Evaluation of false ultrasonographic pregnancy diagnoses in sows by measuring the concentration of unconjugated estrogens in feces

Author： Szenci O. Palme R. Taverne M.A.M. Varga J. Meersma N. Wissink E.

Publisher： Elsevier

ISSN： 0093-691X

Source： Theriogenology, Vol.48, Iss.5, 1997-10, pp. : 873-882

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