Table 4.

Results from the enterprise budget analyses. Mean values from the stochastic model are shown. Where: H-S are healthy pigs with normal growth; PMWS-D are PMWS pigs that die due to the disease; PMWS-R are PMWS pigs that recover from the disease; Sub-D are PCV2 infected pigs with slow growth, no clear PMWS clinical sign and that die; and Sub-S are PCV2 infected pigs with slow growth, no clear PMWS clinical sign and that survive.

		Value (£)
		H-S	PMWS-D	PMWS-R	Sub-D	Sub-S
Revenue	Total deadweight solda	108.39	0	99.29	0	108.39
	Depreciation of sowb	−3.54	−3.54	−3.54	−3.54	−3.54
Variable costs	Sow feedc	−9.12	−9.12	−9.12	−9.12	−9.12
	Pig feedd	−45.75	−15.28	−49.81	−19.08	−49.05
	Vet&Med coste	−1.87	−6.24	−7.82	−0.87	−2.24
	Transportf	−2.34	0	−2.34	0	−2.34
	Carcass disposal	0	−6	0	−6	0
	Electricityg	−2.12	−0.85	−2.64	−0.98	−2.54
	Waterg	−0.60	−0.24	−0.75	−0.28	−0.72
	Straw & beddingg	−0.43	−0.17	−0.53	−0.20	−0.52
	Levy, insurance, inspectionh	−2.90	0	−2.90	0	−2.90
Gross marginj		39.72	−41.94	19.85	−40.07	35.42
Fixed costs	Labouri	−10.83	−10.83	−10.83	−10.83	−10.83
	Buildingi	−3.47	−3.47	−3.47	−3.47	−3.47
	Equipmenti	−3.51	−3.51	−3.51	−3.51	−3.51
	Other fixed costsi	−2.68	−2.68	−2.68	−2.68	−2.68
Net marginj		19.23	−61.64	−0.65	−60.57	14.92

^aAssuming that the deadweight of a pig is 76% of its live weight (English et al., 1988). The carcass value of a pig was then obtained by multiplying the DAPP to the carcass weight at slaughter. For PMWS-R pigs a penalty cost (PC, see Table 2) was subtracted for each deadweight kg at slaughter.

^bDepreciation of a sow was calculated as: CG/(AP*WSY).

^cSow feed cost was calculated as: (FQ_S*FP_S)/WSY.

^dFeed cost was estimated multiplying the quantity of feed consumed by each type of pig with FP_G.

^eThe cost of Veterinary care and Medical treatment (Vet&Med) was 2.4 pp per kg deadweight (Bench10). Therefore, the cost for a H-S pig was obtained by multiplying this with the total deadweight at slaughter. The Vet&Med cost for PMWS-D was calculated by multiplying the value obtained for an H-S pig by the VMF. The Vet&Med cost for PMWS-R was derived by summing two costs: Vet&Med cost of a PMWS-D pig + the equivalent Vet&Med cost for the time spent in the farm after recovering from disease (extrapolated from the H-S cost). The Vet&Med cost for a Sub-D and a Sub-S pig was obtained by extrapolating the cost obtained for a H-S pig according to their days in feed.

^fObtained from Bench09 for H-S, PMWS-R and Sub-S pigs.

^gReference cost for a H-S pig was obtained from Bench09. Costs for diseased animals were obtained by extrapolating according to their days in feed.

^hReference cost for a H-S pig was obtained from Bench10. Only pigs sent to slaughter are subject to this cost.

ⁱThe cost of labour was £13.9 per kg deadweight (Bench10). This was multiplied by the deadweight of a H-S pig. Building, equipment and other costs were obtained from Bench09. Fix costs were assumed constant for each type of pig.

^jGross and net margin values in this table correspond to the mean values obtained after the stochastic model. Therefore, the values will not correspond to the exact calculations from the above values.