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The Phantom Cow Syndrome is a major impediment to achieving compact conception patterns in Victorian herds. Some inseminated cows fail to return for a further insemination even though they are not pregnant because the corpus luteum formed following insemination is maintained for an extended period. ...

Pino, C. S.; Macmillan, K. L.; Anderson, G. A.
New Zealand Society of Animal Production, Hamilton, New Zealand
Proceedings of the New Zealand Society of Animal Production, 2006, 66, pp 325-328