1997〜1999年の3カ年の4〜9月に北海道日高地方の子馬16,701頭について，総死亡頭数と胃潰瘍による死亡頭数を比較した．また胃潰瘍病変の確認できた40頭を対象に臨床経過，胃潰瘍の好発部位 および傷害の程度を調査した．子馬総死亡頭数に占める胃潰瘍死亡例の割合は1997年13.6％，1998年16.2％，1999年7.1％であった．胃潰瘍による死亡率は6，7月および9月に高い傾向があった．初診時の平均日齢は，生存群では61.9±27.5日，死亡群では77.3±38.7日であり，両群に有意差はなかった．治療日数は両群で10日以下が70％と多くを占めた．初診時の臨床症状は，下痢（65.0％），沈うつ（82.5％）および断続的哺乳（82.5％）が多くを占めた．胃潰瘍発生部位 は，大弯部ヒダ状縁87.5％，小弯部ヒダ状縁82.5％，無腺部92.5％および腺部60.0％であった．胃潰瘍の傷害は大弯部ヒダ状縁と小弯部ヒダ状縁で，よりひどい傾向にあった．

―キーワード：下痢，子馬，胃潰瘍．

Gastric Ulceration in Foals in the Hidaka District
(1997〜1999)

   Mortality from gastric ulceration and total mortality in 16,701 foals from 1997 to 1999 were compared. Clinical signs and gastric-ulcer sites and severity were examined in 40 foals. Mortality from gastric ulcers was 13.6% in 1997, 16.2% in 1998, and 7.1% in 1999. Mean age at initial examination was 61.9±27.5 days in the live group and 78.3%±37.7 days in the dead group. Medical treatment lasted for less than 10 days in the greater number of animals (P＜0.01). Clinical signs were diarrhea (65.0%), depression (82.5%), intermittent nursing (82.5%), colic (37.5%), bruxism (10.0%), and ptyalism (7.5%). Ulcerous lesions in the stomach were observed along the greater curvature in the Margo plicatus (87.5%), along the lesser curvature of the Margo plicatus (82.5%), in the squamous fundus (92.5%), and in the glandular fundus (60.0%). Severity was greater in gastric ulcers occurring along the greater and lesser curvatures of the Margo plicatus.

―Key words : diarrhea, foal, gastric ulceration.

†　Correspondence to :

Sadao TAHARAGUCHI (Hidakachiku-Nosai) 8 Hokuseicho, Niikappu-cho, Niikappu-gun, Hokkaido 059-2403, Japan TEL 01464-7-2733　FAX 01464-5-7015