Effects of dietary clenbuterol on net flux across the portal-drained viscera, liver and hindquarters of steers (Bos taurus)

Joan H. Eisemann , Gerald B. Huntington
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引用次数: 6

Abstract

1. Addition of the β-adrenergic agonist clenbuterol to the diet of steers increased blood flow in portal-drained viscera, liver and tissues of the hindquarters.

2. Uptake of oxygen increased with clenbuterol feeding in hindquarters but not portal-drained viscera or liver.

3. On day 1 of clenbuterol feeding, the principal source of circulating l-lactate switched from portal-drained viscera to hindquarters.

4. Both net release of α-amino nitrogen by the portal-drained viscera and net uptake by the hindquarters decreased on day 1 of clenbuterol feeding. Over time of clenbuterol feeding, both release of α-amino nitrogen by the portal-drained viscera and uptake by the hindquarters increased to equal or greater than pretreatment values, respectively.

饲粮中添加瘦肉精对牛门静脉引流脏器、肝脏和后腿净通量的影响
1. 饲粮中添加β-肾上腺素能激动剂克仑特罗可增加门静脉引流的内脏、肝脏和后腿组织的血流量。饲喂瘦肉精后后腿的吸氧量增加,但门静脉排出的脏器或肝脏的吸氧量没有增加。在喂食克仑特罗的第1天,循环l-乳酸的主要来源从门静脉排出的内脏转向了后肢。在饲喂克仑特罗的第1天,门静脉排出的内脏对α-氨基氮的净释放量和后腿对α-氨基氮的净吸收量均下降。随着饲喂克仑特罗时间的延长,门脉排水脏器α-氨基氮的释放量和后腿对α-氨基氮的吸收量分别增加到等于或大于预处理值。
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