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          Case study 1: A 
survey of cattle keeping practices of the Orma tribe in eastern Kenya and levels 
of milk production 
Thomas Achia a, Damaris Yobera 
b, Patrick Irungu c 
a Department of Mathematics, 
University of Nairobi, P. O. Box 30197, Nairobi, Kenya 
b Crop Science Department, 
University of Nairobi, P.O. Box 29053, Nairobi, Kenya 
c Kenya Trypanosomiasis Research 
Institute, P.O. Box 362, Kikuyu, Kenya 
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