Hostname: page-component-77c89778f8-m42fx Total loading time: 0 Render date: 2024-07-18T15:09:10.756Z Has data issue: false hasContentIssue false
  • English
  • Français

The indirect estimation of the digestibility of pasture herbage III. Regressions of digestibility on faecal nitrogen concentration: effects of species and individuality of animal and of the method of determining digestibility upon the relationships

Published online by Cambridge University Press:  27 March 2009

J. P. Langlands ,
J. L. Corbett  and
I. McDonald
J. P. Langlands
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
J. L. Corbett
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
I. McDonald
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
Get access Rights & Permissions [Opens in a new window]

Extract

1. A 36-day continuous digestibility trial with three steers and three sheep fed fresh pasture herbage was carried out during May and June, 1960. For all animals the digestibilities of herbage organic matter (O.m.) were estimated both by collection of faeces and by administering standard quantities of chromium sesquioxide (Cr203) twice daily and determining concentrations of Cr203 in faeces. In a further 36-day trial during August and September 1960, three steers and three cows were used; with the steers, digestibilities were estimated by both methods but with the cows by the Cr203 method only.

2. Regression equations were obtained relating O.m. digestibility to the percentage of nitrogen (N) in faecal O.m. When digestibilities were estimated by the same method the same regression coefficients could be fitted to the data from each of the steers and sheep in the spring trial. A similar result was found with the data from each of the steers and cows in the summer trial.

3. In each equation different constant terms were required for each animal, which differed significantly between individuals but not between species or class of animal. Data obtained from an examination of the relationship of g. N excreted per 100 g. feed dry matter to g. N intake per 100 g. feed dry matter indicated that differences between the constant terms could be linked with variations between animals in the excretion of metabolic faecal N.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 61 , Issue 2 , October 1963 , pp. 221 - 226
Copyright
Copyright © Cambridge University Press 1963

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Ashton, G. C. (1962). J. Agric. Sci. 58, 333.CrossRefGoogle Scholar
Axelsson, J. & Kivimae, A. (1951). Acta agric. Scand. 1, 282.CrossRefGoogle Scholar
Blaxter, K. L. & Mitchell, H. H. (1948). J. Anim. Sci. 7, 351.CrossRefGoogle Scholar
Blaxter, K. L., Graham, N. McC. & Wainman, F. W. (1956). Brit. J. Nutr. 10, 69.CrossRefGoogle Scholar
Blaxter, K. L. & Wainman, F. W. (1961). J. Agric. Sci. 57, 419.CrossRefGoogle Scholar
Christian, K. R. & Coup, M. R. (1954). N.Z. J. Sci. Tech. A, 36, 328.Google Scholar
Commonwealth Bureau of Pastures and Field Crops (1961). Bull. Bur. Past. Hurley, no. 45.Google Scholar
Corbett, J. L. (1960). Proc. Int. Grassl. Congr. VIII, Reading, p. 438.Google Scholar
Corbett, J. L., Greenhalgh, J. F. D., McDonald, I. & Florence, E. (1960). Brit. J. Nutr. 14, 289.CrossRefGoogle Scholar
Edin, H. (1926). Medd. Cent Anst. Försöksv. Jordbr. Stockh. no. 309.Google Scholar
Elam, C. J., Reynolds, P. J., Davis, R. E. & Everson, D. O. (1962). J. Anim. Sci. 21, 189.CrossRefGoogle Scholar
Greenhalgh, J. F. D., Corbett, J. L. & McDonald, I. (1960). J. Agric. Sci. 55, 377.CrossRefGoogle Scholar
Hutchinson, K. J. (1958). Aust. J. Agric. Res. 9, 508.CrossRefGoogle Scholar
Kehar, N. D. & Mukherjee, R. (1949). Indian J. Vet. Sci. Anim. Husb. 19, 113.Google Scholar
Minson, D. J. & Raymond, W. F. (1958). Exp. Progr. Grassl. Res. Inst., Hurley, 10, 92.Google Scholar
Spedding, C. R. W. (1954). J. Comp. Path. 64, 5.CrossRefGoogle Scholar
Stevenson, A. E. (1962). N.Z. J. Agric. Res. 5, 338.CrossRefGoogle Scholar