ABSTRACT
The study aimed to through a light on the bacteria of the servico-vaginal mucous from retained foetal membrane cases, measurement of some blood constituents and hormones and its relationship to reproductive performance in parturited cows in modern farm near Tanta. 10 retained placental cases and other 10 cases with normal dropped placenta [control]. The bacteriological investigation of uterine swabs in control group revealed that [21.9%] were positive, yielded 49 bacterial isolates. The most higher percent was E. coli [32.65%] and followed by Staphylococcus aureus [20.40%], from obligate anaerobic pathogens, Bacteriodes spps [4.08%] and Fusobacterium necrophorum [2.04%].In retained placenta cases there were [68.8%] positive swabs yielded 169 isolates. The higher percent was E.coli [18.39%], followed by Staphylocacus aureus [14.69%], Corynebacterum pyogens [11.25%], Proteus spps [8.87%], and Enterococcus faecalis [7.69%]. From obligate anaerobic pathogens, there were Bacteriodes spps [4.78%], Fusobacterum necrophorum [3.55%] and Clostridium perfringens [2.95%]. Although it was evidence that Escherichia. coli, Staphylococcus aureus and Corynebacterium pyogens shared in most mixed infected cultures. Yet most isolates were very sensitive to Ceftiofur, Enrofloxacin and moderately sensitive to Oxyteteracyllin and ampicillin and weakly sensitive to Amoxycillin and Pencillin. The blood analysis showed significant lower level of calcium, phosphorous, magnesium and oesteradiol- 17 B and higher level of progesterone than normal dropped placental cows. Subsequently reproductive performance was affected as it had long time of uterine involution, appearance of 1[st] post partium heat, calving interval as well as high number of services per conception as compared with normal ones