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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1993;6(2): 191-195.
DOI: https://doi.org/10.5713/ajas.1993.191    Published online June 1, 1993.
Effect of fertiliser and supplementary phosphorus on the intake and digestibility of the legume Desmodium introtum
T. R. Evans, J. C. P. Severo, D. J. Minson, J. H. Ternouth
The application of fertilizer P to Desmodium intortum at 40, 60 and 100 kg/ha resulted in the P content of the legume regrowth being 0.10, 0.13 and 0.16% on a dry matter basis. When the forages were fed alone to sheep in metabolism pens the corresponding voluntary intakes by sheep of the three forages were 27.3, 42.7 and 54.3 g/Wkg0.75, respectively. Provision of additional P by rapid infusion into the rumen each morning before any fresh food was offered depressed the voluntary intake of all three feeds. It is suggested that the adverse effect of supplementary P was probably caused by an induced deficiency of either Ca or Mg and led to a reduction in microbial activity in the rumen.
Keywords: Phosphorus; Voluntary Intake; Digestibility; Desmodium intortum

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