Abbreviations: ADF, acid detergent fibre; ADL, acid detergent lignin; AECP, truly absorbed rumen endogenous protein in the small intestine; AMCP, truly absorbed microbial protein in the small intestine; ARUP, truly absorbed rumen undegradable protein in the small intestine; BSt, rumen bypass or undegraded feed starch; CHO, carbohydrates; CP, crude protein; D, degradable fraction; dBNDF, intestinal digestibility of rumen bypass neutral detergent fibre; dBST, intestinal digestibility of rumen bypass starch; DE 1× , digestible energy at production level of intake (1×); DM, dry matter; DPB, rumen degraded protein balance; ECP, rumen endogenous protein; EDNDF, effective degraded neutral detergent fibre; EDST, effective degraded starch; EE, ether extract (crude fat); FMV, feed milk value; IDBNDF, intestinal digested rumen bypass neutral detergent fibre; IDBST, intestinal digested rumen bypass starch; K d , rumen degradation rate; MCP RDP , microbial protein synthesized in the rumen based on available protein; MCP TDN , rumen synthesized microbial protein base on available TDN; ME, metabolizable energy at production level of intake; MP, metabolizable protein; NDF, neutral detergent fibre; NE g , net energy for growth; NE L3× , net energy for lactation at production level of intake (3×); NE m , net energy for maintenance; NSC, non-structural carbohydrates; NSC, non-structural CHO; OM, organic matter; RUNDF, rumen bypass or undegraded feed neutral detergent fibre; RUP, rumen undegradable feed crude protein; S, soluble fraction in the in situ incubation; ST, starch; T0, lag time; tdCP, truly digestible crude protein; TDN 1× , total digestible nutrient at one time maintenance; TDNDF, total digested neutral detergent fibre; tdNDF, truly digestible neutral detergent fibre; tdNFC, truly digestible non-fibre carbohydrate; TDST, total digested starch; uNDF 288h , undigestible neutral detergent fibre at 288h based on CNCPS 6.5.
