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Poster communications

Cows selected for resistance to mastitis show contrasted immune responses compared to mastitis susceptible cows

Abstract : Mastitis remains an important disease in dairy farming nowadays. Genetic selection of animals for increased resistance to mastitis is a relevant strategy to reduce the burden that mastitis entails on dairy cows. A divergent selection scheme based on somatic cell counts and clinical mastitis records was set-up on Prim’Holstein cows at the INRA experimental unit of Le Pin-au-Haras. In order to better define the mechanism underlying genetic resistance to mastitis, inflammatory challenges as well as immunization with a model antigen were performed on cows from these two different lines. LPS was infused in one healthy udder quarter of each cow approx. 1 month post-partum. Milk was collected 4, 8, 12 and 24h post-infusion. Somatic cells recruited in milk were counted and the cytokines/chemokines CXCL8, IL-6 and IL-1β were measured by ELISA. For adaptive response studies, cows were immunized 15 days before dry-off with ovalbumin and the response was evaluated 15 days after dry-off. Response to immunization was evaluated by measuring IFNγ and IL-17A and upon antigen stimulation in whole blood assays. Although LPS triggered mastitis in all infused quarters, mastitis resistant cows (n= 16) showed decreased inflammatory response compared to more susceptible cows (n= 25) at t=8h post-infusion. No differences were observed between the two groups in terms of response to immunization. Altogether, these results suggest that, in response to intra-mammary LPS challenge, cows selected for resistance to mastitis are better able to control the inflammatory response.
Keywords : bovin
Document type :
Poster communications
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https://hal.inrae.fr/hal-02737795
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Submitted on : Tuesday, June 2, 2020 - 7:51:52 PM
Last modification on : Friday, January 14, 2022 - 12:08:01 PM
Long-term archiving on: : Friday, December 4, 2020 - 5:51:29 PM

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  • HAL Id : hal-02737795, version 1
  • PRODINRA : 483108

Citation

Pierre Germon, Sarah Barbey, Rachel Lefebvre, Didier Boichard, Gilles Foucras, et al.. Cows selected for resistance to mastitis show contrasted immune responses compared to mastitis susceptible cows. 12. International Veterinary Immunology Symposium, Aug 2019, Seattle, United States. 176 p., 2019. ⟨hal-02737795⟩

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