Resumo

PEREZ-MORALES, Rosalva et al. Factors associated with the prevalence of subclinical mastitis in double-purpose cattle. Abanico vet [online]. 2022, vol.12, e2021-41.  Epub 23-Jun-2023. ISSN 2448-6132.  https://doi.org/10.21929/abavet2022.16.

Factors associated with the prevalence of mastitis subclinical in dual-purpose cattle were evaluated in Sonora, Mexico. 350 representative milking cows from the region were sampled. Prevalence of mastitis was determined with the California test and microbiological plate growth. The effects of: season of the year, type of milking, calving number, days in lactation and presence/absence of calf on prevalence of mastitis were evaluated. The Chi2 method and the test of two independent proportions were used to determine statistical differences. The prevalence of subclinical mastitis was similar between seasons (summer 64.9% vs winter 65.7%). The type of milking did not affect the prevalence of mastitis, while the cows with more than 7 calvings showed higher (P≤0.05) prevalence of mastitis 78.2%, compared with the first calving heifers 49.5%, and between 2-6 calvings 67.5% respectively. The days in lactation affected the prevalence of mastitis being higher (P≤0.05) in the cows of ≥141: (74.0%) vs the groups of 7-70 days: (64.2%), 71-140: (58.8%) respectively. The prevalence of mastitis was lower (P≤0.05) in the cows that were milked with the presence of the calf compared to without a calf (63.9% vs 77.9% respectively). The main factors associated with prevalence of mastitis in dual-purpose cattle were determined.

Palavras-chave : bovine mastitis; dual-purpose cattle; risk factors.

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