Skip to main content Accessibility help
×
Home

Nitrogen metabolism in calves: Effect of giving different amounts of dietary casein with and without formaldehyde treatment

  • A. P. Williams (a1) and R. H. Smith (a1)

Extract

1. Calves were given a basal diet of straw and flaked maize (12 g nitrogen/kg dry matter (DM)) or diets with some flaked maize replaced by untreated (UT) casein or formaldehyde-treated (FT) casein to give 19, 26 or 34 g N/kg DM.

2. At all intakes rumen ammonia concentrations were lower and amounts of total-N, non-ammonia-N and amino acid-N entering the duodenum were higher when FT-rather than UT-casein supplements were given.

3. Direct measurement of casein entering the duodenum indicated that giving FT rather than UT casein led to much greater amounts of dietary casein escaping degradation in the rumen (70–90% compared to 10–20%). Calculated values for fermentable N indicated that with this low degradability diets containing FT-casein would have provided inadequate N for maximum microbial synthesis in the rumen, and this probably accounted for the marked reduction in amounts of non-casein-N entering the duodenum when FT rather than UT casein was given.

4. Amino acid patterns in duodenal digesta samples after giving the basal diet or diets containing UT-casein were similar. Giving diets containing FT-casein led to changes in this pattern which could sometimes, although not always, be accounted for by estimated differences in proportions of dietary and microbial proteins.

5. At the highest level of N intake FT-casein-supplemented diets led to significantly higher concentrations of most essential amino acids and lower concentrations of most non-essential amino acids in plasma than did UT-casein-supplemented diets. Plasma urea concentrations increased with increasing N intake but were not significantly different for UT- and FT-casein-supplemented diets.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Nitrogen metabolism in calves: Effect of giving different amounts of dietary casein with and without formaldehyde treatment
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Nitrogen metabolism in calves: Effect of giving different amounts of dietary casein with and without formaldehyde treatment
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Nitrogen metabolism in calves: Effect of giving different amounts of dietary casein with and without formaldehyde treatment
      Available formats
      ×

Copyright

References

Hide All
Barry, T. N. (1972). N. Z. Jl agric. Res. 15, 107.
Conway, E. J. (1957). Microdiffusion Analysis and Volumetric Error, 4th ed., p. 98. London: Crosby, Lockwood & Son Ltd.
Evans, R. A., Axford, R. F. E. & Offer, N. W. (1975). Proc. Nutr. Soc. 34, 65A.
Faichney, G. J. (1974 a). Aust. J. agric. Res. 25, 583.
Faichney, G. J. (1974 b). Aust. J. agric. Res. 25, 599.
Ferguson, K. A., Hemsley, J. A. & Reis, P. J. (1967). Aust. J. Sci. 30, 215.
Fraser, I. E. B. & Haden, D. D. (1970). Proc. N.Z. Soc. Anim. Prod. 50, 240.
Hagemeister, H. & Pfeffer, E. (1973). Z. Tierphysiol. Tierernähr. Futtermittelk. 31, 275.
Hemsley, J. A., Reis, P. J. & Downes, A. M. (1973). Aust. J. biol. Sci. 26, 961.
McDonald, I. W. & Hall, R. J. (1957). Biochem. J. 67, 400.
MacRae, J. C., Ulyatt, M. J., Pearce, P. D. & Hendtlass, J. (1972). Br. J. Nutr. 27, 39.
Miller, E. L. (1973). Proc. Nutr. Soc. 32, 79.
Offer, N. W., Evans, R. A. & Axford, R. F. E. (1971). Proc. Nutr. Soc. 30, 42A.
Preston, R. L., Schnakenberg, D. D. & Pfander, W. H. (1965). J. Nutr. 86, 287.
Reis, P. J. & Tunks, D. A. (1969). Aust. J. agric. Res. 20, 775.
Reis, P. J. & Tunks, D. A. (1970). Aust. J. biol. Sci. 23, 673.
Rimington, C. & Kay, H. D. (1926). Biochem. J. 20, 777.
Satter, L. D. & Slyter, L. L. (1974). Br. J. Nutr. 32, 199.
Schmidt, S. P., Benevenga, N. J. & Jorgensen, N. A. (1974). J. Anim. Sci. 38, 646.
Schmidt, S. P., Jorgensen, N. A. & Benevenga, N. J. (1972). J. Anim. Sci. 35, 274.
Sharma, H. R. & Ingalls, J. R. (1974). Can. J. Anim. Sci. 54, 157.
Sharma, H. R., Ingalls, J. R. & Mc>Kirdy, J. A. (1972). Can. J. Anim. Sci. 52, 363.
Sharma, H. R., Ingalls, J. R. & Parker, R. J. (1974). Can. J. Anim. Sci. 54, 305.
Smith, R. H. & McAllan, A. B. (1970). Br. J. Nutr. 24, 545.
Technicon Instruments Corporation (1967). Technicon Method Sheet N-4B. Tarrytown, New York: Technicon Instruments Corporation.
Williams, A. P. (1974). Amino acid requirements of the young bovine. Ph.D. Thesis, Reading University.
Williams, A. P., McAllan, A. B. & Smith, R. H. (1973). Proc. Nutr. Soc. 32, 85A.
Williams, A. P. & Smith, R. H. (1974). Br. J. Nutr. 32, 421.
Williams, A. P. & Smith, R. H. (1975). Proc. Nutr. Soc. 35, 43A.
Williams, P. P. & Dinusson, W. E. (1973). J. Anim. Sci. 36, 151.

Nitrogen metabolism in calves: Effect of giving different amounts of dietary casein with and without formaldehyde treatment

  • A. P. Williams (a1) and R. H. Smith (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed