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Thirty postpartum (>70 days) anestrus crossbred cows were treated with three standard hormonal protocols (CIDR TRIU-B, and P4 Sponge n=10 each) for induction of estrus and the findings were compared with a group of untreated anestrus cows (Blank Sponge n=10). 80 vaginal swabs were collected aseptically from each group just before insertion of Implants/Blank Sponge and at the time of Implant/Blank Sponge withdrawal for microbiological evaluation of vaginal mucosa. Total number of isolates obtained from all the swabs were 180. Out of 180 isolates, 72 (40.00%) isolates were Gram positive and 108 isolates were (60.00%) Gram-negative bacteria, indicating dominance of Gram- negative bacteria. Overall ratio of number of isolates per vaginal sample obtained in the present study was 2.25. The highest rate of isolation of bacteria per sample was recorded in the placebo group at the time of removal of placebo i.e. 2.6, followed by 2.5 by same group at the time of insertion, 2.3 at the time of TRIU-B removal, 2.2 at the time of TRIU-B insertion and P4 Sponge removal, 2.1 in CIDR at the time of removal and P4 Sponge insertion and lowest i.e. 2.0 in CIDR group at the time of insertion of implant. The frequency of single and mixed isolates observed in different groups of anestrus animals at the time of insertion and removal of implants showed predominance of mixed isolates over single isolates 63 (78.75%) vs 17 (21.25%), indicating dominance of mixed isolates over single isolates. E. coli, Staphylococcus, Proteus and Bacillus were the commonest isolates obtained before and after insertion of implants and Blank Sponge in post-partum anestrus cattle. The implant used and time/period of isolation did not alter the types of bacteria isolated.

Evaluation of the bacteriological flora in the vagina of postpartum anestrus cattle before and after treatment with three progesterone implants