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Twenty four crossbred repeat breeder cows were evaluated for physico-chemical characteristics of estrual cervicovaginal mucus (CVM), serum biochemical parameters and progesterone concentration during estrus. The incidence of endometritis among repeat breeders was found to be 75 percent. The appearance of CVM of all normal (non-endometritic) repeat breeder cows was transparent while 22.22, 50.00 and 27.78 percent endometritic cows had transparent, translucent and cloudy CVM, respectively. The mean pH of CVM of endometritic cows was higher than their normal counterparts. The endometritic cows had significantly lower mean serum phosphorus level (6.46±0.39 vs. 8.18±0.63 mg/dl) and nonsignificantly lower serum total protein, globulin, A/G ratio, calcium and cholesterol levels than normal repeat breeders. The serum AST, ALT and progesterone during estrus were non-significantly higher in endometritic vs. normal repeat breeders. One third (33.33%) repeat breeders had suprabasal progesterone levels (>0.5 ng/ml) during estrus. [ABSTRACT FROM AUTHOR]