Dry Matter Disappearance of Roughages in Nylon Bags Suspended in the Rumen

Neathery, M.W.

doi:10.3168/jds.s0022-0302(69)86504-5

Cited by 21 publications

(15 citation statements)

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“…This nylon-bag technique was used by Wilson (1981) to determine the relative solubilities of different dietary magnesium supplements in the bovine rumen in vivo. Various workers have discussed the variables that can affect the results for organic foods in nylon bags (Mehrez and 0rskov, 1977;Neathery, 1969;Van Keuren and Heinemann, 1962), some of which might also apply to inorganic materials. The rumen is now widely believed to be a major site for magnesium absorption in the ruminant digestive tract (Tomas and Potter, 1976;Field and Munro, 1977) and it follows that the amount absorbed will be directly affected by the amount of magnesium dissolved in the rumen liquor.…”

Section: Resultsmentioning

confidence: 99%

The bioavailability of magnesium from different types of calcined magnesites of Greek origin

Zervas

Papadopoulos

1993

Anim. Sci.

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The objective of this work was to determine the apparent bioavailability of magnesium from four different types of calcined magnesites of Greek origin. These four types (A, B, C, D) were different in particle size fractions and production process. The solubility of the above four magnesium samples and their fractions were determined: (a) in the laboratory using ammonium nitrate solution after 24-h shaking and (b) in vivo using a nylon bag technique after 24-h incubation. Solubility was correlated with apparent bioavailability as determined in a balance experiment with five wether sheep in a 5 X5 Latin-square design. Sheep were kept in metabolism cages and were given daily a basal diet (500 g hay + 700 g concentrate) plus 2 g magnesium supplements from types A to D. The magnesium bioavailability of the basal diet was used as a base for the determination of the bioavailability of magnesium in A, B, C and D supplements. Magnesium apparent bioavailability of the basal diet was found to be 0-203 and, for the supplements A, B, C and D, 0-381, 0-339, 0-315 and 0-292 respectively. The solubility of supplements A, B, C and D in ammonium nitrate solution and in vivo (using the nylon-bag technique) was found to be 0-812, 0-805, 0-784 and 0-773 or 0-294, 0-152, 0-102 and 0-200 respectively. The solubilities of the magnesium supplements in ammonium nitrate solution and in vivo both reflected dietary bioavailability differences up to a point, but neither was well enough correlated with the apparent bioavailability as determined by the balance experiment, this being judged to be the most precise method for bioavailability determination.

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Section: Resultsmentioning

confidence: 99%

The bioavailability of magnesium from different types of calcined magnesites of Greek origin

Zervas

Papadopoulos

1993

Anim. Sci.

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“…The bag technique has been used for studying the digestibility of DM in forages and roughages (Van Keuren and Heinemann, 1962;Monson et al, 1969;Neathery, 1969;McManus et al, 1972;Quinton, 1972;Uden et al, 1974;Lindberg, 1981a;) and concentrates (Bailey and Hironaka, 1970;Tigroid et al, 1972;Nordin and Campling, 1976;Orskov and Greenlaugh, 1977;Stern et al, 1978aStern et al, , 1978bLindberg, 1981aLindberg, , 1981b. As noted previously, the technique has gained recent popularity as a means of estimating the extent of ruminai M degradation in protein supplements Crawford et al, 1978;Orskov and McDonald, 1979;Mathers and Miller, 1981;Loerch et al, 1983aLoerch et al, , 1983bZinn.and Owens, 1983) as well as in complete diets (Nocek et al, 1979;and Stern and Satter, 1984).…”

Section: Digestion Lagmentioning

confidence: 99%

“…The length of time during which bags containing samples are exposed to the rumen environment may also have a direct effect on the extent to which various feed components are degraded. In studies with roughages, Neathery (1969) and Playne et al (1978) Due in part to their lower CW content, concentrates are degraded much more rapidily in situ than are forages or roughages. Disappearance of dry matter in concentrates often exceeds 90% within the first 24 to 36 h of incubation (Tigroid et al, 1972;Lindberg, 1981aLindberg, , 1981b.…”

Section: Period Of Incubationmentioning

confidence: 99%

“…Results of studies by , Lindberg (1981b), Loerch et al (1983a), and tend to support this hypothesis. Other investigators (Van Keuren and Heinemann, 1962;Neathery, 1969) have reported that in situ degradation of forages is influenced by the type of forage fed. In comparing legume versus grass hay alone or in combination, Playne et al (1978) concluded that maximal rates of fiber digestion in situ were obtainable only when grass hay comprised a portion of the diet fed to the fistulated animal.…”

Section: Diet Of Fistulated Animalmentioning

confidence: 99%

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Kinetics of alfalfa nitrogen and cell wall disappearance from ruminally-incubated dacron bags

Farquhar

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This reproduction was made from a copy of a manuscript sent to us for publication and microfilming. While the most advanced technology has been used to pho tograph and reproduce this manuscript, the quality of the reproduction is heavily dependent upon the quality of the material submitted. Pages in any manuscript may have indistinct print. In all cases the best available copy has been filmed.The following explanation of techniques is provided to help clarify notations which may appear on this reproduction. Manuscripts may not always be complete. When it is not possible to obtainmissing pages, a note appears to indicate this. When copyrighted materialsare removed from the manuscript, a note ap pears to indicate this. 3. Oversize materials (maps, drawings, and charts) are photographed by sec tioning the original, beginning at the upper left hand comer and continu ing from left to right in equal sections with small overlaps. E)ach oversize page is also filmed as one exposure and is available, for an additional charge, as a standard 35mm slide or in black and white paper format.* 4. Most photographs reproduce acceptably on positive microfilm or micro fiche but lack clarity on xerographic copies made from the microfilm. For an additional charge, all photographs are available in black and white standard 35mm slide format.*

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“…Several studies have been made to ascertain whether loss of feed frorn nylon bags in the rumen of cattle could be used to estimate digestibility (4,5,7,9). However, since the nylon bag technique does not reproduce exactly the processes involved in normal digestion, relationships found between apparent digestibility and loss from bags are not reproducible under all conditions.…”

Section: Iniroductionmentioning

confidence: 99%

Maximum Loss of Feed From Nylon Bags in the Rumens of Steers as Related to Apparent Digestibility

Bailey¹,

Hironaka²

1970

Can. J. Anim. Sci.

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Nylon bags containing rolled barley or mix-and all-barley rations, respectively. The cortures of rolled barley and finely chopped alf-responding values for maximum protein loss alta hay in ratios of 1:1, 2:,1, and 3:1 were were 95.3,94.2,94.6,and98.8% while those removed from two fistulated steers 1, 2, 4, 8, for apparent protein digestibility were 76.8, 14,24, 48, and,72 Another approach would be to find some characteristic that is more reproducible than moasurements of the amount of feed lost after a predetermined time interval. In a previous exporiment the rate of loss of dried grass from nylon bags declined steadily after the first hour, and the total loss appeared to approach a maximum value ( 1). If such a maximum could be measured, it might be a useful index of digestibility. We reasoned that the asymptote of the line of best fit through the cumulative loss curve would be an estimate of tho theoretical maximum loss of any feed from nylon bags. In this paper we present results that describe the cumulative loss of fo'ur different diets from nylon bags and cornpare the calculated maximum loss with apparent digestibilities of the same feeds measured in the usual way. MATERIAIS AND METHODS RationsFour rations were used; three were mixed steam-rolled badey and alfalfa hay in ratios of "1,:"1,,2:1, and 3:1, and the fourth was barley alone. Enough linseed oil meal was added to the barley in all rations to raise the protein content to that of the hay, so that each ration would have the same crude protein content (l4.5Vo). The protein content of the barley was l3.2Vo. Gan. J. Anim. Sci.50:325-330 (Aug. 1970) 325 Can. J. Anim. Sci. Downloaded from www.nrcresearchpress.com by 18.236.120.13 on 05/11/18For personal use only.

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Dry Matter Disappearance of Roughages in Nylon Bags Suspended in the Rumen

Cited by 21 publications

References 8 publications

The bioavailability of magnesium from different types of calcined magnesites of Greek origin

The bioavailability of magnesium from different types of calcined magnesites of Greek origin

Kinetics of alfalfa nitrogen and cell wall disappearance from ruminally-incubated dacron bags

Maximum Loss of Feed From Nylon Bags in the Rumens of Steers as Related to Apparent Digestibility

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