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7.2 The Effect of Forage Species and Stocking Rate on Protein Supply to the Duodenum of Cattle

  • H. R. Losada (a1), S. B. Cammell (a1), D. E. Beever (a1) and A. R. Austin (a1)

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Whilst the quantity and nature of the forage available to grazing ruminants is known to vary quite dramatically throughout the growing season, there are still surprisingly few data on the energy and protein value of such materials and, consequently, supplementation of such diets to maintain high levels of animal performance remains empirical.

The recent development of portable equipment for the continuous intraruminal infusion of digesta markers (Corbett, Furnival, Inskip, Perez and Pickering, 1976; Evans, Hayes and Beever, 1981) and the automatic collection of duodenal digesta from T-piece cannulated cattle (Evans, Skelton and Beever, 1981) have, however, provided reliable means by which the flow of nutrients to the small intestine can be measured in grazing sheep (Corbett, Furnival, Inskip and Pickering, 1982) and cattle (Ulyatt, Beever, Thomson, Evans and Haines, 1980). The work reported in this paper is a continuation of the study commenced by Ulyatt et al. (1980), with the objective of this experiment being to examine the digestion of pure swards of perennial ryegrass and of white clover throughout the season when offered at two allowances to young growing cattle.

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References

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Corbett, J. L., Furnival, E. P., Inskip, M. W., Perez, C. J. and Pickering, F. S. 1976. Nutrition and growth of lambs grazing lucerne and phalaris. Proc. Aust. Soc. Anim. Prod. 11: 329332.
Corbett, J. L., Furnival, E. P., Inskip, M. W. and Pickering, F. S. 1982. Protein digestion in grazing sheep. In Forage Protein in Ruminant Animal Production (ed. Thomson, D. J., Beever, D. E. and Gunn, R. G.), Occ. Publ. Br. Soc. Anim. Prod. No. 6.
Evans, R. T., Hayes, D. G. and Beever, D. E. 1981. A portable pump for the intraruminal infusion of markers into grazing ruminants. Lab. Pract. 30(6): 591593.
Evans, R. T., Skelton, K. V. and Beever, D. E. 1981. Portable equipment for the automatic sampling of duodenal contents from housed or grazing cattle. Lab. Pract. 30(10): 9971000.
Ulyatt, M. J., Beever, D. E., Thomson, D. J., Evans, R. T. and Haines, M. J. 1980. Measurement of nutrient supply at pasture. Proc. Nutr. Soc. 39: 67A.

7.2 The Effect of Forage Species and Stocking Rate on Protein Supply to the Duodenum of Cattle

  • H. R. Losada (a1), S. B. Cammell (a1), D. E. Beever (a1) and A. R. Austin (a1)

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