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Abstract
Extract
Field survey data collected in 1954 and 1955 covering some 120,000 ewes on 117 farms in various parts of the South Island of New Zealand indicated that the incidence of vaginal prolapse was appreciably higher on hill and downs country than on flat country. In view of its possible significance in the aetiology of the disease (McLean, Citation1956a), it was decided to examine this finding more closely by ascertaining the incidence on an unselected sample of farms on downs and on the flat, which were as alike as possible with regard to district, breed of sheep, carrying capacity, pasture type, lambing percentage, and general husbandry and breeding practice; that is, differing as far as possible only in respect of topography. Statistical examination of previous data indicated that about 12 to 15 farms on each of the two types of country would be necessary to give reliable results.