A nutritional risk factor for early metritis in dairy farms in France

摘要: Abstract A survey was conducted in dairy herds France (79 were surveyed during 2–4 years six regions). Two groups of herd-years (free brucellosis) constructed according to their early metritis cumulative incidence (EMEI) order detect nutritional risk factors for the disease. The first group included 10% with highest EMEI (EME + group; n =24); second − group) 24 lowest and same number each region annual period. Herd-years both high low EMEI/retained placenta ratios removed from study rule out which EME mainly connected retained placenta. herd data concerned four other clinical disease incidences, Q-fever serology, size, breed, housing system, use a calving pen, milk yield composition, number, season calving, duration dry period, feeding days 14 major feedstuffs given cows period presence diet vitamins A, D E. Data analysed using barycentric analysis (a form discriminant analysis) find variables discriminating herd-years. characterised by longer durations urea more winter calvings. These two explained 26.9% total variation analysis. None remaining 26 than variation. Dietary might involve environmental changes uterus subsequent easier bacterial growth lowered local immune defence. Winter calvings be associated poor hygienic conditions would favour uterine infections postpartum