A nation-wide survey was conducted on so-called robot disease in growing and fattening cattle in Japan. Over a period of 5.5 years about 3, 000 cattle were affected with this disease on about 900 farms. They were about 2% of all the cattle raised on these farms. They manifested clinical symptoms 4-9 months after introduced into these farms, when about 80% of them weighed 200-400kg. These symptoms were curved back, extended and stiffened extremities, extended and deformed hoofs, disturbance of gait. and asta.sia.
Lipids occupied about 50-60% of the necrotic adipose tissue, while it did about 90% in the normal one. Moisture occupied more than 30% of the necrotic adipose tissue, while it did less than 15% of the normal one. Crude nitrogen and crude ash of the former were 2-3 times as much as those of the latter. Ca, Mg, P, Na, and K increased, but the saponification value decreased in the necrotic tissue. No acid value exhibited big changes in this tissue. More fat of high degree of saturation was accumulated in the necrotic than in the normal adipose tissue. TG occupied more than 98% of the lipids in the adipose tissue, regardless of necrotic or normal condition, of cattle which died of adiponecrosis. In the necrotic adipose tissue, Chi increased a little, but FFA or PL showed no remarkable changes.
A total of 1, 005 dead and condemned swine were revealed on large hog farms by a nation-wide survey on porcine gastric ulcer conducted in 1968. The positive rates of gastric pathological changes were 31.9% for keratinization, 19.5% for erosion, 16.0% for ulceration, 11.4% for hemorrhage, and 1.4% for perforation. Those of erosion and ulceration were high in well developed swine. Those of ulceration and hemorrhage were high in swine excreting bloody feces. The positive rate of keratinization was high and that of erosion low in swine with gastric contents containing no fibrous substance. When the pH of the cardiac and pyloric regions was less than 2.4, the positive rates of erosion and hemorrhage were low. When this pH exceeded 7.5, the positive rate of ulceration was high.