ThemeTo elucidate the mechanism by which low quality grass silage causes immunity lowering and reproductive disorders in cattle and propose countermeasures
BelongsField Center of Animal Science and Agriculture/StaffResearch Department/Department of Life and Food Sciences/Division of Animal Production/Section of Animal HusbandryVeterinary Medical Center/Diagnostic Resouce
|Field||Preventice veterinary medicine, Dairy production medicine, Animal nutrition|
|Keyword||Metabolic profile test(MPT), Volatile basic nitrogen(VBN), Endotoxin(LPS), Oxydative stress, d-ROMs/BAP, Milk urea nitrogen(MUN), Milk keton body|
It is well known that feeding rotted silage to cows may result in diarrhea, decreased milk quality and reproductive disorders. However, the mechanism is not clear yet.
We observed that milk urea nitrogen (MUN) increased by feeding rotted feed to cows, at the same time, milk yield decreased, and case of mastitis and non-pregnant cattle increased. Therefore, we monitored the volatile basic nitrogen (VBN) of grass silage everyday to investigate the relationship between VBN fluctuation of feed and bovine immune function, and discovered that the phagocytic ability of leukocytes changed after VBN elevation. Furthermore, in connection with ovarian function, we also confirmed that conception rate declines when VBN of feed increases within 2 weeks before insemination. During this research, the silo was flooded due to heavy rain, and after feeding of the washed-silage, the estrus was appeared and the conception rate improved. With this accident as a hint, we are currently conducting research to maintain the health of cattle and to improve reproductive efficiency by washing the rotted silage.
List of current research topics
- Effects of washing of rotted grass silage feeding on ovarianfunction in dairy cows.
- Effects of supplementation of some anti-oxydatives on duration of clinical mastitis in dairy cows.
As a dairy cattle veterinarian, my interests are disease prevention and economic improvement of the dairy farmer, by improvement of feeding and management, keeping cattle health with no pharmaceuticals use.
|Room address||Field center of Animal Science and Agriculture|
|Room number||Main Buiding|
|Mail address||kidak obihiro.ac.jp|