Modelling and prediction of dairy sheep lactation curve using non-linear mixed effects model

Test-day record of the ewes each test-day record covered milk yield (MY) and lactation parameters as total milk yield (TMY), days in milk (DIM), first test day records (FTD), test day records (TDR), peak yield (PY) and time of peak yield (TPY)母羊泌乳日检测记录（Test-day record）：单条泌乳日检测记录涵盖产奶量（milk yield, MY）与泌乳相关参数，具体包含总产奶量（total milk yield, TMY）、泌乳天数（days in milk, DIM）、首次泌乳日检测记录（first test day records, FTD）、泌乳日检测记录（test day records, TDR）、峰值产奶量（peak yield, PY）及峰值产奶时间（time of peak yield, TPY）。