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Oestrus detection: "Flehman lip curl"
Royal Veterinary College
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Oestrus detection: cow with unruffled hair
Royal Veterinary College
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Oestrus detection: tail paste rubbed off
Royal Veterinary College- Pictures
A woman "in heat", standing in a field with her breasts exposed and holding a basket of flowers, accompanied by three cupids. Lithograph by J. Laurens, ca. 1857, after N. Diaz de la Peña.
Diaz de la Peña, Narcisse Virgile, 1807-1876.Date: [between 1850 and 1859]Reference: 31166i
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Blood from vagina of a cow in oestrus
Royal Veterinary College