title: Severe hypoplasia of the omasal laminae in a Japanese Black steer with chronic bloat--a case report.
abstract: 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.
authors.affiliation: Laboratory of Farm Animal Production Medicine, Kagoshima University, Kagoshima, Japan. mtakagi@agri.kagoshima-u.ac.jp
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Takagi
authors.forename: Shuhei
authors.initials: S
authors.lastname: Mukai
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Fushimi
authors.forename: Kouhei
authors.initials: K
authors.lastname: Matsushita
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Miyoshi
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Yasuda
authors.forename: Hideo
authors.initials: H
authors.lastname: Kitajima
authors.forename: Senro
authors.initials: S
authors.lastname: Takamure
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Matsushita
authors.forename: Nobuo
authors.initials: N
authors.lastname: Kitamura
authors.forename: Eisaburo
authors.initials: E
authors.lastname: Deguchi
mesh_terms: 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*