note related to this contribution
| - T F Randolph, P M Kristjanson, A N Odero, P K Thornton, R S Reid and T Robinson are at the International Livestock Research Institute (ILRI), PO Box 30709, Nairobi, Kenya; tel: +254 2 630 743; fax +254 2 631 499; email: p.thornton@cgiar.org. S W Omamo, formerly of ILRI, is now a research fellow with ISNAR in Uganda. J G Ryan is a consultant, Aranda, Australia.
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