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There are tremendous benefits to feeding ruminants nitrogen and phosphorus supplements, in terms of milk production and productivity. However what goes in, must also come out. Nitrogen and phosphorus excretions from dairy cattle are a major environmental pollutant. This book describes the latest knowledge in nitrogen and phosphorus nutrition of cattle including requirements, ruminal and total tract metabolism, possibilities of increasing the efficiency of nitrogen utilization and reducing nitrogen and phosphorus excretions from dairy and beef operations. It also includes aspects of the effects of dietary nitrogen and phosphorus on the reproductive efficiency of cattle.
Interactions between Cattle and the Environment: A General Introduction, E Pfeffer, Institut fur Tiererndhrung, Bonn, Germany, and A N Hristov, University of Idaho, Moscow, USA; Nitrogen Requirements of Cattle, C G Schwab, University of New Hampshire, Durham, USA, P Huhtanen, MTT Agrifood Research Centre, Jokionen, Finland, C W Hunt, University of Idaho, Moscow, USA, and T Hvelplund, Institute Agricultural Sciences, Tjele, Denmark; Nitrogen Metabolism in the Rumen, N D Walker, AgResearch, Palmerston North, New Zealand, C J Newbold, University of Wales, Aberystwyth, UK, and R J Wallace, Rowett Research Institute, Aberdeen, UK; Factors Affecting the Efficiency of Nitrogen Utilization in the Rumen, A N Hristov, J-P Jouany, Inst National de la Recherche Agronomique, Saint Genes Champanelle, France; Whole Animal Nitrogen Balance in Cattle, J L Firkins, Ohio State University, Columbus, USA, and C Reynolds, Ohio State University, Wooster, USA; Phosphorus Metabolism in the Rumen, R L Kincaid, Washington State University, Pullman, USA, and M Rodehutscord, Martin-Luther-Universitat Halle Wittenberg, Germany; Phosphorus Metabolism in Ruminants and Requirements of Cattle, E Pfeffer, D K Beede, Michigan State University, East Lansing, USA, and H Valk, I D TNO Animal Nutrition, Lelystad, The Netherlands; Effects of Dietary Phosphorus and Nitrogen on Cattle Reproduction, J D Ferguson, University of Pennsylvania, Philadelphia, USA, and D Skian, Hebrew University, Rehovot, Israel; Improving the Efficiency of Nutrient Use on Cattle Operations, J Schroder and A Bannick, Wageningen University and Research Centre, Wageningen, The Netherlands, R Kohn, University of Maryland, College Park, USA
Edited by A Hristov, University of Idaho, USA; E Pfeffer, Institut fur Tierernahrung, Universitat Bonn, Germany