01633naa a2200181 a 450000100080000000500110000800800410001910000200006024502310008026000090031152009580032065000140127865000100129265000180130265000150132070000180133577300980135313658062012-01-02       1973    bl ---       0--  u    #d1 aTHORNTON, F. R.  aEffects of soils, fertilizers and stocking rates on pastures and beef production on the Wallum of south-eastern Queenslandb3 - relation of liveweight changes to chemical composition of blod and pasture.h[electronic resource]  c1973  aDuring the concluding phase of a six-year grazing trial a study was made of the steers and the pasture material from paddocks annually fertilized with 125kg ha -1 of superphosphate. Plucked pasture samples from the low and high superphosphate treatments contained 0.11 and 0.15 per cent phosphorus, 0.83 and 0.91 per cent nitrogen and 0.12 and 0.12 per cent sulphur, respectively. The N:S ratio of these samples were 6.8 and 7.6 and the in vitro digestibilities were 41.6 and 44.9 per cent. There were marked seasonal patterns in the concentrations of all componentes with minimun values in the winter months, when liveweight gain was lowest. Greater superphosphate application increased mean liveweight gain (0.29 to 0.41kg head -1 day -1), mean plasma concentrations of both urea-niotrogen (6.3 vs 5.0mg 100 ml -1) and of phosphorus (6.7 vs 6.3mg 100 ml -1). The mean blood sulphate-sulfur concentration of 28 ug ml -1 was not influenced by treatment.  alivestock  aCarne  aGado de Corte  aProdução1 aMINSON, D. J.  tAustralian Journal of Experimental Agriculture and Animal Husbandrygv. 13, p. 537-543, 1973.