Korean Journal of Veterinary Service (한국동물위생학회지)

The Korean Society of Veterinary Service (한국동물위생학회)
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Semen Properties of a Hanwoo bull persistently infected by BVDV

한우에서 BVDV 지속감염우의 정액 성상에 관한 연구

  • Kim, Chan-Lan (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA) ;
  • Kim, Min Su (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA) ;
  • Kim, Namtea (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA) ;
  • Jeon, Ik Soo (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA) ;
  • Kim, Sung Woo (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA)
  • 김찬란 (농촌진흥청 국립축산과학원 가축유전자원센터) ;
  • 김민수 (농촌진흥청 국립축산과학원 가축유전자원센터) ;
  • 김남태 (농촌진흥청 국립축산과학원 가축유전자원센터) ;
  • 전익수 (농촌진흥청 국립축산과학원 가축유전자원센터) ;
  • 김성우 (농촌진흥청 국립축산과학원 가축유전자원센터)
  • Received : 2017.08.26
  • Accepted : 2017.09.28
  • Published : 2017.09.30
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Abstract

BVDV causes significant infections in ruminants, resulting in reproductive disorders, diarrhea, reduced milk production and enormous damage to farms. In particular, identification and culling of persistent infectious calf is an important task to eliminate infectious nidus in cattle households. However, studies on physiological characteristics of PI bull are still insufficient to understand reproductive effects of BVDV. In this study, one PI bull was confirmed in herd and complete blood analysis was performed. The lymphocyte count of PI at age 4 was below the normal range and the number of WBCs was also in the lower level of normal range in blood. The sperm number produced by PI male becomes lower and the viability of fresh sperm comes to poor with ages (P<0.05). The sperm abnormality was also increased, especially in nuclear vacuoles of head and droplets of midpeace (P<0.05). The PI male becomes infertile due to poor semen quality at age 4. With these results, we concluded that BVDV in PI bull cause decreased sperm cell and abnormality in semen so causes infertility. However, it appears that BVDV could not be transmitted by indirect contact of PI bull, because there was no evidence of BVDV infection in the herd, when regular vaccination program was applied.

소에 있어서 BVDV는 반추류에서 중대한 감염을 야기하여 번식장애, 설사 및 유량감소를 야기하여 농가에 막대한 피해를 야기하고 있다. 특히 지속감염우의 확인과 도태는 농가 내 감염원을 제거하는 중요한 일이나 아직까지 PI개체의 바이러스의 감염과 전파에 관한 연구는 미진한 것으로 추정된다. 본 연구에서는 도입된 수컷에서 PI를 확인하였으며 전혈 검사를 실시 하면, PI 혈액 성상에서 림프구가 낮게 관찰되며 전체 WBC의 수는 정상범위에 속하나 낮게 나타나는 것을 알 수 있었다. PI 수컷에서 생산된 정액은 정자 수가 매우 낮으며, 신선 정액의 생존성도 불량한 것으로 조사되었다. 정자 기형율 또한 증가되었으며 특히 공포와 중편부의 소적을 가진 기형정자의 비율이 높았다. PI수컷은 나이가 들수록 정액 성상이 불량하여 불임화되었고 이는 BVDV가 정소의 정자 생산능력을 낮추어 사출된 정액내 정자수 감소 현상을 야기한다는 것을 알 수 있었다. 그럼에도 불구하고 확인된 PI 개체에 의한 전체군의 감염 현상은 관찰할 수 없었는데, 이는 적절한 백신 프로그램에 의하여 PI에 의한 간접적인 전파의 위험성이 낮다고 판단된다.

Keywords

References

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