The study aims to establish some evaluation indexes of the effectiveness of different genetic groups issued from the local goat crossbreeding program. The proposed indexes adjust, for each genotype, dairy and meat performances by the reproductive parameters and metabolic weight. A total of 1654 body weights and 993 dairy performances in the caprine herd of the Arid Areas Institute of Médenine were used. Proposed bio economic indexes synthesize all studied performances through the adjustment of dairy performance and kid’s growth by reproductive parameters and kids' mortality rates. The productivity was subsequently adjusted by the average metabolic weight (P0.75) of each group to consider the relative body size and foods requirements. The application of bio-economic indexes led to a classification quite different from this based on the individual performance’s comparison. Some breeds, having high dairy performances or heavy weights at weaning, seem severely penalized by infertility or mortality rates. Moreover, the correction by the metabolic weight upsets deeply the genotypes ranking in favor of the smallest genotypes such as local goat and Murciana. Hence, the integration of the all productive components and animal behavior in evaluation criteria helps to monitor correctly genetic improvement with respect to animal resources.

Keywords: Local goat, Cross breeding, Growth, Dairy performances, Reproduction, Mortality, Metabolic weight.