Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-15T01:32:50.321Z Has data issue: false hasContentIssue false
  • English
  • Français

The apparent digestibility of crude protein by the ruminant: I. A synthesis of the results of digestibility trials with herbage and mixed feeds

Published online by Cambridge University Press:  27 March 2009

J. Glover ,
D. W. Duthie  and
M. H. French
J. Glover
Affiliation:
East African Agriculture and Forestry Research Organization, Muguga, Kenya
D. W. Duthie
Affiliation:
East African Agriculture and Forestry Research Organization, Muguga, Kenya
M. H. French
Affiliation:
East African Agriculture and Forestry Research Organization, Muguga, Kenya
Get access Rights & Permissions [Opens in a new window]

Extract

The apparent digestibility of crude protein by cattle and sheep of different breeds and types, both temperate and tropical, has been studied by means of an analysis of the results of feeding trials with herbages and mixed feeds in many parts of the world. No matter whether herbages or mixed feeds are used the digestibility coefficient (y) is shown to be related to the percentage crude-protein content of the feed (x) by means of an expression of the form y = a + b log x. The particular equation y= 70 log x − 5 is shown to give a reasonable fit of all the available data.

The digestibility of crude protein in the feed is shown to increase very rapidly at low protein levels (from about 2 to 9%), and there after it rises more slowly as the crude-protein content increases.

There is close agreement between the equations for herbage fed alone and for mixed feed which suggests that the total percentage of crude protein in the feed, irrespective of its nature, determines the digestibility of the protein.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 48 , Issue 3 , February 1957 , pp. 373 - 378
Copyright
Copyright © Cambridge University Press 1957

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

Mitchell, H. H. (1942). J. Anim. Sci. 1, 159.CrossRefGoogle Scholar
Warth, F. J. (1930). Mem. Dep. Agric. India, Chem., 11, 73.Google Scholar

References to Digestibility data

Allison, R. M. & Thurston, W. G. (1952). N.Z. J. Sci. Tech. 34A, 341.Google Scholar
Axtmayer, J. H. et al. (1950). J. Agric. Univ. P. R. 22, 455; 24, 1.Google Scholar
Botha, J. P. (1938). Fmg in S. Afr. 13, 63, 605.Google Scholar
Coop, I. E. et al. (1952). N.Z. J. Sci. Tech. 34A, 507.Google Scholar
Dunlop, A. A. & Coup, M. R. (1951). N.Z. J. Sci. Tech. 32A, (5) 21; 33A, (4) 1.Google Scholar
French, M. H. (1931–1956). Sep. Dep. Vet. Sci. Tanganyika, 1931, p. 44; 1932, p. 29; 1933, p. 49; 1934, p. 79; 1935, p. 98; 1937, p. 81; 1938, pt. II, pp. 28, 37, 51. E. Afr. Agric. J. 4, 206; 8, 126, 241; 9, 38, 144, 221; 11, 100, 159. J. Agric. Sci. 30, 503. Emp. J. Exp. Agric. 9, 23; 24 (in the Press).Google Scholar
Harvey, J. M. (1952). Qd J. Agric. Sci. 9, 169.Google Scholar
Kellner, O. (1926). The Scientific Feeding of Animals. London: Duckworth.Google Scholar
Lancaster, K. J. & Adams, A. F. R. (1944). N.Z. J. Sci. Tech. 25A, 131, 137.Google Scholar
Lander, P. E. et al. (1924–1942). Mem. Dep. Agric. India, Chem., 7, 77; 9, 63, 235; 10, 169, 181, 193. Indian J. Vet. Sci. 1, 177; 2, 141; 6, 117. Misc. Bull. Imp. Coun. Agric. Res. India no. 16.Google Scholar
Lander, P. E. (1949). The Feeding of Farm Animals in India, p. 492. Calcutta: Macmillan.Google Scholar
Louw, J. G. et al. (1948). Onderstepoort J. Vet. Sci. 23, 239.Google Scholar
Morrison, F. B. (1947). Feeds and Feeding, 20th ed.New York: Morrison Publ. Co.Google Scholar
Myburgh, S. J.(1937). Onderstepoort J. Vet. Sci. 9, 165.Google Scholar
Rogerson, A. (1955–1956). E. Afr. Agric. J. 20, 189, 240; 21 (in the Press), and unpublished data.Google Scholar
Ross, J. C. et al. (1931). Bull. Univ. Pretoria, no. 20.Google Scholar
Sen, K. C. (1938). Misc. Bull. Imp. Coun. Agric. Res. India, no. 25.Google Scholar
Sen, K. C. (1953). Animal Nutrition Research in India. Calcutta: Macmillan.Google Scholar
Talapatra, S. K. et al. (1950). Indian J. Vet. Sci. 20, 183, 229, 241.Google Scholar
Todd, J. R. (1956). J. Agric. Sci. (in the Press).Google Scholar
Truter, G. J. & Louw, J. G. (1950). Onderstepoort J. Vet. Sci. 24, 57.Google Scholar
Warth, F. J. et al. (1926–1930). Mem. Dep. Agric. India, Chem., 9, 37; 10, 1; 11, 53, 73, 85.Google Scholar
Watson, S. J. & Horton, E. A. (1936). J. Agric.Sci. 26, 142.CrossRefGoogle Scholar
Woodman, H. E. (1954). Rations for Livestock, Bull. Minist. Agric. Lond., no. 48.Google Scholar
Woodman, H. E. et al. (1916–1944). J. Agric. Sci. 8, 429; 11, 304; 12, 144; 13, 483; 16, 205; 18, 266, 544; 19, 236; 20, 53; 21, 267; 22, 852; 23, 419; 24, 283, 575; 25, 50; 29, 347; 30, 189; 33, 1; 34, 35, 110.Google Scholar