1963
DOI: 10.1111/j.1365-2494.1963.tb00323.x
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The Use of Rumen‐fistulated Steers in the Direct Determination of Nutritive Value of Ingested Herbage in Grazing Experiments

Abstract: A rumen‐fistulated steer was used for the manual collection of samples of freshly swallowed herbage, in a grazing‐management experiment on a perennial ryegrass sward. Diurnal and seasonal changes in the in vitro digestibility of the herbage selected by the grazing animal were studied under both strip‐ and continuous‐grazing methods of management. There was no appreciable change in digestibility as the sward was grazed down from upper to lower layers under strip‐grazing management in April and May. In June to O… Show more

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Cited by 30 publications
(18 citation statements)
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“…The same argument may be applied to the differences in the composition of the diet selected by fasted and unfasted sheep (see Table 3 and Amold et al (3)). There were no consistent diumal changes in the botanical composition of extrusa samples collected from a single steer by Tayler and Deriaz (17), but in that experiment there was no evidence of consistent diurnal changes in the digestibility of the samples. Cattle would normally be expected to be less selective grazers than sheep (14).…”
Section: Diurnal Variations In the Composition Of Extrusamentioning
confidence: 86%
“…The same argument may be applied to the differences in the composition of the diet selected by fasted and unfasted sheep (see Table 3 and Amold et al (3)). There were no consistent diumal changes in the botanical composition of extrusa samples collected from a single steer by Tayler and Deriaz (17), but in that experiment there was no evidence of consistent diurnal changes in the digestibility of the samples. Cattle would normally be expected to be less selective grazers than sheep (14).…”
Section: Diurnal Variations In the Composition Of Extrusamentioning
confidence: 86%
“…As soon as leaf death reaches appreciable proportions the farmer incurs a loss, as leaf litter is of lower quality than green herbage (Tayler and Deriaz 1963). In addition, because of the rapid rate of leaf decomposition, only a minor portion of what has died can be utilised (by hard grazing, for instance) at anyone time.'…”
Section: Discussionmentioning
confidence: 99%
“…For example, Hutton (1962) estimated that milking Jersey cows have a daily dry matter requirement of about 20 lb of digestible organic matter. Estimates of the digestibility of dead leaf vary from 40% in Scotland (Eadie; see Edmond 1967), to 46 to 54% in Australia (Wilson and Hindley 1968), to 59% in England (Tayler and Deriaz 1963).…”
Section: Death Rate Per U'!it Areamentioning
confidence: 99%
“…Division, FA.O., Rome terms of in vitro organic-matter digestibility (11,12), or of chemical composition can be determined, (b) The digestibility of the samples obtained from the fistula can be used to find directly the digestibility of the herbage eaten, and this finding then applied in the determination of intake by cattle grazing the same swards (11).…”
Section: Introductionmentioning
confidence: 99%
“…There are two major uses for fistulated animals: (a) The samples of herbage obtained from the fistula can be used for the identification of plant species and for the recognition of the parts of the plant selected by the animal; in addition the composition of these fractions in •Present address: A.N. Division, FA.O., Rome terms of in vitro organic-matter digestibility (11,12), or of chemical composition can be determined, (b) The digestibility of the samples obtained from the fistula can be used to find directly the digestibility of the herbage eaten, and this finding then applied in the determination of intake by cattle grazing the same swards (11).…”
Section: Introductionmentioning
confidence: 99%