肥育牛における糞尿中へのクロピラリド排泄. (Japanese)

Clopyralid excretion in feces and urine of beef cattle. (English)

To clarify the excretion of clopyralid in feces and urine of beef cattle, four Japanese Black beef cattle (14 months old on average, body weight 425 kg on average) were used for balance trial (16 days for treatment adaptation period and 5 days for sampling period). The experimental feed contained almost 20% of Colored Guinea grass hay and 80% of commercial concentrate which was designed to achieve average daily weight gains of 0.2 kg/day. Commercial clopyralid reagent was added to commercial concentrates (1 mg/kg). All feces and urine were collected daily using an automatic fecesurine separating machine and weighed in the sampling period. The amount of feed and orts were also weighed daily. The excretion of clopyralid into feces and urine of experimental cattle were examined based on clopyralid concentrations in feed, feces and urine and feed intake, total feces and total urine. As a result, of all the excreted clopyralid, almost 91% was excreted in urine and 9% was excreted in feces, which was similar to the previous reports of lactating cows and ruminants. [ABSTRACT FROM AUTHOR]

肥育牛での糞尿へのクロピラリド排泄を明らかにするため，黒毛和種肥育牛4 頭（平均14 ヵ月齢， 平均体重425 kg）を供試して，馴致期16 日間，本試験期5 日間とする消化試験を行った．供試飼料はカラー ドギニアグラス乾草および市販配合飼料とし，粗濃比約2 : 8 で日増体量0.2 kg となるよう給与した．配合 飼料には濃度が1.0 mg/kg となるよう市販クロピラリド試薬を添加した．本試験期には糞尿分離機付きス トールにおいて，全糞および全尿を分離採取した．また飼料摂取量を計測した．飼料，糞および尿中クロピラ リド濃度と飼料摂取量，全糞量および全尿量により，摂取したクロピラリドの糞や尿中への分配率を算出し た．その結果，糞尿中へ排泄されたクロピラリドのうち，糞への分配率は9%，尿への分配率は91% となり， 乳用牛や反芻動物での既報と同様に，クロピラリドの多くは尿中へ排泄されることが明らかとなった．. [ABSTRACT FROM AUTHOR]

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