Severe hypoplasia of the omasal laminae in a Japanese Black steer with chronic bloat--a case report.
An 11-month-old Japanese Black steer with chronic bloat underwent clinical and histological analyses. During the observation period, it showed normal appetite and fecal volume but persistent chronic bloat symptoms. Compared to controls, the steer's feces contained undigested large straws. Necropsy revealed normal rumen, reticulum, and abomasum but a small omasum. The rumen, reticulum, and abomasum mucosa was normal, with well-developed ruminal papillae. However, severe hypoplasia of the omasal laminae was observed along with hypoplasia reticular groove and ruminoreticular fold. The contents of the reticulum, omasum, and abomasums comprised undigested large sized hay particles. The omasum papillae showed no pathological abnormalities. This is a rare case of a steer with chronic bloat probably caused by severe hypoplasia of the omasal laminae.
Takagi
Mitsuhiro
M
Laboratory of Farm Animal Production Medicine, Kagoshima University, Kagoshima, Japan. mtakagi@agri.kagoshima-u.ac.jp
Mukai
Shuhei
S
Fushimi
Yasuo
Y
Matsushita
Kouhei
K
Miyoshi
Nobuaki
N
Yasuda
Nobuhiro
N
Kitajima
Hideo
H
Takamure
Senro
S
Matsushita
Toshihiko
T
Kitamura
Nobuo
N
Deguchi
Eisaburo
E
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000473:pathology*; D005243:Feces; D005753:Gastric Mucosa / Q000473:pathology; D008297:Male; D009851:Omasum / Q000473:pathology*; D013272:Stomach Diseases / Q000473:pathology / Q000662:veterinary*