Observations on dystocia in a romney flock
作者:
K.D. McSporran,
R. Buchanan,
E.D. Fielden,
期刊:
New Zealand Veterinary Journal
(Taylor Available online 1977)
卷期:
Volume 25,
issue 9
页码: 247-251
ISSN:0048-0169
年代: 1977
DOI:10.1080/00480169.1977.34419
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The mating and lambing records for 1964–1972 of a Romney stud that had been experiencing a serious dystocia problem were investigated. Until 1970 between 20 and 31% of ewes required assistance at lambing but this level then fell to 18% in 1971, 11% in 1972, 3.3% in 1973 and 4.0% in 1974. The decline in dystocia evident in the latter years of the investigation is considered to have been brought about largely by the culling of ewes that were repeatedly assisted at parturition and by the selection of rams that sired lambs of lower birth weight.
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