メン羊に硝酸塩を与えた場合のメトヘモグロビン形成における個体差発生の要因について

概要

論文の詳細を見る
A group of six adult Japanese Corriedale wethers, averaging 35 kg in body weight, was used to study the individual differences in methemoglobin formation caused by the dietary nitrate intake. Each animal was kept in individual pens and fed chopped timothy hay twice daily, with free water and trace mineral salts, for eighteen months prior to the experiment. At the interval of ten days for 40 days, four successive treatments were conducted. After the animals had ingested 500g of hay in the morning, sodium nitrate was administered into rumen by stomach tube at 0.0379% of body weight. After ten days, sodium nitrate was injected into blood vessels intravenously at 0.0015% of body weight. At the 20th and 30th days, the similar treatments were conducted by using nitrite, at 0.0034% of body weight into rumen and at 0.00090% of body weight into blood vessels. Nitrate and nitrite concentrations in rumen fluid and blood plasma were measured several times a day at each days of experiments to study individual differences in methemoglobin formation. Significant differences were found among individual animals in the amounts of methemoglobin by administering the same amount of nitrate into rumen. Small individual differences were found in methemoglobin formation when nitrite was put into rumen and blood vessel. Direct injection of nitrate into blood did not cause methemoglobin formation. Therefore, different methemoglobin concentrations in blood seemed to be correlated with the amount of nitrite remained in the rumen. Since there was no evidence of reduction from nitrate to nitrite in blood, it seemed that individual differences of methemoglobin concentration in blood was due to the differences of rumen functions, in which different levels of nitrite were formed from nitrate.
社団法人日本畜産学会の論文

メン羊に硝酸塩を与えた場合のメトヘモグロビン形成における個体差発生の要因について

スポンサーリンク

概要

著者

関連論文

スポンサーリンク