The pharmacokinetics and tissue residue of tylosin in broiler chickens were studied after I.V. and oral administrations in a dose of 50 mg tylosin/kg.b.wt. Tylosin was obeyed a two-compartment open model following I.V...The pharmacokinetics and tissue residue of tylosin in broiler chickens were studied after I.V. and oral administrations in a dose of 50 mg tylosin/kg.b.wt. Tylosin was obeyed a two-compartment open model following I.V. administration at a dose of 50 mg/kg.b.wt. The disposition kinetics of tylosin following I.V. administration revealed that tylosin was highly distributed with V<sub>d(area)</sub> of 6 L/kg and eliminated with half-life (t<sub>1/2β</sub>) equal to 7.29 hours. The disposition kinetics of tylosin following oral administration revealed that the maximum blood concentration (C<sub>max</sub>) was 3.40 μg/ml attained at (t<sub>max</sub>) of 1.08 hour. Tylosin was eliminated with half-life (t<sub>1/2β</sub>) equal to 5.78 hours. The mean systemic bioavailability of tylosin after oral administration was 90.29%. Following repeated oral administration of 50 mg tylosin base/kg.b.wt once daily for 5 consecutive days, the blood (μg/ml) and tissue (μg/g) residues of tylosin showed that liver, kidney and lung contained the highest tylosin residues and completely disappeared from those tissues at 6 days after the last oral dose. Chickens should not be slaughtered for human consumption within the treatment and 6 days after the last oral administrations of tylosin.展开更多
Testosterone（17β-hydroxyandrost-4-en-3-one）is a19-carbon steroid hormone with potent androgenic properties.It maintains testicular function and develop secondary male sex characteristics.It also has strong anabolic...Testosterone（17β-hydroxyandrost-4-en-3-one）is a19-carbon steroid hormone with potent androgenic properties.It maintains testicular function and develop secondary male sex characteristics.It also has strong anabolic effects,which initiates increased protein synthesis in muscle and bone[1].In the1950s,the recognition of the growth promoting properties of such a hormone展开更多
文摘The pharmacokinetics and tissue residue of tylosin in broiler chickens were studied after I.V. and oral administrations in a dose of 50 mg tylosin/kg.b.wt. Tylosin was obeyed a two-compartment open model following I.V. administration at a dose of 50 mg/kg.b.wt. The disposition kinetics of tylosin following I.V. administration revealed that tylosin was highly distributed with V<sub>d(area)</sub> of 6 L/kg and eliminated with half-life (t<sub>1/2β</sub>) equal to 7.29 hours. The disposition kinetics of tylosin following oral administration revealed that the maximum blood concentration (C<sub>max</sub>) was 3.40 μg/ml attained at (t<sub>max</sub>) of 1.08 hour. Tylosin was eliminated with half-life (t<sub>1/2β</sub>) equal to 5.78 hours. The mean systemic bioavailability of tylosin after oral administration was 90.29%. Following repeated oral administration of 50 mg tylosin base/kg.b.wt once daily for 5 consecutive days, the blood (μg/ml) and tissue (μg/g) residues of tylosin showed that liver, kidney and lung contained the highest tylosin residues and completely disappeared from those tissues at 6 days after the last oral dose. Chickens should not be slaughtered for human consumption within the treatment and 6 days after the last oral administrations of tylosin.
基金supported by the National Natural Science Foundation of China(Grant No.U1204310)the Key Scientific & Technological Project of Education Department in Henan Province of China(Grant No.2011A230003)
文摘Testosterone（17β-hydroxyandrost-4-en-3-one）is a19-carbon steroid hormone with potent androgenic properties.It maintains testicular function and develop secondary male sex characteristics.It also has strong anabolic effects,which initiates increased protein synthesis in muscle and bone[1].In the1950s,the recognition of the growth promoting properties of such a hormone
