Appraisal of the sustainability of dairy goat systems in Southern Spain according to their degree of intensification

This investigation aims to classify, describe and evaluate the sustainability of dairy goat production systems (GPS) in South Spain Sierra de Cadiz. The research took place throughout 25 goat farms during the 2001-2002 campaigns, with the method posed by Masera et al. (1999) [Masera, O., Astier, M., S., Lopez-Ridaura. 1999. Sustentabilidad y manejo de recursos naturales. El marco de evaluacion MESMIS (Sustainability and natural resource management. The MESMIS evaluation framework). Mundi-Prensa, S.A., Gira, IE-UNAM, Mexico. 109 pp.] and adapted to animal production systems, as the guideline and framework to evaluate sustainability. The principal component, namely energy input from grazing (eigenvalue 1.329) which comprises the indicators total area per goat (factorial value 0.664) together with net energy obtained from grazing (factorial value 0.903) allowed to differentiate significantly between semi extensive (SES), semi intensive (SIS) and intensive (IS) goat production systems. Intensification of the GPS tends to be inefficient, especially in terms of net margin per litre of milk-produced (p < 0.05). A higher degree of adaptability of IS (64.8%) derives from a higher investment on new production strategies. Likewise, higher self-management capacity of SES (60.9%) fosters standards of productivity (76.0%) and stability (42.9%). The SIS presented the highest equity values (67.8%). On the whole, sustainability of GPS tends to decrease as the degree of intensification increases: SES=57.3%; SIS=55.7% and IS=53.1%. The reduction of the dependency on external input alongside with the optimization of natural resources management would surely improve the standard of sustainability. (c) 2005 Elsevier B.V. All rights reserved.