The average values of the slopes are regarded as an exponent number n of 0.58, 0.60 and 0.66 respectively, in the three environments, as assumed that the slope of the weight gain curves in each environment is constant irrespective of tested temperatures. The parabolic rate constant kp′ is often described by n = 0.5 in Eq. (1). In this case, the weight gain rate constant kp should be moderated in Eq. (2), as n is considered to be different between those in the environments,