Holroyd R G, Smith P C
Aust Vet J. 1976 Jun;52(6):258-60. doi: 10.1111/j.1751-0813.1976.tb00101.x.
In a northern Queensland beef herd where there was serological evidence of L. hardjo infection, lactation failure or wastage between pregnancy diagnosis and branding was 11.9% in animals vaccinated with a single dose of a L. hardjo vaccine and 19.4% in unvaccinated controls. This difference was statistically significant (P less than 0.05). Vaccination caused a significant (P less than 0.05) reduction in rate of lactation failure in heifers but not in other classes of cows.
在昆士兰北部一个有牛硬蜱感染血清学证据的肉牛群中，在怀孕诊断到打烙印期间，单剂量接种牛硬蜱疫苗的动物泌乳失败或流产率为11.9%，未接种疫苗的对照组为19.4%。这种差异具有统计学意义（P小于0.05）。接种疫苗使小母牛的泌乳失败率显著降低（P小于0.05），但对其他类别的母牛没有影响。
