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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. SBW is shrunk body weight; N is number of animals; and DOP is days on pasture. SUPPLY OF NUTRIENTSAmounts are computed from actual dry matter intake when available or from predicted intake equation. Risk of use increases when predicted intakes are used versus actual DMI. Level OneENERGYRation energy values are computed by summing the energy contribution of each feed to arrive at a total energy content of the ration, using tabular energy values. Tabular energy values used include % TDN, ME (Mcal/kg), NEma (Mcal/kg), and NEga (Mcal/kg). PROTEINSupply of metabolizable protein (MP) is the sum of digested ruminally undegraded feed protein and digested microbial protein. Feed composition parameters used include percentage CP, percentage UIP, and percentage DIP. Undegraded available feed protein is assumed to be 80 percent digestible. Hence, 
The contribution of microbial protein to the MP supply is estimated from the microbial crude protein yield. 
where MCP is microbial crude protein, g/d; eNDFadj is 1.0 if the effective NDF (eNDF) of the ration is >20%; eNDFadj is 1.0-((20-eNDF) * 0.025) when eNDF =20%; TDN is total digestible nutrients, g/d; MCP is assumed to be 80% true protein and 80% digestible, hence, 
Level TwoLevel 2 computes amino acid requirements and predicts energy and protein supply from feed physical and chemical properties. All energy and protein requirements are the same as level 1.) AMINO ACID REQUIREMENTS FOR MAINTENANCE
where MPmaint is metabolizable protein required for maintenance, g/d; MPAAi is metabolizable requirement for the ith absorbed amino acid, g/day; AATISSi is amino acid composition of tissue, Table 10–5. AMINO ACID REQUIREMENTS FOR GROWTH
where PB is protein content of empty body gain, g/100g; EBG is empty body gain, g/d; RPN is net protein required for growth, g/d; RPAAi=growth requirement for the ith absorbed amino acid, g/d. AATISSi is amino acid composition of tissue (Table 10–5); EAAGi is efficiency of use of the ith amino acid for growth (Table 10–6), g/g, and AMINO ACID REQUIREMENTS FOR LACTATION
where AALACTi is the ith amino acid content of milk true protein, g/100g (Table 10–6); Table 10–5 Amino Acid Composition of Tissue and Milk Protein (g/100 g of protein)
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