الكاتب: Multiple References

I n bovine obstetrics, abdominal straining can be briefly interrupted with epidural anesthesia but uterine contractions cannot (1-3). However, some sympathomimetic compounds selectively block smooth muscle contraction and their effect on the uterus is known as tocolysis (4-7). One of these, clenbuterol, is a potent smooth muscle relaxant, noted for its rapid, strong, durable, and safe action (4,8). The drug's tocolytic properties have been reviewed (9) and its effectiveness as an aid for surgical corrections of dystocias in cows and ewes has been reported (10). Although publications on the use of clenbuterol for manual correction of dystocias exist (4,5,11-19), very few provide detailed information on the practical application of the drug in the field. This paper discusses the use of clenbuterol in manual corrections of dystocias involving 219 cows.