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Conséquences des mammites cliniques sur la production laitière, la conductivité électrique du lait et la morphologie des trayons et de la glande mammaire de la vache Holstein

Abstract : Clinical mastitis is a germ-related teat and udder infection prevalent in dairy cows. The severity of the disease depends on the involved bacteria and the host reaction. Milk production but also teat and udder morphology can be irreversibly impacted. Our first goal was to study the incidence of clinical mastitis on milk production parameters in our dairy herd, with a special emphasis on the measure of electrical conductivity of individual udder quartiers. Our second goal was to use ultrasonography to illustrate changes caused by clinical mastitis on udder parenchyma and teats’ cistern, aiming at validating new indicators. Our results show a significant reduction of milk yield during and after a clinical mastitis episode, the loss of milk production reaching up to 80% in the most severe cases. Moreover, changes in milk composition during mastitis induce a significant increase in milk mean conductivity in the 4 days surrounding the first clinical signs and dramatic fluctuations of this parameter over at least a 28-day period surrounding detection of the pathology. Ultrasonography of udders and teats affected by mastitis reveals distention of the udder parenchyma and reduction of teat cistern volume during inflammation. This work shows that sonographic examination of bovine teats is a useful non-invasive method to be used in mastitis control during and after clinical episodes. Those morphometric indicators could help dairy cattle breeders to decide whether they should cull a cow after clinical mastitis.
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https://hal.inrae.fr/hal-02750053
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Submitted on : Wednesday, June 3, 2020 - 4:33:01 PM
Last modification on : Tuesday, November 23, 2021 - 5:28:02 PM
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  • HAL Id : hal-02750053, version 1
  • PRODINRA : 224634

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Christophe Staub, Jean-Luc Touze, Alain Bouttier, Sandrine Freret, Florence Gilbert, et al.. Conséquences des mammites cliniques sur la production laitière, la conductivité électrique du lait et la morphologie des trayons et de la glande mammaire de la vache Holstein. 20. Rencontres autour des Recherches sur les Ruminants, Institut de l'Elevage (IDELE). Paris, FRA. Institut National de la Recherche Agronomique (INRA)., Dec 2013, Paris, France. ⟨hal-02750053⟩

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