Skip to main content Accessibility help
×
Home

The phosphorus requirements of growing cattle consuming forage diets

  • J. H. Ternouth (a1), G. Bortolussi (a1), D. B. Coates (a2), R. E. Hendricksen (a3) and R. W. McLean (a2)...

Summary

The results of six experiments on growing cattle weighing 140–480 kg, and with liveweight gains of —0·46 to 1·11 kg/day, were reanalysed to provide estimates of their phosphorus (P) requirements. The 158 data sets were from individually penned cattle offered barley straw-based diets ad libitum with dry matter digestibilities of 0·53–O·65, or from cattle grazing tropical pastures with in vitro dry matter digestibilities ranging from 0·50 to 0·62. Various concentrations of dietary energy, nitrogen (N), calcium (Ca) and P were imposed during the course of the experiments with the penned cattle and various rates of application of P fertilizer changed the botanic and nutrient composition of the forages available to the grazing cattle. The P balances and P kinetics of the cattle were studied using 32P as a tracer.

Over the range of P intakes normally observed in cattle consuming forage diets (10–60 mg/kg LW), the coefficient of P absorption was high and not affected by age or liveweight. The regression coefficient relating P intake to P absorption was 0·77 for unsupplemented grazing cattle and 0·82 for penned supplemented cattle. When the plasma inorganic P concentrations were < 50 mg/1, urinary P excretion of the penned cattle was low, as were the endogenous faecal P losses of both the penned and grazing cattle. These losses were concluded to represent obligatory losses and were related to dry matter intake (r = 0·73) in the range 9–17 mg P/kg LW.

The total P requirements of growing cattle were estimated as g/day and g/kg DM intake from this data. The requirements of cattle consuming forage diets were 40–50% lower than those published by the Agricultural and Food Research Council (AFRC 1991), even though the same equation for the net requirements for growth was utilized.

Copyright

References

Hide All
Agricultural and Food Research Council (1991). Technical Committee on Responses to Nutrients. A reappraisal of the calcium and phosphorus requirements of sheep and cattle. Nutritional Abstracts and Reviews (Series B) 61, 573612.
Agricultural Research Council (1965). The Nutrient Requirements of Farm Livestock No 2 Ruminants. London: ARC.
Agricultural Research Council (1980). The Nutrient Requirements of Ruminant Livestock. Slough: Commonwealth Agricultural Bureau.
Bortolussi, G. (1994). Dietary nitrogen and phosphorus deficiency in cattle. PhD thesis, The University of Queensland.
Bortolussi, G., Ternouth, J. H. & McMeniman, N. P. (1992). The effects of dietary nitrogen and calcium supplementation on Bos indicus cross cattle offered low P diets. Proceedings of the Australian Society of Animal Production 19, 381384.
Bortolussi, G., Ternouth, J. H. & McMeniman, N. P. (1996). Dietary nitrogen and phosphorus depletion in cattle and their effects on liveweight gain, blood metabolite concentrations and phosphorus kinetics. Journal of Agricultural Science, Cambridge 126, 493501.
Braithwaite, G. D. (1984). Some observations on phosphorus homoeostasis and requirements of sheep. Journal of Agricultural Science, Cambridge 102, 295306.
Braithwaite, G. D. (1986). Phosphorus requirements of ewes in pregnancy and lactation. Journal of Agricultural Science, Cambridge 106, 271278.
Call, J. W., Butcher, J. E., Blake, J. T., Smart, R. A. & Shupe, J. L. (1978). Phosphorus influence on growth and reproduction of beef cattle. Journal of Animal Science 47, 216225.
Challa, J., Braithwaite, G. D. & Dhanoa, M. S. (1989). Phosphorus homoeostasis in growing calves. Journal of Agricultural Science, Cambridge 111, 217226.
Coates, D. B. & Ternouth, J. H. (1992). Phosphorus kinetics of cattle grazing tropical pastures and implications for the estimation of their phosphorus requirements. Journal of Agricultural Science, Cambridge 119, 401409.
Graham, J. F., Clark, A. J. & Hannah, M. C. (1990). The use of slow release chromic oxide (Cr2O3) capsules to examine the relationship between feed intake and faecal Cr2O3, Proceedings of the Australian Society of Animal Production 18, 481.
Hendricksen, R. E., Ternouth, J. H. & Punter, L. D. (1994). Seasonal nutrient intake and phosphorus kinetics of grazing steers in northern Australia. Australian Journal of Agricultural Research 45, 18171829.
Institut National De La Recherche Agronomique (1989). Ruminant Nutrition: Recommended Allowances and Feed Tables. (Ed. Jarrige, R.). Paris: John Libby Eurotext.
Little, D. A. (1975). Bovine body composition and phosphorus storage. PhD thesis, The University of Queensland.
Little, D. A. (1980). Observations on the phosphorus requirement of cattle for growth. Research in Veterinary Science 28, 258260.
McLean, R. W. & Ternouth, J. H. (1994). The growth and phosphorus kinetics of steers grazing a subtropical pasture. Australian Journal of Agricultural Research 45, 18311845.
Schneider, K. M., Ternouth, J. H., Sevilla, C. C. & Boston, R. C. (1985). A short-term study of calcium and phosphorus absorption in sheep fed on diets high and low in calcium and phosphorus. Australian Journal of Agricultural Research 36, 91105.
Scott, D., McLean, A. F. & Buchan, W. (1984). The effect of variation in phosphorus intake on net intestinal phosphorus absorption, salivary phosphorus secretion and pathway of excretion in sheep fed roughage diets. Quarterly Journal of Experimental Physiology 69, 439452.
Ternouth, J. H. (1989). Endogenous losses of phosphorus by sheep. Journal of Agricultural Science, Cambridge 113, 291297.
Ternouth, J. H. & Sevilla, C. C. (1990). The effects of low levels of dietary phosphorus upon the dry matter intake and metabolism of lambs. Australian Journal of Agricultural Research 41, 175184.
Ternouth, J. H., McLean, R. W., MacDonald, R. N. & Adamu, A. (1990). Field estimates of the phosphorus kinetics of grazing cattle. Proceedings of the Australian Society of Animal Production 18, 396399.
Ternouth, J. H., McLachlan, B. P., Clarke, J. M. & Thomas, B. J. (1993). Effects of dietary phosphorus and nitrogen deficiencies on the intake, growth and metabolism of lambs. Journal of Agricultural Science, Cambridge 121, 409419.
Toharamat, T. (1992). Feeding fibrous supplements tograzing dairy cattle. MAgrSc thesis, University of Queensland.
Wan Zahari, M., Thompson, J. K., Scott, D. & Buchan, W. (1990). The dietary requirements of calcium and phosphorus for growing lambs. Animal Production 50, 301307.

The phosphorus requirements of growing cattle consuming forage diets

  • J. H. Ternouth (a1), G. Bortolussi (a1), D. B. Coates (a2), R. E. Hendricksen (a3) and R. W. McLean (a2)...

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.