Adverse effects of Influenza A(H1N1)pdm09 virus infection on growth performance of Norwegian pigs - a longitudinal study at a boar testing station

Table 4 Multilevel regression of feed conversion efficiency in pigs infected with influenza A(H1N1)pdm09 virus

Feed Conversion Efficiency (FCE)
Predictors	Coefficients	SE	P values	95% CI
Breed
Landrace	Reference
Duroc	0.042	0.010	<0.001	0.023	0.062
Growth phase
GF1(33_60 kg)	Reference
GF2(61_80 kg)	0.287	0.011	<0.001	0.264	0.309
GF3(81_100 kg)	0.544	0.014	<0.001	0.517	0.571
Birthdate	-0.0002	0.00001	<0.001	0.000	0.000
Average daily feed intake	0.024	0.010	0.02	0.004	0.044
Interaction term: INFGP
SERONEG*GF(1-3)	Reference
SEROPOS*GF1	-0.015	0.011	0.1570	-0.037	0.006
SEROPOS*GF2	0.002	0.010	0.8560	-0.018	0.022
SEROPOS*GF3	0.029	0.010	0.0040	0.009	0.049
VIR1a*GF1	-0.008	0.025	0.7510	-0.057	0.041
VIR1a*GF2	0.050	0.022	0.0230	0.007	0.093
VIR1a*GF3	0.114	0.022	0.0000	0.071	0.157
VIR1b*GF1	0.026	0.049	0.5930	-0.070	0.122
VIR1b*GF2	0.092	0.044	0.0390	0.005	0.178
VIR1b*GF3	0.176	0.045	0.0000	0.087	0.265
VIR2*GF1	-0.049	0.037	0.1870	-0.122	0.024
VIR2*GF2	0.121	0.036	0.0010	0.051	0.192
VIR2*GF3	0.033	0.036	0.3640	-0.038	0.103
VIR3*GF1	-0.016	0.037	0.6560	-0.089	0.056
VIR3*GF2	0.045	0.035	0.1970	-0.023	0.112
VIR3*GF3	0.091	0.035	0.0090	0.023	0.159
Constant (β ₀ )	4.658	0.193	<0.001	4.279	5.037

Abbreviations: SERONEG Seronegative pigs, SEROPOS Seropositive pigs (not tested for virus), VIR1a pigs viral positive between bodyweight 33 kg and 50 kg, VIR1b pigs viral positive between bodyweight 51 kg and 60 kg, VIR2 pigs viral positive between bodyweight 61 kg and 80 kg, VIR3 pigs viral positive between bodyweight 81 kg and 100 kg. The model is hierarchical with three levels; observations (n = 5865); pig (n = 1955) and herd (n = 43). *denotes interaction term.

ISSN: 1746-6148