Variation in Determinations of Digestive Capacity of Sheep

Forbes, E. B.; Elliott, R. F.; Swift, R. W.; James, W. H.; Smith, Vivian Frances

doi:10.2527/jas1946.53298x

Cited by 24 publications

(8 citation statements)

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“…The inter-animal variation in the measurement of DM digestibility (Table 1) was higher than that reported by Forbes et al (5), Raymond et al (15) and Homb (6). This could have been caused by the use ofadlihitum feeding compared with restricted feeding in the work of these authors.…”

Section: Discussioncontrasting

confidence: 71%

IN VITRO AND FAECAL NITROGEN TECHNIQUES FOR PREDICTING THE VOLUNTARY INTAKE OF CHLORIS GAYANA

Minson

Milford

1967

Grass and Forage Science

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The voluntary intake by penned sheep, of two Rhodes-grass varieties (Samford and Callide) cut at 4 stages of maturity was studied. Intake of dry matter was correlated with in vitro digestion of DM after 12 h incubation. The intake of digestible DM was correlated (r=O-99) with the sum of the digestion after 12 and 48 h incubation. Coarsely ground samples (2-5 mm screen) were digested in vitro less rapidly than finely ground samples (0 4 mm screen), especially with the more mature forages. DM digestibility, voluntary intake of DM and digestible DM were also correlated (r>0-96) with faecal nitrogen, although different regression equations applied to the two varieties.

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Section: Discussioncontrasting

confidence: 71%

IN VITRO AND FAECAL NITROGEN TECHNIQUES FOR PREDICTING THE VOLUNTARY INTAKE OF CHLORIS GAYANA

Minson

Milford

1967

Grass and Forage Science

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“…For practical purposes, lignin meets this requirement as shown by Ellis et al (1946), Forbes and Garrigus (1948), and Forbes et at. (1946).…”

Section: Review Of Literaturementioning

confidence: 85%

“…However some controversy has arisen over the validity of the assumption that lignin is not digested (Bondi, 1948;Crampton et al, 1938;Csonka et al, 1929;Davis et al, 1947;Forbes et al, 1948). Reports by Ellis et al (1946) and Forbes et al (1946) stated that many of the discrepancies concerning the digestibility of lignin might be attributed to the chemical procedures used to isolate it from the feeds and feces, and failure to analyze material comparable to that actually being consumed by the animal. In the studies by Ellis et al (1946); Forbes et al (1946);and Chi (1951) it was shown that the digestibility of lignin fluctuated slightly above and below zero and the average approached zero.…”

Section: Review Of Literaturementioning

confidence: 99%

Measuring Consumption and Digestibility of Winter Range Plants by Sheep

Cook¹,

Stoddart²,

Harris³

1951

Journal of Range Management

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Allen Press and Society for Range Management are collaborating with JSTOR to digitize, preserve and extend access to Journal of Range Management.

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“…While lignin has often been reported to be indigestible (Crampton & Maynard, 1938;Forbes et al 1946;Kane et al 1950), recent work indicates lignin is apparently digested (Allinson & Osbourn, 1970;Fahey et al 1979). The analytical technique used affects the digestibility estimate, although relative differences between diets are generally similar (Muntifering et al 1981).…”

Section: Digestibility Of Lignin and Phenolic Monomersmentioning

confidence: 99%

Effects of ruminant digestion and metabolism on phenolic monomers of forages

1983

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1. Immature and mature lucerne (Medicago sativa) and tall fescue (Festuca arundinacea) hays were analysed for their lignin and phenolic monomer (hydroxybenzoic and hydroxycinnamic acid derivatives) contents. These hays were given to four sheep with rumen, duodenal and ileal cannulas, and to a steer with rumen and abomasal cannulas, to investigate the extent and sites of digestion of lignin and phenolic monomers.2. The hays and digesta samples were analysed for alkali and nitrobenzene-extractable phenolic monomers. Lanthanum oxide was used as an external marker in the digestion studies. Urine was also collected for estimates of total phenolic balance.3. Grass hays contained greater concentrations of alkali-labile phenolic monomers than did legume hays, whereas legume hays had higher levels of nitrobenzene oxidation products. Mature tall fescue hay had greater concentrations of phenolic monomers than did immature tall fescue hay, but corresponding differences with maturity were not observed with lucerne hays.4. There were quantitative differences between diets in the digestibilities and in the sites of digestion of phenolic monomers. Digestibilities ranged from 0.191 to 1.004 for alkali-labile compounds and from -1.137 to 0.868 for nitrobenzene oxidation products. Composition of lignin was altered during its passage through the digestive tract. The proportion of phenolic monomers not recovered in urine and faeces varied from -1.014 to 0471 for individual compounds and differed between diets. Soluble phenolic monomers decreased in concentration as digesta passed from the rumen to the abomasum and duodenum, but increased again in the ileum; levels varied with diet. Phenolics were rapidly solubilized in the rumen after feeding.5. Results indicate that forages differ in their phenolic monomer content and in the digestibility of these compounds. Therefore, lignin is not an inert compound in the digestive tract of ruminants as has been previously reported.Although lignification is generally considered to be the primary factor limiting the digestion of forage cell-wall carbohydrates by ruminants, relatively little attention has been given to the differences in lignin composition of forages and how those differences might account for variations between plant species in lignin's inhibitory effects. Recent work (Akin, 1982; Jung & Fahey, 1983 b) demonstrated that the phenolic monomer constituents of lignin are inhibitors of cellulose degradation by rumen microbes in vitro and that phenolic compounds differ in their extent of inhibition. Forages are known to differ in their content of these phenolic monomers (Gee et al. 1968;Hartley & Jones, 1977;. Degradation of forage cell walls by rumen micro-organisms results in alterations in the amounts of phenolics recoverable from the plant material, with apparent digestibilities being noted for most monomers (Theander et al. 1981;.Intake of feedstuffs by non-ruminants is depressed by the presence of phenolic monomers (hydroxybenzoic and hydroxycinnamic acid derivatives) in the diet...

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Variation in Determinations of Digestive Capacity of Sheep

Cited by 24 publications

References 0 publications

IN VITRO AND FAECAL NITROGEN TECHNIQUES FOR PREDICTING THE VOLUNTARY INTAKE OF CHLORIS GAYANA

IN VITRO AND FAECAL NITROGEN TECHNIQUES FOR PREDICTING THE VOLUNTARY INTAKE OF CHLORIS GAYANA

Measuring Consumption and Digestibility of Winter Range Plants by Sheep

Effects of ruminant digestion and metabolism on phenolic monomers of forages

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