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The latest edition of Nutrient Requirements of Dairy Cattle includes many improvements over the 1978 edition. The most significant advance in Nutrient Requirements of Dairy Cattle is a computer program, provided on diskette, that includes all requirements for energy, protein, calcium, phosphorus, and vitamins A and D. It is compiled to run on PC-DOS or MS-DOS on IBM-compatible personal computers. A diskette accompanies each book.

Within the book, dry matter intake and energy concentration assumptions have been made more consistent from table to table. A major change involves the expression of protein requirements on the basis of degradable and undegradable intake protein and includes two systems to determine protein requirements. A new table enables users to find data for a cow that resembles their own animals and locate their specific energy, protein, and other dietary requirements. Other tables have been expanded to include data on the nutrient requirements during the 3 weeks of lactation and for cows with higher milk yields.

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Suggested Citation

National Research Council. 2000. Nutrient Requirements of Dairy Cattle,: Sixth Revised Edition, Update 1989. Washington, DC: The National Academies Press. https://doi.org/10.17226/1062.

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Publication Info

168 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/1062
Chapters skim
Front Matter i-viii
1 - Introduction 1-1
Factors Affecting Dry Matter Intake 2-4
ENERGY 5-5
Requirements of Lactating and Pregnant Cows 6-7
Requirements of Growing Animals and Mature Bulls 8-8
The Energy Value of Feeds 9-9
Units of Protein Requirement and Supply 10-10
Factors Influencing the Requirement for Absorbed Protein 11-13
Factors Influencing the Supply of Absorbed Protein 14-14
BACTERIAL AND PROTOZOAL CRUDE PROTEIN 15-15
Special Considerations for Feeding Urea 16-16
Effects on Energy Supply 17-17
Effects on Reproduction 18-18
Relation of Absorbed and Crude Protein Requirements 19-19
Calcium 20-22
Phosphorus 23-24
Sodium 25-25
Potassium 26-26
Magnesium 27-27
Sulfur 28-28
Cobalt 29-30
Copper 31-31
Iodine 32-32
Manganese 33-33
Molybdenum 34-34
SELENIUM 35-35
Zinc 36-37
Cadmium 38-38
Fluorine 39-39
Lead 40-40
Mercury 41-41
Vitamin A 42-43
Vitamin D 44-44
Vitamin E 45-45
Vitamin K 46-46
Niacin 47-47
Pyridoxine 48-48
WATER 49-51
Ketosis 52-52
FAT 53-54
FIBER 55-55
Cow Diets 56-57
Feeding Recommendations 58-58
BRANCHED-CHAIN FATTY ACIDS AND N-VALERIC ACID 59-59
ANTIBIOTICS 60-60
HORMONES 61-62
Energy, Crude Protein, Calcium, and Phosphorus 63-64
Undegraded and Degraded Intake Protein Calculations 65-65
OTHER NUTRIENTS 66-66
Mineral and Vitamin Supplementation 67-67
Using Table 6-5 Data for Nonlactating Dairy Animals: Example 4 68-68
COMPUTER-FORMULATED RATIONS 69-70
5 - Prediction Equations 71-77
DRY MATTER INTAKE REQUIREMENTS 78-78
Lactating and Pregnant Cows 79-79
MAXIMUM TOLERABLE DIETARY LEVELS OF CERTAIN ELEMENTS 80-88
7 - Composition of Feeds 89-115
References 116-137
Appendix Tables 138-147
Index 148-157

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