01930naa a2200265 a 450000100080000000500110000800800410001902000150006010000270007524501210010226000090022352010700023265000220130265000150132465000100133965000110134965000280136065000290138865000120141765000130142965000260144265300230146870000160149177301570150720429812016-04-08       2000    bl uuuu     u00u1 u    #d  a28414803991 aVALENCIA-CASTRO, C. M.  aSustentability of marginal goat production systems based on arid rangelands in a tropical countrybmyth or reality?.  c2000  aResults of this study establish that goat production was not related to over-grazing or erosion. On the contrary, goat production is developed under marginal conditions, and makes use of range bio-diversity, mainly on the bush stratum, a fact that enhance its position to be considered as an activity ecologically sustainable. In order to warrants its economic and ecological sustainability, goat production must transit from a low productivity scenario to other of higher productivity, the last by exerting a low degree of artificialization of the production system. In this way, the sustainability of the natural goat production system based on arid rangelands in northern Mexico would be considered not a myth but a reality. Table 1. Matrix correlation vectors for environmental variables integration linear combinations in each index; Table 2. Matrix correlation vectors for livestock inventory and socio-economic variables integrating linear combinations from each index; Table 3. Correlations analyses among indices generated from principal component analyses  aAnimal production  aArid zones  aGoats  aMexico  aSustainable agriculture  aAgricultura sustentável  aCaprino  aPastagem  aSistema de produção  aProduction systems1 aMEZA, C. A.  tIn: INTERNATIONAL CONFERENCE ON GOATS, 7., 2000, Tours, Poitiers, France. Proceedings... Paris: INRA: IGA: Institut de Elevage, 2000.gv. 2, p. 781-783.