Selection for Digestibility in Herbage Grasses

Cooper, J. I.; Tilley, J. M. A.; Raymond, W. F.; Terry, R. A.

doi:10.1038/1951276a0

Cited by 52 publications

(19 citation statements)

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“…It seemed at first that Loliurn was inherently more digestible than Dactylis, but recent work at Cambridge (Dent, 1963) has shown that other cocksfoot varieties (notably Scotia and Roskilde 11) are almost as digestible as ryegrass. Current work at Aberystwyth is aimed at breeding for high digestibility in cocksfoot, using the in vitro method to select high-digestibility genotypes within a population of cocksfoot plants (Cooper, Tilley, Raymond & Terry, 1962).…”

Section: Vol 23mentioning

confidence: 99%

The efficient use of grass

Raymond

1964

Proc. Nutr. Soc.

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Section: Vol 23mentioning

confidence: 99%

The efficient use of grass

Raymond

1964

Proc. Nutr. Soc.

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“…1966;Troelsen and Campbell 1969), and there was a view that if it was possible to show that increased voluntary feed intake always was related to increased digestibility, then breeding for improved digestibility of pasture plants should improve voluntary feed intake (Cooper et al 1962). There have been notable successes in selection for increased digestibility (reviewed for example, by Minson (1990) and Buxton and Casler (1993», and they are likely to be reflected in improvements in nutritive value.…”

Section: Feeding Valuementioning

confidence: 96%

Evaluation of the feeding value of pasture legumes

Baker

Dynes

1999

Genetic Resources of Mediterranean Pasture and Forage Legumes

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The distinction between nutritive value and feeding value of forages for animal production is an important one. since variation in voluntary feed intake accounts for a large proportion of the variation that is observed in the feeding value of forages. while nutritive value is largely independent of voluntary feed intake. Some of the limitations in using estimates of dry matter digestibility as indices of nutritive value. and some alternative approaches to evaluation of the feeding value of forages including pasture legumes are discussed. For example. an index can be calculated from production responses of grazing sheep which reflects differences among cultivars of subterranean clover. Trifolium subterraneum. in their feeding values. expressed in terms of efficiency of production of wool. Weston (1982Weston ( 1985Weston ( 1996 quantified the extent to which the amount of forage that an animal consumes falls short of the amount that the animal needs to consume to meet its capacity to use energy as the constraint to forage intake (FCC). Feeding value offorages and some biomechanical and chemical constraints to voluntary feed intake. including the presence of plant secondary compounds. are considered in this context.

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“…been widely used to evaluate varieties of grasses, legumes and brassicae (Dent, 1963) and in the selection of improved grass varieties (Cooper, Tilley, Raymond & Terry, 1962;Burton, Hart & Lowney, 1967). Finally, the method has often been used to estimate the digestibility of feed samples in vivo where levels of feeding or the physical processing of the forage have caused increased rates of passage and depressions in the digestion in vivo.…”

Section: Symposium Proceedings I977mentioning

confidence: 99%

In vitro techniques for the evaluation of ruminant feeds

Osbourn

Terry

1977

Proc. Nutr. Soc.

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For the purposes of this symposium in vitro techniques for the evaluation of ruminant feeds are defined as laboratory methods in which the availability of nutrients in the feed to the digestive process in the ruminant animal is estimated by the incubation of the feed with micrwrganisms or semi-purified enzyme preparations, or both. Ewart (1974) reviewed for the Society recent developments in continuous in vitro rumen systems which are characterized by the continuous or intermittent removal of the products of fermentation and the feed residues. In batch in vitro systems, in contrast, there is no attempt to remove the feed residues and non-gaseous products of fermentation. In this review only batch in vitro methods will be examined as laboratory procedures for the estimation of the digestible (DE) or metabolizable (ME) energy contents of feeds and the metabolizable protein made available by diets. Some prelimina y considerationsCalibration of laboratory methods. In common with chemical procedures in vitro techniques are generally calibrated against estimates of digestibility made in vivo. The digestion of energy (Armstrong, 1964) and the degradability of dietary protein in the rumen (Miller, 1973) are both reduced by increasing the level of feeding and furthermore the effect of level of feeding appears to interact with the intrinsic degradability of each fraction. In order to comply with the ME

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Selection for Digestibility in Herbage Grasses

Cited by 52 publications

References 0 publications

The efficient use of grass

The efficient use of grass

Evaluation of the feeding value of pasture legumes

In vitro techniques for the evaluation of ruminant feeds

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