You are viewing the site in preview mode
Skip to main content
Variable/category
Full model
Final model 1
Final model 2
Coeff.
SE
Wald
Coeff.
SE
Wald
LRT
Coeff.
SE
Wald
LRT
(Intercept)
− 1.00
2.59
0.70
− 1.10
1.00
0.27
− 1.75
0.91
0.05
Suckling period (days)
≤ 21
≥ 22
− 1.53
1.02
0.13
− 1.37
0.80
0.09
0.08
− 1.49
0.71
0.04
0.03
Sows—genetic
Danbred
BHZP or Topigs
− 1.27
1.02
0.22
PIC, Hülsenberger, Hermitage, other
− 1.97
1.08
0.07
Time interval between purchase of gilts (weeks)
< 9
9
− 1.63
1.38
0.24
− 0.72
0.95
0.45
0.06
10–52
− 2.55
1.10
0.02
− 1.82
0.84
0.03
Time interval in which sows are sent to slaughter (weeks)
0.08
0.29
0.79
Time interval between pick-up of carcasses (days)
0.02
0.10
0.83
Distance between sow barn and pick-up location for carcasses (m)
− 0.02
0.01
0.09
− 0.02
0.01
0.03
0.01
− 0.01
0.01
0.06
0.03
Quarantine/acclimatization unit—number of gilts per compartment (n)
0.01
0.03
0.71
Pig density in county
Low
High
1.48
0.89
0.10
Number of other pig farms within 1000 m distance
≤ 1
≥ 2
3.94
1.33
< 0.01
2.88
0.92
0.00
< 0.001
2.29
0.81
0.01
< 0.001
Boar semen—purchase from PRRSV unsuspicious boar stud
No
Yes
− 0.83
0.81
0.31
Hygiene lock
No clear separation
Clear separation
0.88
1.21
0.47
Employment of external staff
No
Yes
1.29
0.86
0.13
1.70
0.74
0.02
0.01
1.51
0.65
0.02
0.01
Farrowing rhythm
1- or 2-weekly
3-, 4- or 5-weekly
− 0.90
0.85
0.29
− 1.06
0.66
0.11
0.10
Suckling pigs—age at ear tagging (day)
1st
≥ 2nd
− 0.96
0.86
0.26
Suckling pigs—2nd standard antibiotic treatment
No
Yes
− 0.42
0.82
0.61
Sows—vaccination against PRRSV
No
Yes
− 0.09
1.32
0.94
AIC
94.9
81.8
84.0
BHZP “Bundes Hybrid Zucht Programm”, German commercial provider of hybrid sows, PIC “Pig Improvement Company”, North American commercial provider of hybrid sows
