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Table 1 Comparison of atypical luteal activity post partum in Irish dairy cows in 1982 [23] and in 2002 (Teagasc, unpublished)

From: Temporal trends in reproductive performance in Irish dairy herds and associated risk factors

Atypical progesterone profile 1982 (463 cows) 2002 (396 cows)
Delayed onset of ovulation (%) a 7 15
Prolonged luteal phase (%) b 3 10
Anovulation following cyclicity (%) c 3 1
TOTAL (%) 13 26
  1. a 1982 (to day 50); 2002 (to day 45), b 1982 (≥20 days); 2002 (≥19 days),
  2. c 1982 (≥14 days); 2002 (≥12 days).