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American Journal of Veterinary Research|March 1, 1990
Excretion of porcine parvovirus through the genital tract of boarsC Gradil, T Molitor, M Harding, et al.
Journal of the American Veterinary Medical Association|January 15, 1980
Seasonal influence on estrous activity in sows and giltsJ P Hurtgen, A D Leman, B Crabo
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