There are tremendous benefits to feeding ruminants nitrogen and phosphorus supplements, in terms of milk production and productivity. However, what goes in must 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. This book will be of interest to researchers in animal nutrition, animal science, and environmental (pollution) science.
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vi | |
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Interactions between Cattle and the Environment: a General Introduction |
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1 | (12) |
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Nitrogen Requirements of Cattle |
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13 | (58) |
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Nitrogen Metabolism in the Rumen |
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71 | (46) |
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Factors Affecting the Efficiency of Nitrogen Utilization in the Rumen |
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117 | (50) |
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Whole-animal Nitrogen Balance in Cattle |
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167 | (20) |
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Phosphorus Metabolism in the Rumen |
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187 | (8) |
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Phosphorus Metabolism in Ruminants and Requirements of Cattle |
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195 | (38) |
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Effects of Dietary Phosphorus and Nitrogen on Cattle Reproduction |
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233 | (22) |
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Improving the Efficiency of Nutrient Use on Cattle Operations |
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255 | (26) |
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| Index |
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281 | |
Dr. Alexander N. Hristov is a Distinguished Professor of Dairy Nutrition in the Department of Animal Science at The Pennsylvania State University and is a member of several professional societies and of the Feed Composition Committee of the National Animal Nutrition Program. He has a B.S. from the Higher Institute of Zooengineering and Veterinary Medicine, Stara Zagora, Bulgaria, and a Ph.D. in Animal Nutrition from the Bulgarian Academy of Agricultural Sciences. Hristov has worked as a research scientist at the Institute of Animal Sciences, Kostinbrod, Bulgaria, the USDA-ARS Dairy Forage Research Center in Madison, WI, and the Ag Canada Research Center in Lethbridge, AB. He was on the faculty at the Department of Animal and Veterinary Science, University of Idaho from 1999 to 2008 and is at Penn State since 2008. Hristov's main research interests are in the areas of mitigation of nutrient losses and gaseous emissions from dairy operations and protein and amino acid nutrition of dairy cattle. He initiated and led the development of the world's first Dairy MOOC (Massive Open Online Course) with a current enrollment of over 57,000 (https://www.coursera.org/learn/dairy-production). Hristov has given over 110 invited presentations and published over 220 books, book chapters, and peer-reviewed journal articles with over 20,000 citations and all-time Google Scholar h-index of 78 and i10-index of 195.
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