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To identify some genetic specificities of goat meat production in southern Tunisia, 16 years field growth data of 1687 kids were analysed. Data distribution was studied to establish the performance regrouping pattern towards oasian breeding conditions depending on the kid’s age. The average kid’s weight was 3.11 and 13.14 kg, respectively, at birth and at three months of age. The standard deviation of those phenotypic varied largely between 0.78 and 3.25 kg, respectively, at birth and at three months of age. Thus, goat data variation changes in relation to the phenotype. Environmental harsh conditions prevent the complete expression of the better animal genotypes.