Bacterial contamination of uterus and its effect on the refertilization in dairy cows
1989
Takacs, T. | Gathy, I. | Ramocsa, M. | Magyari, L. | Turi, Gy. (Debreceni Allattenyeszto Vallalat, Debrecen (Hungary)) | Bajmoczy, E. (Debreceni Allategeszsegugyi Intezet, Debrecen (Hungary))
Bacteriological investigation of uterus was carried out on 14 dairy farms, in case of 150 dairy cows during the involution, first between the 10th and 20th days postpartum and then twice with two weeks intervals. Grade of bacteria contamination was determined at different points of time and in vitro resistance of isolated bacteria was studied. Correlation between reproductive biological indices of investigated animals and bacterial contamination of uterus, as well as certain environmental and genetic factors were analysed. At the end of the involution, uterus showed a moderate or more severe contamination in 35.7 per cent of investigated animals. Streptococci, E. coli and corynebacteria were isolated in the majority of cases. The isolates showed an expressed antibiotic resistance. Both the farms and different groups showed significant differences in the length of time from calving to the first service, as well as to the fertilization. A close correlation was found between these differences and the bacterial contamination of uterus at the end of inovulation. The worst reproductive parameters were found in the case of uterinal contamination due to corynebacteria. The rate of infected uteri was higher than the average after the third calving, as well as in individuals with a lactation peak lower than 20 l. No correlation was found between the bacterial state of uterus and breed, keeping conditions, season of calving (autumnal as well as winter-early vernal). Periodic investigations of a representative part of stocks indicate the grade of contamination and progress of clear-up of uterus on the dairies and give information on the appropriate prevention and make possible the special purpose antibacterial therapy of meritis.
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