The total digestible nutrients and gross digestible energy of ruminant feeds

Glover, Jen; Duthie, D. W.; Dougall, H. W.

doi:10.1017/s0021859600023303

Cited by 29 publications

(6 citation statements)

References 8 publications

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“…Forage quality during the dry season falls below maintenance requirements of the animals with a resulting depletion of body reserves; these reserves are replenished during the wet season (Sinclair and Duncan 1972;Sinclair 1974aSinclair , 1974b. It is well known that forage quality diminishes with plant tissue age (Glover et al 1960;Armstrong et al 1964;Miller et al 1965;Braun 1973) and that higher quality forage not only gives a higher nutritional yield, but can be consumed in larger quantities by ruminants (Hungate 1975). Thus, apparent overcropping by wildebeest probably maintains higher nutritional yield than would less intense grazing, allowing more rapid replenishment of body reserves than would consumption of larger quantities of lower quality forage (Baile and Forbes 1974;Hungate 1975).…”

Section: Resultsmentioning

confidence: 99%

Grazing as an Optimization Process: Grass-Ungulate Relationships in the Serengeti

McNaughton¹

1979

The American Naturalist

1,070

765

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ecologists have tended to view plants as relatively passive participants in short-term interactions at the plant-herbivore interface, suffering tissue reduction from herbivory, and responding in evolutionary time through the evolution of novel antiherbivore chemicals and structures (Fraenkel 1959;Ehrlich and Raven 1964;Levin 1971Levin , 1973Caswell et al. 1973;Freeland and Janzen 1974). Agronomists, botanists, foresters, and range managers, however, have frequently emphasized the direct plant responses to herbivory of compensatory growth and assimilate reallocation (

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Section: Resultsmentioning

confidence: 99%

Grazing as an Optimization Process: Grass-Ungulate Relationships in the Serengeti

McNaughton¹

1979

The American Naturalist

1,070

765

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“…In the present series of experiments, no prediction of the content of DE of the various forages could be made from chemical composition. Glover, Duthie & Dougall (1960) have given an equation Saccharinum officinarum (Sugar cane tops) * Trial no. refers to the trial number used in a previous publication (Butterworth, 1963 relating DE with CF and CP (depending on TDN), and Walker & Hepburn (1955) have shown that DE is closely related to CF.…”

Section: Discussionmentioning

confidence: 99%

The digestible energy content of some tropical forages

Butterworth

1964

J. Agric. Sci.

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1. The content of gross and digestible energy of twenty-four forages grown in Trinidad was determined using samples of food and faeces from previously described digestibility trials.2. The content of gross energy of the forages ranged from 4-13 to 5-02 kcal./g. and that of digestible energy, from 2-23 to 3-20 kcal./g. The corresponding regression equations could be used for the prediction of digestible energy.4. The calorific equivalent of TDN was calculated in each case and the mean value was found to be 2114 kcal./lb. Highly significant differences in this parameter existed among diets.

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“…is proportional to the % c.p. in the herbage; while Glover, Duthie & Dougall (1960) show that the total feed digestibility falls rapidly as the c.p. content drops below 5 %.…”

Section: Discussionmentioning

confidence: 97%

The utilization of Hyparrhenia veld for the nutrition of cattle in the dry season III. Studies on the digestibility of the produce of mature veld and veld hay, and the effect of feeding supplementary protein and urea

Smith¹

1962

J. Agric. Sci.

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Indigenous (Bos indicus) oxen fed ad lib. were used to measure the changes in the apparent digestibility of mature Hyparrhenia veld during the dry season, and also the apparent digestibility of late-cut veld hay and nitrogen-fertilized veld hay. The forages were those used in a field trial, and the present results complement previous work.1. Mature Hyparrhenia veld harvested at the end of the rains as veld hay or green forage, contains approximately 50% digestible o.m. and 0·6% digestible c.p. The low level of approx. 3% c.p. resulted in a low apparent c.p. digestibility and consequent protein deficiency.2. The nutritive value of the mature Hyparrhenia grassland as ‘standing hay’ progressively dropped to 38% digestible o.m. and negative c.p. digestibility by mid-dry-season in July.3. There was an accompanying decline in voluntary intake of forage from approximately 12 lb. d.m./1000 lb. animal/day at the end of the rains to 8 lb. d.m./1000 lb. animal/day in mid dry season.4. The seasonal drop in digestibility values is accentuated by the drop in dry-matter intake so that a diet of mature veld herbage in mid dry season is grossly deficient in both energy and protein.5. The feeding of supplementary protein or urea resulted in a 40–60% increase in the intake of mature Hyparrhenia forage. Urea and groundnut meal were of equal value in their effect on herbage intake at the level of feeding used in this trial.6. The main factor limiting the utilization of the mature Hyparrhenia veld appears to be a dietary protein deficiency. Increasing the dietary protein level, either by using nitrogen fertilizers to raise the herbage crude protein, per cent, or by supplementary feeding of protein or urea, not only relieved the dietary protein deficiency, but, due to the resultant increase in forage intake, also corrected the deficiency in dietary energy. The nutritive value of mature Hyparrhenia forage was thus raised from a submaintenance to a supra-maintenance level.

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The total digestible nutrients and gross digestible energy of ruminant feeds

Cited by 29 publications

References 8 publications

Grazing as an Optimization Process: Grass-Ungulate Relationships in the Serengeti

Grazing as an Optimization Process: Grass-Ungulate Relationships in the Serengeti

The digestible energy content of some tropical forages

The utilization of Hyparrhenia veld for the nutrition of cattle in the dry season III. Studies on the digestibility of the produce of mature veld and veld hay, and the effect of feeding supplementary protein and urea

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