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The use of the rumen degradation characteristics of hay as predictors of its voluntary intake by sheep

Published online by Cambridge University Press:  02 September 2010

M. D. Carro ,
S. Lopez ,
J. S. Gonzalez  and
F. J. Ovejero
M. D. Carro
Affiliation:
Departamento de Producción Animal, Universidad de León, 24004, Spain
S. Lopez
Affiliation:
Departamento de Producción Animal, Universidad de León, 24004, Spain
J. S. Gonzalez
Affiliation:
Departamento de Producción Animal, Universidad de León, 24004, Spain
F. J. Ovejero
Affiliation:
Departamento de Producción Animal, Universidad de León, 24004, Spain
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Abstract

Eleven sun-cured hays with crude protein (CP) and neutral-detergent fibre (NDF) concentrations ranging from 57 to 207 and 428 to 744 g/kg dry matter (DM) respectively, were used to study the relationship between the DM and NDF degradation characteristics and the voluntary DM intake (VDMI) by sheep.

The VDMI was measured in the last 10 days of a 21-day period using 50 mature ewes in five groups of 10 ewes per group, with a mean live weight (LAY) of 55 kg and ranged from 41·2 to 69·8 g/day per kg LW075. Disappearanc e rates of DM and NDF were measured by incubating samples in nylon bags in the rumens of three hay-fed rumen-cannulated ewes for 3, 6, 9, 15, 24, 48 and 72 h and by fitting the exponential model Y = a + b (1 — e-ct) to the results. Potential degradabilities (defined as a + b) for DM and NDF ranged from 679 to 868 and from 445 to 808 g/kg respectively.

The VDMI was significantly correlated with the soluble fraction of DM (aDM; P < 0·05) and the rate of degradation of DM (cDM; P < 0·01) and NDF (cNDF; P < 0·01). The inclusion of aDM and cDM ni a multiple regression model resulted in the equation: VDMI = 21·3 + 0·0733 (s.e. 0·01577) aDM + 138 (s.e. 26·0) cDM (R2 = 0·897; residual s.d. = 2·79), with a significant increase of the variance explained by one single degradation characteristic (P < 0·05). The prediction was not improved by adding the constant cNDF to the equation (P > 0·05). These results indicate the possibility of predicting the VDMI of hays by sheep from the rumen soluble fraction (aDM) and the rate of degradation (cDM) of DM.

Keywords

degradationhayintakesheep
Type
Research Article
Information
Animal Production , Volume 52 , Issue 1 , February 1991 , pp. 133 - 139
Copyright
Copyright © British Society of Animal Science 1991

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References

REFERENCES

Aitchison, E. M., Gill, M., Dhanoa, M. S. and Osbourn, D. F. 1986. The effect of digestibility and forage species on the removal of digesta from the rumen and the voluntary intake of hay by sheep. British Journal of Nutrition 56: 463–476.Google Scholar
Association of Official Analytical Chemists. 1975. Official Methods of Analysis of the Association of Official Analytical Chemists. 10th ed. Washington, DC.Google Scholar
Chenost, M., Grenet, E., Demarquilly, C. and Jarrige, R. 1970. The use of the nylon bag technique for the study of forage digestion in the rumen and for predicting feed value. Proceedings of the 11th International Grassland Congress, Surfers Paradise, pp. 697–701. University of Queensland Press, St. Lucia, Australia.Google Scholar
Demarquilly, C. and Chenost, M. 1969. Etude de la digestion des fourrages dans le rumen par la methode des sachets de nylon: liasons avec la valeur alimentaire. Annales de Zootechnie 4: 419–436.Google Scholar
Dulphy, J. P. and Demarquilly, C. 1983. Voluntary feed consumption as an attributte of feeds. In Feed Information and Animal Production (ed. Robards, G. E. and Packhampp, R. G.), pp. 135–156. Commonwealth Agricultural Bureaux, Slough.Google Scholar
Ellis, W. C., Wylie, M. J. and Matis, J. H. 1988. Dietary-digestive interactions determining the feeding value of forages and roughages. In Feed Science (ed. Ørskov, E. R.), pp. 177–225. Elsevier, Amsterdam.Google Scholar
Fahey, G. C. and Merchen, N. R. 1987. Analytical procedures associated with estimation of feed intake: the detergent system of analysis. In Feed Intake by Beef Cattle (ed. Owens, F. N.), pp. 41–61. University of Oklahoma.Google Scholar
Goering, H. K. and Van Soest, P. J. 1970. Forage fiber analysis (apparatus, reagents, procedures and some applications). Agricultural Handbook, US Department of Agriculture, No 379.Google Scholar
Hovell, F. D. Deb., Ngambi, J. W. W., Barber, W. P. and Kyle, D. J. 1986. The voluntary intake of hay by sheep in relation to its degradability in the rumen as measured in nylon bags. Animal Production 42: 111–118.Google Scholar
Lopez, S., Carro, M. D., Gonzalez, J. S. and Ovejero, F. J. 1989. The possibility of predicting the sheep voluntary dry-matter intake of hays from their rumen degradation characteristics. Animal Production 48: 638 (Abstr.).Google Scholar
Mertens, D. R. 1973. Application of theoretical mathematical models to cell wall digestion and forage intake in ruminants. Ph.D. Thesis, Cornell University.Google Scholar
Mertens, D. R. 1977. Dietary fiber components: relationship to the rate and extent of ruminal digestion. Federation Proceedings 36: 187–192.Google Scholar
Miller, W. J. and Oddoye, E. O. K. 1989. Prediction of voluntary intake of conserved forages by cattle and sheep from degradability characteristics determined using synthetic fibre bags in sheep. Animal Production 48: 637–638 (Abstr.).Google Scholar
Nocek, J. E. 1985. Evaluation of specific variables affecting in situ estimates of ruminal dry matter and protein digestion. Journal of Animal Science 60: 1347–1358.CrossRefGoogle Scholar
Ørskov, E. R., Hovell, F. D. Deb. and Mould, F. 1980. The use of the nylon bag technique for the evaluation of feedstuffs. Tropical Animal Production 5: 195–213.Google Scholar
Ørskov, E. R. and Mcdonald, I. 1979. The estimation of protein degradability in the rumen from incubation measurements weighted according to rate of passage. Journal of Agricultural Science, Cambridge 92: 499–503.Google Scholar
Ørskov, E. R., Reid, G. W. and Kay, M. 1988. Prediction of intake by cattle from degradation characteristics of roughages. Animal Production 46: 29–34.Google Scholar
Preston, R. L. 1987. Conference summary and overview. In Feed Intake by Beef Cattle (ed. Owens, F. N.), pp. 387–391. University of Oklahoma.Google Scholar
Smith, L. W., Goering, H. K. and Gordon, C. H. 1972. Relationships of forage compositions with rates of cell wall digestion and indigestibility of cell walls. Journal of Dairy Science 55: 1140–1147.CrossRefGoogle Scholar
Van Soest, P. J. 1975. Physico-chemical aspects of fibre digestion. In Digestion and Metabolism in the Ruminant (ed. McDonald, I. W. and Warner, A. C. I.), pp. 351–365. Commonwealth Scientific and Industrial Research Organisation, Sydney.Google Scholar