中央タイにおける肉用牛, 乳用牛及び水牛のミネラル栄養

抄録

Nutritional status of minerals of beef and dairy cattle and buffalo in central Thailand were investigated by evaluating the mineral concentrations in feedstuff and blood plasma of animals during both rainy and hot seasons. One hundred fifty nine females from 4 beef cattle herds, 1 buffalo herd and 3 dairy cattle herds were studied. Low Na concentrations (below O. 07 % on a dry matter basis) in pasture samples from the field for particular beef cow herd was observed. Cu concentrations in all the pasture samples were ranged from 4.2 to 13.5 mg/kg. More than 42% of animals from 2 beef cattle herds, a buffalo herd and a dairy cattle herd showed lower plasma Cu concentrations than the critical level (0.65 μg/ ml) . Iron and Se concentrations in forage samples had a wide variety ranging from 185 to 1345 and 0.033 to 1.127mg/kg, respectively. The concentrations K, Ca, Mg, P, Zn and Mn in diets totally fed were higher than the requirements for beef and dairy cattle. The concentrations of Ca, Mg, Pi, Fe and Zn in plasma of animals were normal.