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Table 1 Descriptive data of herds that took part in the study. Study herds are classified in relation to region, origin of stock bulls, enterprise, vasectomized bulls in the farm, calving season, herd size and vaccination status. The proportion of herds within bull categories (no bull, 1 bull, >1 bull) across herd classifications is shown below

From: Prevalence of BoHV-1 seropositive and BVD virus positive bulls on Irish dairy farms and associations between bull purchase and herd status

Herd classification No bull 1 bull >1 bull
(n) % (n) % (n) % (n)
Overall proportion of herds 23 % (70) 36 % (109) 41 % (126)
Region
 Region 1 (99) 29 % (29) 33 % (33) 37 % (37)
 Region 2 (206) 20 % (41) 37 % (76) 43 % (89)
Herds with all bulls were homebred
 All bulls homebred (68)   35 % (24) 65 % (44)
 Purchased bulls (167)   51 % (85) 49 % (82)
Enterprise
 Dairy only (140) 25 % (35) 34 % (48) 41 % (57)
 Mixed livestock species (164) 21 % (35) 37 % (60) 42 % (69)
Herds with vasectomized bulls
 Vasectomized bulls (41)   20 % (8) 81 % (33)
 No Vasectomized (194)   52 % (101) 48 % (93)
Calving season
 Spring (265) 21 % (56) 35 % (92) 44 % (117)
 Not spring (40) 35 % (14) 42 % (17) 23 % (9)
Size score
 31–65 cows (81) 26 % (21) 48 % (39) 26 % (21)
 66–99 cows (98) 27 % (26) 39 % (38) 35 % (34)
  > 99 cows (126) 18 % (23) 25 % (32) 56 % (71)
BVD Vaccine
 Yes (187) 22 % (41) 35 % (65) 43 % (81)
 No (118) 25 % (29) 37 % (44) 38 % (45)
IBR Vaccine
 Yes (36) 22 % (8) 22 % (8) 56 % (20)
 No (269) 23 % (62) 38 % (101) 39 % (106)