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Korean J. Vet. Serv. 2017; 40(3): 201-208
Published online September 30, 2017
https://doi.org/10.7853/kjvs.2017.40.3.201
© The Korean Socitety of Veterinary Service
한우에서 BVDV 지속감염우의 정액 성상에 관한 연구
김찬란;김민수;김남태;전익수;김성우;
농촌진흥청 국립축산과학원 가축유전자원센터;농촌진흥청 국립축산과학원 가축유전자원센터;농촌진흥청 국립축산과학원 가축유전자원센터;농촌진흥청 국립축산과학원 가축유전자원센터;농촌진흥청 국립축산과학원 가축유전자원센터;
Semen Properties of a Hanwoo bull persistently infected by BVDV
Correspondence to : 농촌진흥청 국립축산과학원 가축유전자원센터(Animal Genetic Resources Research Center, National Institute of Animal Science, RDA)
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.
Keywords Persistent infection,BVDV,Hanwoo bull,Semen,
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Research Article
Korean J. Vet. Serv. 2017; 40(3): 201-208
Published online September 30, 2017 https://doi.org/10.7853/kjvs.2017.40.3.201
Copyright © The Korean Socitety of Veterinary Service.
한우에서 BVDV 지속감염우의 정액 성상에 관한 연구
김찬란;김민수;김남태;전익수;김성우;
농촌진흥청 국립축산과학원 가축유전자원센터;농촌진흥청 국립축산과학원 가축유전자원센터;농촌진흥청 국립축산과학원 가축유전자원센터;농촌진흥청 국립축산과학원 가축유전자원센터;농촌진흥청 국립축산과학원 가축유전자원센터;
Semen Properties of a Hanwoo bull persistently infected by BVDV
Kim, Chan-Lan;Kim, Min Su;Kim, Namtea;Jeon, Ik Soo;Kim, Sung Woo;
Animal Genetic Resources Research Center, National Institute of Animal Science, RDA;Animal Genetic Resources Research Center, National Institute of Animal Science, RDA;Animal Genetic Resources Research Center, National Institute of Animal Science, RDA;Animal Genetic Resources Research Center, National Institute of Animal Science, RDA;Animal Genetic Resources Research Center, National Institute of Animal Science, RDA;
Correspondence to:농촌진흥청 국립축산과학원 가축유전자원센터(Animal Genetic Resources Research Center, National Institute of Animal Science, RDA)
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.
Keywords: Persistent infection,BVDV,Hanwoo bull,Semen,
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