牛のグラステタニーに関する研究 : I. 外山放牧地におけるグラステタニーの発生例

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The first occurrence of grass tetany in grazing beef cattle in Japan was describedand studied clinicohematologically. It was observed in the Sotoyama pasture in IwatePrefecture during a period from May to June, 1971.The results obtained are as follows.l) Ten Japanese Short Horn cows (beef cattle) were affected. All of them, exceptOIIC which was 2 months old, were from 4 to 12 years of age, nursing calves 37 to 77days old.These animals manifested the clinical signs of grass tetany 4 to 18 days after thestart of grazing in the pasture. They were in poor conditions. Two of them diedapparently of grass tetany.The mean temperature was about 1OC over a period of occurrence of this disease.Orchard grass was growing predominantly in this pasture at that time.2) The characteristic clinical signs consisted of excitement, hyperesthesia, tremblingof muscle in various parts of the body, stillness and staggering in the gait, and finalconvtulsion and tetany. In addition, salivaiton, tachypnea and dyspnea, cyanosis of thevisible mucous membranes, diarrhea and frequent urination were recognized.Moreover, hypomagnesemia, sliglat decrease in calcium, high value in the ratio ofCa 7 lNIg, and increase in S-GOT activity were detected hematologically.3) The concentrations of rumen ammonia in cows No. 3, 4, and 5 with hypo-magnesemic tetany were 23.0, 47.S, and 54.3 rug per 100 ml, respectively.4) A subcutaneous injection with TOO to 200 ml of a 25 percent solution of magne-slum sulfate per adult cow was very efficient for hypomagnesemic tetany in cattle.5) Blood examination was carried out on 47 beef cows grazing on the pasturewlaere grass tetany had occurred. The serum magnesium level was higher than 1 .51 rugper [00 ml in 22 cows, between 1.01 and 1.50 rug in 16 cows, and below 1.0 mg in 9 cows.The cattle with hypomagnesemia showed slight hypocalcemia, hypoproteinemia,and an increase in S-GOT activity, but no significant changes in serum chloride, sodium,or potassium concentration.6) The soil of the area where grass tetany had occu
1972-12-25

牛のグラステタニーに関する研究 : I. 外山放牧地におけるグラステタニーの発生例

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