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Table 1 Characteristics of herds included in the study given as the median, interquartile range and range or as the count and percentage of the entire group

From: Herd-level seroprevalence of Fasciola hepatica and Ostertagia ostertagi infection in dairy cattle population in the central and northeastern Poland

 

Entire study population (n = 598)

Province

p

north-eastern (Podlaskie) (n = 394)

central (Łódzkie) (n = 204)

Herd size

21, 15–30 (10–109)

24, 17–32 (10–109)

18, 14–25 (10–100)

< 0.001

Average milk yield

5500, 460–6400 (1700–10,200)

5500, 4500–6400 (1700–10,200)

5200, 4800–6150 (3000–9360)

0.982

Grazing policy

   

< 0.001

 No grazing

264 (44.2%)

118 (30.0%)

146 (71.6%)

 6 h a day

66 (11.0%)

46 (11.7%)

20 (9.8%)

 12 h a day

179 (29.9%)

156 (39.6%)

23 (11.3%)

 24 h a day

89 (14.9%)

74 (18.7%)

15 (7.3%)

Length of grazing period in months (only grazed herds)

5 (1–8)

5 (1–8)

5 (1–7)

0.023

Main roughage

   

< 0.001

 Haylage

311 (52.0%)

273 (69.3%)

38 (18.6%)

 Corn silage

263 (44.0%)

103 (26.1%)

160 (78.4%)

 Hay

24 (4.0%)

18 (4.6%)

6 (3.0%)

Proportion of grazing grass in diet

   

< 0.001

 No grazing grass

203 (33.9%)

90 (22.8%)

113 (55.4%)

 Grazing grass < 50% of all roughage

204 (34.1%)

135 (34.3%)

69 (33.1%)

 Grazing grass > 50% of all roughage

191 (32.0%)

169 (42.9%)

22 (11.5%)