Risk factors for clinical mastitis, ketosis, and pneumonia in dairy cattle on organic and small conventional farms in the United States.

摘要: The US regulations for production of organic milk include a strict prohibition against the use antimicrobials and other synthetic substances. effect these on dairy animal health has not been previously reported. objective this study was to characterize disease detection identify risk factors selected diseases (ORG) similarly sized conventional (CON) farms. Dairy herds (n=292) were enrolled across 3 states (New York, Oregon, Wisconsin) with CON matched ORG based location herd size. During single visit, information collected about management practices occurring in previous 60 d, paperwork left recording occurrences during d after visit. For analysis, further divided into grazing nongrazing. Poisson regression models used assess rate farmer-identified recorded cases clinical mastitis, ketosis, pneumonia. An increased mastitis associated management, forestripping, presence contagious pathogens bulk tank culture, proactive postpartum cows, stall barn housing. ketosis having more sensitive definition using housing, feeding greater amount concentrates. pneumonia lack grazing, small or medium size, Jersey as predominant breed. Overall, definitions perceptions similar among systems disease.