Genetic analysis of reproductive performance in sows during porcine reproductive and respiratory syndrome (PRRS) and porcine epidemic diarrhea (PED) outbreaks

Table 7 Variance components^ab for the Clean, PRRS, and PED statuses^c

Trait^d	Clean		PRRS		PED
	\( {\sigma}_u^2 \)	\( {\sigma}_e^2 \)	\( {\sigma}_u^2 \)	\( {\sigma}_e^2 \)	\( {\sigma}_u^2 \)	\( {\sigma}_e^2 \)
AB	0.17	3.29	5.34	3.29	14.88	3.29
TB	1.13	8.30	2.09	10.78	2.65	7.56
NBA	0.88	8.28	1.87	11.56	0.75	8.96
SB	0.02	0.24	0.06	0.32	0.015	0.25
MUM	0.001	0.15	> 0.001	0.37	> 0.001	0.19
NBD	0.02	0.32	0.10	0.46	0.005	0.37
PROP	> 0.001	0.01	0.003	0.03	> 0.001	0.03
NW	0.17	6.87	1.29	10.01	1.78	10.14

^aEstimates of additive genetic (\( {\sigma}_u^2 \)) and residual (\( {\sigma}_e^2 \)) variances;
^bVariances expressed as %² on the logistic scale for AB, and as piglets² for all other traits
^cClean, no disease actively present, PRRS, porcine reproductive and respiratory syndrome, PED, porcine epidemic diarrhea
^dAB, Abortion; TB, Total number of piglets born; NBA, Number of piglets born alive; SB, Number of stillborn piglets; MUM, Number of mummified piglets; NBD, Number of piglets born dead; PROP, Proportion of piglets born dead; NW, Number of piglets weaned

ISSN: 2049-1891