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The effects of diet supplements and gamma irradiation on dissimilation of low-quality roughages by ruminants: II. Effects of gamma irradiation and urea supplementation on dissimilation in the rumen

Published online by Cambridge University Press:  27 March 2009

W. R. McManus ,
L. Manta ,
J. D. McFarlane  and
A. C. Gray
W. R. McManus
Affiliation:
School of Wool and Pastoral Sciences, The University of New South Wales, Kensington, N.S.W. 2033, Australia
L. Manta
Affiliation:
School of Wool and Pastoral Sciences, The University of New South Wales, Kensington, N.S.W. 2033, Australia
J. D. McFarlane
Affiliation:
School of Wool and Pastoral Sciences, The University of New South Wales, Kensington, N.S.W. 2033, Australia
A. C. Gray
Affiliation:
C.S.I.R.O. Computing Research Section, Sydney, Australia
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Summary

Results of two in vivo sheep experiments in which gamma-irradiated material in teryleno bags was fermented in the rumen are reported.

Exp. I concerned the testing of rice straw, nassella (Nassella trichotoma) and cotton lint, each subjected to six dose levels of gamma irradiation (0, 5, 10, 25, 100 and 200 Mrad) when wet and when in the dry state. The tests were made in sheep fed either a lucerne hay or a rice-straw base diet.

Dry -matter disappearance of all test materials was influenced by irradiation treatment: levels of 10 and in some instances 25 Mrad depressed, and other levels substantially enhanced, intraruminal degradation rate tested over 72 h. Materials irradiated in the dry state were better dissimilated than those irradiated in the wet state.

On severe shaking for 14 h in water, solubility values as high as 35 % were obtained for irradiated test materials receiving the highest dose of irradiation but such values were never of the same magnitude as total dry-matter losses in the rumen. When irradiated material was immersed in gently flowing water for 12 h solubility values of 1 % were found for material dosed at 100 or 200 Mrad and of nil for other dose levels. At no level of irradiation was solubility depressed. It was concluded that enhanced losses of irradiated dry matter in the ruminal environment arose substantially from fermentation.

Intraruminal dissimilation of irradiated test material from terylene bags was always greater on lucerne hay base diets than on rice straw base diets.

Exp. II investigated the influence of urea supplementation, at levels of 1 % and 2 % of diet, on the dissimilation of irradiated test samples of cotton lint and rice straw for sheep fed a rice-straw base diet.

Similar effects of irradiation on cotton lint and rice straw to those found in Exp. I were observed. Overall, urea supplementation depressed dissimilation rate of rice straw and severely depressed degradation of cotton lint irrespective of irradiation dose up to an irradiation dose level of 100 Mrad. It is concluded that urea supplementation per se depressed the activity of cellulolytic organisms.

It is considered that feeding trials with low-quality roughages irradiated at levels at or greater than 25 Mrad are warranted.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 79 , Issue 1 , August 1972 , pp. 41 - 53
Copyright
Copyright © Cambridge University Press 1972

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References

Ammerman, C. B., Evans, J. L., Tomlin, D. G., Arrtngton, L. R. & Davis, G. K. (1959). Gamma irradiation and subsequent digestion in the rumen of cellulose and various roughages. J. Anim. Sci. 18, 1518(Abstr.).Google Scholar
Beckmann, E. (1922). Conversion of grain straw and lupines into feeds of high nutritional value. Cham. Abstr. 16, 765.Google Scholar
Chappell, G. L. M. & Fontenot, J. P. (1968). Effect of level of readily available carbohydrates in purified sheep rations on cellulose digestibility and nitrogen utilization. J. Anim. Sci. 27, (6), 1709–15.CrossRefGoogle Scholar
Charlesby, A. (1955). Degradation of cellulose by ionizing radiation. J. Polymer. Sci. 15, 263–70.CrossRefGoogle Scholar
Dilli, S., Ernst, I. T. & Garnett, J. L. (1967). Badiation-induced reactions with cellulose. IV. Electron paramagnetic resonance studios of radical formation. Aust. J. Chem. 20 (5), 911–27.CrossRefGoogle Scholar
Faichney, G. J. (1965). The effect of sucrose on the utilization of straw plus urea diets by sheep. Aust. J. agric. Res. 16 (2), 159–67.CrossRefGoogle Scholar
Garnbtt, J. L. & Mebewether, J. W. T. (1960). Chemical effects from the irradiation of wood. Proc. Conf. Technological Use of Radiation, pp. 76–81. Australian Atomic Energy Commission. Melbourne University Press.Google Scholar
Godden, W. (1942). Predigestion of straw. Scott. Agric. 23, 373–7.Google Scholar
Gilfillan, E. S. & Linden, L. (1955). Effect of nuclear radiation on the strength of yarns. Text. Res. J. 25, 773–7.CrossRefGoogle Scholar
Lawton, E. J., Bellamy, W. D., Hingate, R. E., Bryant, M. P., & Hall, E. (1951). Some effects of high-velocity electrons on wood. Science, N.Y. 113, 380–2.CrossRefGoogle ScholarPubMed
MoAnally, R. A. (1942). Digestion of straw by the ruminant. Biochem. J. 36, 392–9.CrossRefGoogle Scholar
McManus, W. R., Manta, L., McFarlane, J. D. & Gray, A. C. (1972). The effects of diet supplements and gamma irradiation on dissimilation of low quality roughages by ruminants. I. Studies on the terylene-bag technique and effects of supplementation of base ration. J. agric. Sci., Camb., 79, 27–40.CrossRefGoogle Scholar
Millett, M. A., Baker, A. J., Feist, W. C., Mellenberger, R. W. & Satter, L. D. (1970). Modifying wood to increase its in vitro digestibility. J. Anim. Sci. 31 (4), 781–8.CrossRefGoogle Scholar
Phuxipson, A. T. & Cuthbertson, D. P. (1956). Modern concepts of rumen digestion and metabolism. 1th Int. Gongr. Anim. Husb., Theme 6, p. 7–92. Madrid.Google Scholar
Pigden, W. J., Pritchard, G. I., & Heaney, D. P. (1966). Physical and chemical methods for increasing the available energy content of forages. Proc. Xth Int. Orassl. Gongr. (Helsinki), pp. 397–401.Google Scholar
Pritchard, G. I., Pigden, W. J. & Minson, D. J. (1962). Effect of gamma-radiation on the utilization of wheat straw by rumen micro-organisms. Can. J. Anim. Sci. 42, 215–17.CrossRefGoogle Scholar
Saeman, J. F., Millett, M. A. & Lawton, E. J. (1952). Effect of high-energy cathode rays on cellulose. Ind. Eng. Chem. 44, 2848–52.CrossRefGoogle Scholar
Stone, E. J., Homan, E. S., Morris, H. F. & Frye, J. B. (1965). Chemical pretreatment of roughages. J. Anim. Sci. 24, 910 (Abstr.)Google Scholar
Teszler, O. & Rutherford, H. A. (1956). The effect of nuclear radiation on fibrous materials. I. Daoron polyester fibre. Text. Res. J. 26, 796–801.CrossRefGoogle Scholar
Teszler, O., Kiser, L. H., Campbell, H. A. & Rutherford, H. A. (1958). Effect of nuclear radiation on fibrous material. III. Relative order of stability of cellulosic fibres. Text. Res. J. 28, 456–62.CrossRefGoogle Scholar
Walker, D. J. (1965). Energy metabolism and rumen micro-organisms. In Physiology of Digestion in the Ruminant(ed. Dougherty, R. W.), pp. 296–310. Washington: Butterworths.Google Scholar
Wilson, R. K. & Pigden, W. J. (1964). Effect of a sodium hydroxide treatment on the utilization of wheat straw and poplar wood by rumen microorganisms. Can. J. Anim. Sci. 44, (1), 122–3.CrossRefGoogle Scholar