ESTIMATES OF PRE- AND PERINATAL MORTALITY IN THE NEW ZEALAND ROMNEY MARSH EWE
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Summary.
Estimates of pre- and perinatal loss in parous and non-parous 2½-year-old ewes which conceived to a second or third mating are described. This paper is a continuation of the study on losses in New Zealand Romney Marsh ewes that conceived to one service (Quinlivan, Martin, Taylor & Cairney, 1966).
The data presented show the estimated mean prenatal loss (excluding non-fertilization) for parous and non-parous ewes, that conceived to second service, to be 25·7%. From a consideration of lambs born dead the total estimated pre- and perinatal loss amounts to 47·9%.
The percentage of ewes exhibiting genital tract abnormalities is considered and shows that 1% and 6·6% of the parous ewes in the 1963 and 1964 observations respectively, and 6% and 15% of the non-parous ewes in the two observations revealed some abnormality at autopsy.
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Print ISSN: 1470-1626
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