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Ruminant production in the dry subtropics: constraint and potentials Proc. of the Intern. symp. on the constraints a. possibilities of ruminant production in the dry subtropics (MOA of Egypt, ESAP, EAAP, FAO, ICAMAS, WAAP), Cairo, Egypt, 5-7 N,OV. 1988 E. S. E. Galal et al (comp.)