Check out the following resources and articles on livestock nutrition.

• Dr Kelcey Swyer's Nutrition Presentation is on pg 21-31 of this pdf file
• Nutrient Requirements for Beef Cattle from Oklahoma State Extension
• Beef Cattle Nutrition and Feeding from PennState Extension
• Feeding and Nutritional Management of Beef Cattle from Merck Veterinary
• Beef Cattle Nutrition Workbook from Oregon State University Extension
• Beef Cattle Nutrition and Feeding from Arkansas State University Extension
• Feed Composition Table from Beef Magazine
• Dry Matter Demand Table  from National Organic Program (USDA)
• Pasture Dry Matter Intake Worksheet from CCOF
• Basics of Feeding Horses from University of Nebraska-Lincoln Extension
• Nutrient Needs of Horses from Oklahoma State Extension
• NRC Requirements for Horses Database from the National Research Council
• Nutrient Management for Horses from Purdue University Extension