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Textbook
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D. E. Noakes, T. J. Parkinson and G. C. W. England, 2008. Arthur''s Veterinary Reproduction and Obstetrics
England G., 2005. Fertility and Obstetrics in the Horse.
Youngquist RS. 1997. Current Therapy in Large Animal Theriogenology. W.B. Saunders Co, Philadelphia, Pennsylvania.
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