Data for pup masses near parturition, and daily gains during early and late lactation

This file contains the data used for models of pup mass near parturition and contains the following columns: PartMass (kg), momAGE.c (maternal ages in years at weighing, centered using the mean), MidGain (kg/day for the first 20 days), LateGain (kg/day for days 20 to 35), Season (year of measurement), DTA (deviation from target age), Female (indicator variable for female), Btime.c (birthdate centered using the mean), Btime.c.sq (square of the previous term), momSPENO (unique identifier for mother), momAGE.c.sq (the square of the previous term), momAGE.log (the log transform of maternal age in years, made by subtracting the minimum age from each animal and adding a small constant), NPrevPup.c (the number of previous pups for each mother, scaled by the average number of pups at each age), PrevState (breeding state the previous season), PartMass.c (parturition mass centered according to the mean).

本文件包含用于分娩期附近幼崽体重建模的数据集，其包含以下列：幼崽分娩体重（PartMass，单位：kg）、经均值中心化处理的母畜称重年龄（momAGE.c，单位：年，即母畜称重时的年龄，以年为单位）、前20日增重速率（MidGain，单位：kg/天，对应初生后前20日的日增重）、20至35日增重速率（LateGain，单位：kg/天，对应初生后20至35日的日增重）、测量年度（Season）、目标年龄偏差（DTA）、雌性个体指示变量（Female，用于标识个体是否为雌性的二分类变量）、经均值中心化处理的出生日期（Btime.c）、校正后出生日期平方项（Btime.c.sq，即前述Btime.c的平方）、母畜唯一识别编号（momSPENO）、校正后母畜年龄平方项（momAGE.c.sq，即前述momAGE.c的平方）、对数变换后母畜年龄（momAGE.log，对母畜年龄（年）进行对数变换：先将每头母畜的年龄减去最小年龄，再添加极小常数后完成转换）、经各年龄组平均产仔数标准化的母畜既往产仔数（NPrevPup.c）、上一季繁殖状态（PrevState，即上一个繁育季的繁殖状态）、经均值中心化处理的分娩体重（PartMass.c）。