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Parameter Names for Descnbing Protein Metabolism Parameter names for the fractions, or pools, and transfer coefficients that are compatible with computer use are suggested. A maximum of six characters is al- lowecl in Fortran programming. Only letters and num- bers are allowed, and a letter must be the first character; other characters in common use, such as parentheses and subscripts, are not acceptable. Terms for fractions, or pools, are limited to three characters and generally have units of mass/unit of time, such as grams or kilo- grams/clay. Terms for transfer coefficients are limited to six characters with an implied slash separating the final fraction from the initial fraction and have proportional units. Fractions making up maintenance and produc- tion requirements are explicitly described as being in ei- ther units of absorbed or net protein. The word ah- sorbed means the protein absorber] from the digestive tract. Absorbed is generally synonomous with metabo- lizable, but metabolizable was not used because its meaning relative to protein metabolism differs from that relative to energy metabolism. Net means the ac- tual protein in that fraction. The word crude means N x 6.25. Names are intended to be consistent with the energy terms used in Nutritional Energetics of Domestic Animals and Glossary of Energy Terms (National Re- search Council [NRC], 1981~. Many of the names cur- rently used in either the Agricultural Research Council (ARC, 1980) or Proteines Digestibles dans I'Intestin (PDI) (Verite et al., 1979) systems do not meet these re- quirements. FRACTIONS OR POOLS Term Meaning AP ATDN Absorbed protein Adjusted total digestible nutrients (de- creased 8 percent as relative units) 4 Term Meaning BCP BTDN BTP DBP DIP DM DMI DNP DOM DUP FOM FP FPA FERN IBP IDM IDMI IIP INP Bacterial (and protozoa!) crude protein Baseline total digestible nutrients (1 x maintenance) Bacterial (and protozoa!) true protein Digestible (true) bacterial (and proto zoal) protein Degracled intake (crude) protein (ru men) Dry matter Dry matter intake Digestible nucleic (acid crude) protein (intestine) (Apparently) digested organic matter (total tract) Digestible undegraded (crude) protein (intestine) (Apparently) fermented organic mat ter (rumen) Fecal (crude) protein (Metabolic) fecal protein (in) absorbed (protein units) (Metabolic) fecal protein (in) net (pro tein units) Indigestible (true) bacterial (and pro tozoal) protein Indigestible dry matter (total tract) Indigestbile dry matter (total tract) in take Indigestible intake (crude) protein (from ADIN or PIN analysis Indigestible nucleic (acid crude) pro tein (intestine) IOM (Apparently) indigestible organic mat ter (total tract) (Apparently) indigestible organic mat ter (total tract) intake IOMI

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Parameter Names for Describing Protein Metabolism 5 Term Meaning Term Meaning IF IUP LEA LPI LPN MPA MEN NCP NEL RAP REP RIP RP RPA RPN SOP SPA SPN STP TDN UP UIP UPA UPN YPA YEN Intake (crude) protein Indigestible undegraded (crude) pro- tein (intestine) Lactation protein (in) absorbed (pro- tein units) Lactation protein increment (LPA- LPN) Lactation protein (in) net (protein units) Maintenance protein (in) absorbed (protein units) Maintenance protein (in) net (protein units) Nucleic (acid) crude protein Net energy (for) lactation Ruminally available (nitrogen as) pro- tein Rumen efflux (crude) protein (ammo- nia if positive, urea influx if negative) Rumen influx (crude) protein (urea if positive, ammonia efflux if negative) Recycled (nitrogen as) protein Retained protein (in) absorbed (pro- tein units) Retained protein (in) net (protein units) Small (intestine) crude protein (BCP + UIP) Surface protein (in) absorbed (protein units) Surface protein (in) net (protein units) Small (intestine) true protein (BTP + UIP) Total digestible nutrients Urinary (crude) protein Undegraded intake (crude) protein (Endogenous) urinary protein (in) ab- sorbed (protein units) (Endogenous) urinary protein (in) net (protein units) Conceptus protein (in) absorbed (pro- tein units) Conceptus protein (in) net (protein units) TRANSFER COEFFICIENTS Term Meaning BCPDIP Bacterial (and protozoa!) crude pro- tein/degraded intake (crude) protein DIPIP F PIP IIPIP IPDM BCPDOM Bacterial (and protozoa!) crude pro tein/(apparently) digested organic matter BCPFOM Bacterial (and protozoa!) crude pro tein/(apparently) fermented organic matter BCPNEL Bacterial (and protozoa!) crude pro tein/net energy lactation BCPRAP Bacterial (and protozoa!) crude pro tein/ruminally available (nitrogen as) protein BCPTDN Bacterial (and protozoa!) crude pro tein/total digestible nutrients BTPBCP Bacterial (and protozoa!) true protein/ bacterial (and protozoa!) crude pro tein DBPBCP Digestible bacterial (and protozoa! true) protein/bacterial (and proto zoal) crude protein DBPBTP Digestible bacterial (and protozoa! true) protein/bacterial (and proto zoal) true protein Degraded intake (crude) protein/in take (crude) protein DNPNCP Digestible nucleic (acid crude) protein/ nucleic (acid) crude protein DOMDM (Apparently) digested organic matter (total tract)/dry matter DUPUIP Digestible undegraded (crude) pro tein/undegraded intake (crude) pro tein FOMDOM (Apparently) fermented organic mat ter (rumen)/(apparently) digested or ganic matter (total tract) FPADM Fecal (metabolic) protein (in) absorbed (protein units)/dry matter FPAIDM Fecal (metabolic) protein (in) absorbed (protein units)/ indigestible dry mat ter FPAIOM Fecal (metabolic) protein (in) absorbed (protein units)/(apparently) indigesti ble organic matter (total tract) Fecal (crude) protein/intake (crude) protein FPNDM Fecal (metabolic) protein (in) net (pro tein units)/dry matter FPNFPA Fecal (metabolic) protein (in) net (pro tein 1lnits)/fecal (metabolic) protein (in) absorbed (protein units) Indigestible intake (cruder protein/in take (crude) protein Intake (crude) protein/dry matter

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6 Ruminant Nitrogen Usage Term Meaning Term Meaning LPNIP Lactation protein (in) net (protein SPNSPA Surface protein (in) net (protein units)/ units)/intake (crude) protein surface protein (in) absorbed (protein LPNLPA Lactation protein (in) net (protein units) units)/lactation protein (in) absorbed UIPIP ~ndegraded intake (crude) protein/in (protein units) take (crude) protein MPNMPA Maintenance protein (in) net (protein UPIP Urinary (crude) protein/intake (crude) units)/maintenance protein (in) ah- protein sorbed protein unite) UPNUPA Urinary (endogenous) protein (in) net NCPBCP Nucleic (acid) crude protein/bacterial (protein units)/urinary (endogenous) (and protozoa!) crude protein protein (in) absorbed (protein units) RIPIP Rumen influx (crude) protein/intake YPNYPA Conceptus protein (in) net (protein (crude) protein units)/conceptus protein (in) ab RPNRPA Retained protein (in) net (protein sorbed (protein units) units)/retained protein (in) absorbed (protein units)