Balcells, J, Guada, JA, Pieró, JM 1992. Simultaneous determination of allantoin and oxypurines in biological fluids by high-performance liquid chromatography. Journal of Chromatography: Biomedical Applications 575, 153–157.
Bannink, A, Valk, H, Van Vuuren, AM 1999. Intake and excretion of sodium, potassium, and nitrogen and the effects on urine production by lactating dairy cows. Journal of Dairy Science 82, 1008–1018.
Bowen, MK 2003. Efficiency of microbial protein production in cattle grazing tropical pastures. PhD, The University of Queensland, St Lucia, Qld, Australia.
Bowen, MK, McCosker, K, McLennan, SR, Poppi, DP 2003. The development of a novel method to estimate microbial protein production in grazing Brahman crossbred cattle. Tropical and Subtropical Agroecosystems 3, 365–367.
Chen, XB, Gomes, MJ 1995. Estimation of microbial protein supply to sheep and cattle based on urinary excretion of purine derivatives: an overview of the technical details. International Feed Resources Unit, Rowett Research Institute, Bucksburn, Aberdeen, UK.
Chen, XB, Hovell, FDD, Orskov, ER, Brown, DS 1990. Excretion of purine derivatives by ruminants: effect of exogenous nucleic acid supply on purine derivative excretion by sheep. British Journal of Nutrition 63, 131–142.
Chen, XB, Susmel, P, Stefanon, BØrskov, ER 1995. On the use of purine derivatives in spot urine, plasma and milk samples as indicators of microbial protein supply in sheep and cattle. In Protein metabolism and nutrition. Proceedings of the International Symposium on Protein Metabolism and Nutrition, Vale de Santarem – Portugal (ed. AF Nunes), pp. 325–329. European Association of Animal Production, Estacao Zootecnia, Instituto Nacional de Investigacao Agraria, Portugal.
Church, DC 1979. Digestive physiology and nutrition of ruminants. Nutrition, vol. 2. O&B Books, Corvallis, OR, USA.
Corbett, JL 1976. Nutritional aspects of the growth of grazing animals. Proceedings of the Australian Society of Animal Production 11, 281–288.
Cruickshank, GJ, Poppi, DP, Sykes, AR 1992. The intake, digestion and protein degradation of grazed herbage by early weaned lambs. British Journal of Nutrition 68, 349–364.
Dixon, RM, Smith, DR, Reid, A 2003. Lithium salts as a marker of intake of supplements by cattle. Australian Journal of Experimental Agriculture 43, 37–46.
Downes, AM, McDonald, IW 1964. The chromium-51 complex of ethylenediamine tetraacetic acid as a soluble rumen marker. British Journal of Nutrition 18, 153–162.
Faichney, GJ 1975. The use of markers to partition digestion within the gastro-intestinal tract of ruminants. In Digestion and metabolism in the ruminant (ed. IW McDonald and ACI Warner), pp. 277–291. University of New England Publishing Unit, Armidale.
Faichney, GJ, Welch, RJ, Brown, GH 1995. Prediction of the excretion of allantoin and total purine derivatives by sheep from the ‘creatinine coefficient’. Journal of Agricultural Science, Cambridge 125, 425–428.
Fogh-Andersen, N 1980. Binding of the chromium-ethylenediaminetetraacetic acid complex (CrEDTA) to human albumin. Scandinavian Journal of Clinical and Laboratory Investigation 40, 805–808.
Foss Tecator 2002a. Application sub-note ASN 3805. The determination of neutral detergent fibre using the fibercap system. Foss Tecator, Hoganas, Sweden.
Foss Tecator 2002b. Application sub-note ASN 3804. The determination of acid detergent fibre using the fibercap system. Foss Tecator, Hoganas, Sweden.
Furst, A, Radding, S, Wurzel, K 1998. Chromium (Cr). In Encyclopedia of toxicology (ed. P Wexler), pp. 340–342. Academic Press, San Diego.
Genstat Committee 2000. The guide to Genstat part 2: statistics. VSN International Ltd, Oxford, UK.
Harrison, FA, Mangan, JL, Hill, KJ 1963. Absorption and excretion of lithium and magnesium in the sheep. Biochemical Journal 89, 99–100.
Lowry, JB, Sumpter, EA, McSweeney, CS, Schlink, AC, Bowden, B 1993. Phenolic acids in the fibre of some tropical grasses, effect on feed quality, and their metabolism by sheep. Australian Journal of Agricultural Research 44, 1123–1133.
Schonewille, JT, Beynen, AC 1999. Lithium chloride as a reference substance for urine collection in goats. New Zealand Veterinary Journal 47, 150–151.
Siebert, BD, Romero, VA, Hunter, RA, Megarrity, RG, Lynch, JJ, Glasgow, JD, Breen, MJ 1978. Partitioning intake and outflow of nitrogen and water in cattle grazing tropical pastures. Australian Journal of Agricultural Research 29, 631–644.
Stacy, BD, Thorburn, GD 1966. Chromium-51 ethylenediaminetetraacetate for estimation of glomerular filtration rate. Science 152, 1076–1077.
Suharyono, 1992. Estimation of dietary supplement intake in sheep, using LiCl as a marker. MSc, The University of New England, Armidale, NSW, Australia.
Sweeney, RA 1989. Generic combustion method for determination of crude protein in feeds. Journal of the Association of Official Analytical Chemists 72, 770–774.
Ulyatt, MJ 1964. The suitability of lithium as a marker for estimating rumen water volume in sheep. New Zealand Journal of Agricultural Research 7, 774–778.
Verbic, J, Chen, XB, MacLeod, NA, Ørskov, ER 1990. Excretion of purine derivatives by ruminants. Effect of microbial nucleic acid infusion on purine derivative excretion by steers. Journal of Agricultural Science, Cambridge 114, 243–248.
Walker, DMHawley, KE 1965. The measurement of the rumen fluid volume using lithium and polyethylene glycol. Proceedings of the 9th International Grassland Congress, Sao Paulo, Brazil, pp. 759–761.