Application of the logistical and Gompertz models to the analysis of live weight curves in Cuban Creole kids


Growth curves in Cuban creole kids were studied adjusted to the logistical and Gompertz models through the application of elasticity calculation and their biological interpretations. The elasticity was calculated by the expression ?= dy/dx . x/y . The range where the adjusted model was elastic (> 1) was considered as growth peak period. From the models the adjusted and potential adult weight, the highest growth rate and the age at which is reached, were estimated. In both models significant values were recorded in the adjustments, with coefficients of determination higher than 98% and the typical error of the estimations, with values between 1371 and 1711 g. The adult adjusted weight was of 36. 522 and 31.354 kg for males and females, respectively, according to the logistical model and in regard to the Gompertz model, corresponded to 40.373 and 34.297 kg for males and females, respectively. The analysis of elasticity of both models were effective to estimate the limits and the duration of the growth peak period, which was extended from 165 to 193 d, and ended between 225 and 260 d of age, when the animals attained live weights around 20 and 26 kg, for females and males, respectively. Daily live weight gains were of 70 g for both sexes at the beginning of the growth peak and at its end of 93 to 104 g daily, for females and males, respectively.
Key words: growth, elasticity, goats, Criollas

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