Читать книгу Bovine Reproduction - Группа авторов - Страница 181

Bovine venereal campylobacteriosis caused by Campylobacter fetus subsp. venerealis results in transient infertility in cattle and occasional abortion. The bull serves as an asymptomatic carrier transmitting the organism to cows during coitus. Vaccination of bulls with an oil‐adjuvanted killed bacterin can be both protective and curative [12–14]. Exposure of 4‐ and 5‐year‐old vaccinated bulls to C. fetus‐infected heifers resulted in transmission to only 1 of 17 unvaccinated naive heifers and carrier status was not established in any of the five bulls exposed [12]. Therapeutic vaccination of experimentally infected 5‐year‐old bulls with a two‐dose series of an oil adjuvanted killed bacterin was curative in 8 of 10 bulls [13]. While prophylactic vaccination will not clear infection in all bulls, it is an important and inexpensive method of control. The efficacy of vaccines containing an aluminum hydroxide adjuvant is questionable [14, 15]. All bulls should be vaccinated and boostered according to the vaccine label and annual revaccination is recommended.