It was found that the impact of PEDV infection on the reproductive performance of gilts and sows depended on the period of pregnancy when the females were exposed to the pathogen, and parity number. The pregnant females infected with PEDV during the first 30 days of pregnancy had a 12.6 percentage point decrease of FR (91.1% vs. 78.5%, P = 0.003), a 5.7 percentage point increase of RR (3.5% vs. 9.2%, P = 0.01), a 1.3 percentage point increase of AR (2.1% vs. 3.4%, P = 0.01) and a 2.0 percentage point increase of MM (3.5% vs. 5.6%, P < 0.001). SB increased in the pregnant females that were infected with PEDV during 91–120 days of pregnancy (1.8 percentage points, 4.5% vs. 6.2%, P = 0.01). The impacts of PEDV infection on subsequent reproductive performance were more severe in the pregnant gilts than the pregnant sows. PEDV infection during the first 30 days of pregnancy resulted in a decrease of TB by 1.4 (11.7 vs. 10.3 piglets/litter, P < 0.001) and a decrease of BA by 2.2 (10.7 vs. 8.5 piglets/litter, P < 0.001) in the gilts’ litters, while the influence of PEDV infection on TB and BA was not significant in sows (P > 0.05).
It was concluded that natural infection of PEDV in the pregnant gilts and sows caused a reduction of subsequent reproductive performance.
m-on Olanratmanee, Annop Kunavongkrit and Padet Tummaruk. Impact of porcine epidemic diarrhea virus infection at different periods of pregnancy on subsequent reproductive performance in gilts and sows. Animal Reproduction Science. 2010. Vol. 122 (1-2): 42-51.