Association between average daily gain, faecal dry matter content and concentration of Lawsonia intracellularis in faeces

Pedersen, Ken Steen; Skrubel, Rikke; Stege, Helle; Angen, Øystein; Ståhl, Marie; Hjulsager, Charlotte; Larsen, Lars Erik; Nielsen, Jens Peter

doi:10.1186/1751-0147-54-58

Acta Veterinaria Scandinavica

Table 2 Modelled association between daily gain, faecal dry matter, Lawsonia intracellularis and porcine circovirus ^a

From: Association between average daily gain, faecal dry matter content and concentration of Lawsonia intracellularis in faeces

Variable		Coeficient^b	Standard	P-value^c
			error
Outcome	Average daily gain for day 1–7 prior to collection of the examined faecal sample (kg/day)
Independent	0 = L. intracellularis qPCR negative	0^a
Categorical	1 = L. intracellularis numbers between limit of dection and lower limit of dynamic range	0.18^a	0.159
	2 = L. intracellularis numbers within dynamic range	0.702^b	0.279
	3 = L. intracellularis numbers above dynamic range	−0.527^c	0.177	<0.0001
	0 = PCV2 qPCR negative	0
	1 = PCV2 copy numbers below dynamic range	0.019	0.048
	2 = PCV2 copy numbers within dynamic range	−0.009	0.032	0.86
	Gender (barrow/female)	0.025	0.024	0.30
Continuous	L. intracellularis bacteria numbers within dynamic range (log₁₀ bacteria/g faeces)	−0.144	0.040	<0.0001
	PCV2 copy numbers within dynamic range (log₁₀ copies/g faeces)	0.018	0.026	0.50
	Faecal dry matter content (%)	0.010	0.006	0.099
	Observation day (1–19)	0.021	0.002	<0.0001
	Start-weight (kg)	0.034	0.005	<0.0001
Interaction	0 = L. intracellularis qPCR negative * faecal dry matter content	0^a
	1 = L. intracellularis numbers between limit of dection and lower limit of dynamic range * faecal dry matter content	−0.008^ab	0.007
	2 = L. intracellularis numbers within dynamic range * faecal dry matter content	−0.028^b	0.013
	3 = L. intracellularis numbers above dynamic range * faecal dry matter content	0.018^c	0.008	0.0002
	L. intracellularis bacteria numbers within dynamic range (log₁₀ bacteria/g faeces) * faecal dry matter content	0.006	0.002	0.003
Intercept		−0.36	0.15
Random^d	Pen	0.013
	Pig	0.00004

^aFor non-significant variables the p-values and coefficients at the time of removal from the model is displayed.
^bCoefficients with different superscripts within the same variable are significantly different (p < 0.05); ^cP-values for overall effect of variable; ^dRandom effect coefficients displayed as variance.

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ISSN: 1751-0147

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