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Selective dry cow therapy (SDCT), the identification and treatment of only cows or quarters that have or are at risk for an infection over the dry period, constitutes a prudent strategy when considering antibiotic use. Milk culture by a professional lab, which takes ≥ 1 day and may not be accessible to all dairies, is currently recognized as the gold standard for determining intramammary infections (IMI). Identification of cows or quarters for SDCT requires timely and cost-beneficial diagnostics with acceptable sensitivities (Se) and specificities (Sp) to decrease under, as well as overtreatment of animals at dry-off (DO). For this purpose, our objectives were to explore the test characteristics of the California Mastitis Test (CMT), use of the last-test DHIA somatic cell count (LTSCC), and use of an automated algorithm (ALG) based on sequential somatic cell count (SCC) and mastitis events to identify IMI in quarters and cows at DO using 2 categories of IMI (all or only major pathogens)., American Association of Bovine Practitioners Proceedings of the Annual Conference, 2019

The objectives of this study was to a) evaluate the association between subclinical ketosis (SCK) and the subsequent incidence of various clinical diseases; b) evaluate the association between various clinical diseases and the subsequent incidence of SCK; and c) evaluate the association between SCK and milk yield (MILK), fat content (FAT), protein content (PROT), fat:protein ratio (FPR), linear somatic cell count (LSCC) at first test, conception at first breeding (CFB), and culling before 60 DIM (CULL60)., American Association of Bovine Practitioners Proceedings of the Annual Conference, 2012

Heat stress influences production and health in dairy herds. The effectiveness of different cooling strategies could potentially be assessed by the degree of seasonal variability on production and health within a herd. The first step to develop an assessment tool is to understand the regional seasonal variation in production and health. The aim of this study was to evaluate the seasonal variation on milk production, peak milk, and early culling in California Holstein herds., American Association of Bovine Practitioners Proceedings of the Annual Conference, 2012