|
KMID : 1023520170400030201
|
|
Korean Journal of Veterinary Service
2017 Volume.40 No. 3 p.201 ~ p.208
|
|
|
Semen Properties of a Hanwoo bull persistently infected by BVDV
|
|
Kim Chan-Lan
Kim Min-Su
Kim Nam-Tae
Jeon Ik-Soo
Kim Sung-Woo
|
|
|
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.
|
|
|
KEYWORD
|
|
|
Persistent infection, BVDV, Hanwoo bull, Semen
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|