A systems analysis of inter-annual changes in the pattern of sheep flock productivity in Tanzanian livestock research centres

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dc.creatorRey, B.
dc.creatorDas, S.M.
dc.date1997-02
dc.date2015-06-05T12:17:04Z
dc.date2015-06-05T12:17:04Z
dc.date.accessioned2026-06-27T18:55:45Z
dc.descriptionAnnual estimates of production traits over a 22 year period (1965-1987) for Black Head Persian sheep (BHP) from Malya and West Kilimanjaro research centers in Tanzania were utilized to analyse variation of flock productivity over time. Principal component analysis was used to anlyse the variation of flock productivity over time. Principal component analysis indicated major trends in the variation of trait combinations, while cluster analysis was used to identify years with similar patterns in the combination of traits. The paper discusses the historical pattern, which is identified. It appears that productivity patterns were only weakly related to ecological changes, but were more strongly related to management factors. The approach and analytical technique employed are recommended as tools in livestock systems diagnostic research.
dc.identifierhttps://hdl.handle.net/10568/66665
dc.identifier.urihttp://hdl.handle.net/123456789/165657
dc.languageen
dc.publisherElsevier
dc.rightsLimited Access
dc.sourceRey, B. and Das, S.M. 1997. A systems analysis of inter-annual changes in the pattern of sheep flock productivity in Tanzanian livestock research centres. Agricultural Systems 53(2-3): 175-190.
dc.subjectlivestock
dc.subjectresearch
dc.subjectsheep
dc.subjectreproduction
dc.subjectenvironment
dc.subjectanimal production
dc.subjectgrowth
dc.subjectproductivity
dc.subjectsystems analysis
dc.titleA systems analysis of inter-annual changes in the pattern of sheep flock productivity in Tanzanian livestock research centres
dc.typeJournal Article

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