COMPARATIVE STUDY OF LACTATION CURVES IN CROSSBRED DAIRY CATTLE
Mathew Sebastian and K. C. George
Data comprising 264 normal lactation records of 148 Jersey and Brown Swiss crossbred cows being mentioned at the University Livestock Farm, Mannuthy, were analysed to compare the relative efficiency of exponential, parabolic exponential quadratic, quadratic-cum-log, gamma and inverse polynomial functions of lactation curve and to select the best one. Exponential, parabolic exponential and quadratic functions explained only the declining trend and could not define the shape of lactation curve efficiency. Gamma and quadratic-cum-log functions provided better fit than the other functions. Inverse polynomial function was found to be the least fitting in both the genetic groups.