Aerobic Bacteria Associated With Repeat Breeding In Cross-Bred Cattle In Khartoum State

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Muna Mohamed El Hassain Ibrahim El Gadi, El Gadi
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University of Khartoum
A total of 99 cervical swabs were collected from 15 post-parturient cross-bred cows; 18 cervical from nine cross-bred repeat breeder cows (control group) and 36 cervical swabs from nine cross-bred repeat breeders (synchronized group). These swabs were collected from cross-bred cows at the University of Khartoum Farm at Shambat. The isolates that were recovered from these three groups were 165 constituting from 16 different bacterial species only. They included Aerococcus viridans, Bacillus coagulans, B. firmus, B. laterosporus, Bacillus sp., Corynebacterium renale, Lactobacillus brevis, Micrococcus luteus, Micrococcus roseus, Micrococcus viridans, Staphylococcus auerus, Staph. epidermidis, Streptococcus bovis, Strep. faecalis, E. coli and Pseudomonus aerguinosa. It was noticed in the post-parturient group that the bacteria Corynebacterium renale, E. coli, Pseudomonas aerguinosa and Staph. aureus recovered for 30 days or more post-partum contributed in decreasing conception rate and increasing days open. Days open in those cows from which the latter bacteria were recovered ranged from 180 days up to seven months compared to an average of 84 days in the remaining cows which conceived again after the acceptable time for normal healthy cows. In the repeat breeder, the control group and the synchronized group, there was no difference between the two groups in the conception rate. Thus, the organisms isolated from both groups were not the reason for these cows to be repeat breeders because when these cows were inseminated after natural or synchronized heat, conception occurred. In spite of this observation, E. coli was the organism isolated during heat from the two cows in the control group which failed to conceive even after three inseminations. In these two latter cows age factor could have contributed in being repeat breeders. Forty two cervical swabs, 30 vaginal swabs, 33 vaginal mucous samples were collected from cross-bred repeat breeder cows from different farms at different localities. These specimens together with ten preputial washings and ten semen specimens were grown in PPLO-serum media and TEM media. Five mycoplasma isolates were recovered from semen specimens, two from cervical swabs and one vaginal mucous sample showed organisms identified as Mycoplasma bovigenitatium. The remaining isolates from the three semen specimens, one cervical swab and two vaginal mucus specimens were identified as Acholeplasma. Gram swabs and seven vaginal mucus. These organisms were identified as Campylobacter cryaerophilia, Campylobacter sputorum faecalis and Campylobacter cryaerophilia, Campylobacter sputorum faecalis and Campylobacter lari. It was concluded that non-specific bacteria; Corynebacterium renale, E. coli, Pseudomonas aerguinosa and Staph. aureus decreased conception rate and increased days open for the post-parturient cows. Although these organisms were also isolated from the repeat breeder group but it was obvious that they did not play a significant role in causing the syndrome. Mycoplasma and Campylobacter organisms were reported to be specific causes of infertility by many authors but were also isolated from normal breeders by other authors. Malpractices in management and nutrition would certainly lead or assist in the infection of the genital tract with bacteria. Dairy farms system adopted in our country is poor in both management and feeding practices. Cattle reared in these farms are mostly of the cross-bred types which require special management, particularly in our tropical environment to attain maximum performance.
Aerobic ;Bacteria; Associated ; Breeding;Cross-Bred ;Cattle; Khartoum State