee on pasture research (17). These include the use of 'unit grazing days' [VINALL (35) ], total digestible nutrient output [KNOTT et al. (22)] and mowing techniques, as well as some of the techniques described below. While mowing methods frequently give good agreement with output measured as T.D.N.'s or Starch Equivalent, this is usually only found over prolonged grazing trials, when cumulative output figures are used. Thus LINEHAN et a/. (24) have shown that over a period of three years a clipping method has given an output 101 per cent of that obtained from animal data. During individual grazing periods, however, output from clippings varied from 66 to 252 per cent of animal output. This illustrates the difficulty of evaluation of output over short periods. Some of the reasons for this have been discussed by GREEN (13). who indicated the large numbers of herbage samples that are required to obtain an accurate measure of consumption, and stressed the importance of sampling herbage at a level lower than that to which stock will graze. However, under certain conditions and with the taking of large numbers of samples, useful output data can be obtained: thus WAITE et al.(36) have measured the output of'strip' grazing, under which the errors introduced by differential growth, discussed by LINEHAN (24) are largely eliminated. SEARS (31) has described a method in which herbage in 'protected' areas is plucked until it is similar in appearance to grazed areas, but here allowance for herbage growth during the grazing period is difficult, and the method is basically subjective. The use of a 'browse unit' method has been suggested for range conditions by COOK et al. (3).The use of animal output as a measure of pasture production requires considerable numbers of animals because of individual variations in maintenance and production requirements. Moreover it is uncertain how far standards for maintenance and production, obtained in indoor experiments, are strictly valid in the field. Its application to short grazing periods is doubtful: thus TAYLER (34) has indicated the difficulty in measurement of liveweight increase due to variations in 'fiir. Little is known also about the energy expenditure in grazing.In general, the precision of measurement of pasture output by mowing techniques or animal output data is inadequate and interest is now largely concerned with alternative methods of evaluation. Of these, methods involving collection and chemical analysis of faeces show promise, and are being widely studied. There appear to be two quite distinct approaches in use, namely the use of indigestible tracer substances in the feed and t...

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“…From this they derived a method which gave minimum lignin values which were highly repeatable. A variation of this method has been used by Kane et al (1953); however, their "true" lignin digestibility results were less satisfactory than "crude" lignin results obtained by the method of Ellis et al (19^6). Balch ejb aJ.…”

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confidence: 98%

Effect of dietary energy concentration and level on digestion in the bovine gastrointestinal tract

Nelson

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A Comparison of Various Digestion Trial Techniques with Dairy Cattle

Cited by 24 publications

References 21 publications

The use of internal markers to estimate herbage digestibility and intake: 2. Indigestible acid detergent fibre

The use of internal markers to estimate herbage digestibility and intake: 2. Indigestible acid detergent fibre

Studies in the Digestibility of Herbage

Effect of dietary energy concentration and level on digestion in the bovine gastrointestinal tract

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