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Table 1 Descriptive statistics (median with inter-quartile range within parenthesis) for herds classified in thirds according to frequency of repeat breeder (RB)a.

From: Characterisation of the Repeat Breeding Syndrome in Swedish Dairy Cattle

Variable RB-class 1 (n = 489) RB-class 2 (n = 527) RB-class 3 (n = 525)
RB % 2.4 (0–3.8) 7.5 (5.9–9.1) 15.4 (12.5–19.0)
Herd size 31 (26–40) 30 (23–42) 28 (21–37)
Herd average FCM23b 27.8 (25.8–29.8) 27.9 (26.2–29.9) 28.0 (25.9–29.9)
Herd average days from calving to 1st AI 82.6 (75.4–90.4) 79.3 (73.3–87.2) 77.1 (71.1–83.9)
Herd incidence reproductive disorders 0.04 (0.00–0.07) 0.04 (0.00–0.07) 0.04 (0.00–0.08)
Voluntary waiting period 55 (50–61) 55 (50–59) 53 (48–58)
Prebreeding estrus detection efficiency 0.51 (0.39–0.61) 0.53 (0.43–0.63) 0.55 (0.45–0.65)
Postbreeding estrus detection efficiency 0.57 (0.43–0.70) 0.58 (0.45–0.70) 0.58 (0.47–0.69)
  1. a Thresholds used were 5.0% and 10.7%, respectively
  2. b Average of daily fat-corrected milk yield recorded at 2nd and 3rd official test-month after calving