Repeat breeder cow syndrome (RBC) is a major cause of reduced fertility in dairy cows. Authors describe signs, bacteriology and blood biochemistry in 60 Fresian cows with RBC. Results were compared with 80 normal controls. The animals were swabbed forbacteriology and blood taken for hematology and biochemical values. We found higher incidence (P < 0.05) during summer months (45%). Vaginal epithelium was hypertrophied with mucous or purulent secretions in about a third of repeat breeders and mostly with staphylococci (42%) with or without other bacteria. Repeat breeders had higher (P < 0.05) mean blood urea (28.3 mg/L) and cholesterol (289 mmol/L) compared with controls (24.5 mg/L and 174 mmol/L), respectively. Mean glucose (43mg/dl), protein (8.3 g/L), zinc (9.2mmol), Mn (0.554 ug/mL) and Fe (0.419 u.g/mL) were lower compared with controls (51 mg/dL, 10.75 g/L, 14.6u.mol/L, 0.754 u.g/mL and 0.62 u.g/mL), respectively. Results suggest that bacterial infection contributes to repeat breeder syndromewith consequent changes in blood biochemical values.
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