Use of a β2-Adrenergic Stimulant (Clenbuterol) for Eliminating Night-Time Calving

Journal of Veterinary Medical Science

Kiyokazu SATO¹  Toshio NAKAMURA¹  Masaharu MORIYOSHI¹  Keiichiro KAWATA¹  Kazushi TAGUCHI¹  Toshihiko NAKAO¹ 

关键词: cattle;    clenbuterol;    delaying parturition;    parturition;   

DOI  :  10.1292/jvms.54.19

学科分类：兽医学

来源: Japanese Society of Veterinary Science

【 摘 要 】

References(10)Cited-By(1)To determine whether β2-adrenergic stimulant (clenbuterol) would exhibit beneficial effects upon the elimination of night-time calving, 42 Holstein Friesian cows and heifers at the first stage of labour were injected intramuscularly twice with clenbuterol; 300 μg at 18:00 and 210 μg at 22:00. Other 26 cows and heifers of the same breed at the first stage of labour at 18:00 were not treated and served as controls. All of the treated animals, but one, calved after 5:00 in the next morning, showing a peak of parturition between 5:00 and 10:00. In contrast to this, 42% of the control animals calved at night between 22:00 and 5:00. Thus, the double administrations of clenbuterol were shown to be effective for eliminating night-time calving. The cows treated with clenbuterol tended to show lower incidences of dystocia and retained placenta and a higher first insemination conception rate than the control animals. No adverse effects of the treatment on the viability of newborn calves and milk yields were observed.

【 授权许可】

Unknown