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Table 1 Comparison of atypical luteal activity post partum in Irish dairy cows in 1982 [23] and in 2002 (Teagasc, unpublished)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

ISSN: 2046-0481