Survey of beef bulls in Brazil to assess their role as source of infectious agents related to cow infertility
| Autor: | Maria E. R. J. da Silva, Franciele Maboni Siqueira, Gabriela Merker Breyer, Silvia De Carli, Maria Elice Rosa Dias |
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| Rok vydání: | 2021 |
| Předmět: |
Male
Mycoplasma bovis Infertility Veterinary medicine animal diseases Cattle Diseases Tritrichomonas foetus Beef cattle Ureaplasma diversum Pregnancy medicine Animals Full Scientific Reports reproductive and urinary physiology Subclinical infection General Veterinary biology medicine.disease biology.organism_classification Herd Cattle Female Campylobacter fetus Mycoplasma bovigenitalium Brazil |
| Zdroj: | J Vet Diagn Invest |
| ISSN: | 1943-4936 1040-6387 |
| DOI: | 10.1177/10406387211050636 |
| Popis: | Poor reproductive performance in beef cattle caused by infectious agents results in major financial losses as a result of reduced pregnancy rates and extended calving intervals. Bulls can be subclinical chronic carriers of bacterial and protozoal agents involved in cow infertility, such as Campylobacter fetus subsp. venerealis, Ureaplasma diversum, Mycoplasma bovigenitalium, Mycoplasma bovis, and Tritrichomonas foetus. Bulls harbor these microorganisms in their preputial crypts and transmit the agents to cows during natural mating. To obtain an overview of the etiologic agents in the preputial mucus of bulls, we aimed to identify, by PCR assay, C. fetus subsp. venerealis, M. bovis, U. diversum, M. bovigenitalium, and T. foetus in Brazilian bulls from farms with high infertility rates. We collected preputial mucus from 210 bulls on 18 beef cattle farms in Brazil between 2019 and 2020. We found at least one of the infectious agents that we were studying in bulls on 16 of the 18 beef cattle farms tested. We detected at least one infectious agent from 159 of 210 (76%) bulls tested, namely C. fetus subsp. venerealis, M. bovis, U. diversum, M. bovigenitalium, and T. foetus in 87 (55%), 84 (53%), 45 (28%), 28 (18%), and 1 (0.6%) animal, respectively. We found 95 bulls (60%) positive for only 1 etiologic agent (single infection) and 64 bulls (40%) carried multiple agents. Our results demonstrate the occurrence of bacterial and protozoal infectious agents that may be related to infertility in Brazilian beef cattle herds. |
| Databáze: | OpenAIRE |
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