Livestock and pasture in natural ecosystems are always interacting with each other and as long as the livestock population in each ecosystem is proportional to its capacity, its valuable resources such as soil, water and plants are not damaged. Rangeland exploitation and their maintenance is required efficient planning and management. Determining allowable use of the dominant species and key species is one of the most essential tasks of rangeland management and breeding. The purpose of this book is to determine allowable use of the dominant species in steppe and desert rangelands of Iran.

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