The present invention relates to a method of regulating the seasonal breeding activity and/or seasonal physiological responses of animals utilising veterinary implants.
Previously described coated veterinary implants allow an active ingredient to be released at a predetermined rate to maintain a predetermined blood level of melatonin.
However, the manipulation of breeding activity was limited to relative brief delays in the onset of puberty or oestrus or relatively brief advancement in the onset of puberty or oestrus.
Accordingly difficulties of the prior art are substantially overcome by using the method of the invention. The method includes subjecting the animal to be treated to a first treatment with a veterinary composition including
(a) an effective amount of an active ingredient selected from melatonin or related chemicals of the indole class, as hereinbefore defined, or mixtures thereof, and
(b) a veterinarily acceptable carrier or excipient therefor;
at a preselected time relative to the normal breeding cycle of the animal;
and subjecting the animal to be treated to at least a second treatment with a veterinary composition as described above at a later preselected time relative to the normal breeding cycle of the animal. A composition for use in the above method is also provided.
本发明涉及一种利用兽用植入物调节动物季节性繁殖活动和/或季节性生理反应的方法。
以前描述的带涂层的兽用植入物可按预定速率释放活性成分,以维持预定的血液
褪黑激素水平。
然而,对繁殖活动的控制仅限于相对短暂地推迟青春期或发情期的到来,或相对短暂地提前青春期或发情期的到来。
因此,使用本发明的方法基本上克服了现有技术的困难。该方法包括用兽药组合物对待处理的动物进行第一次处理,兽药组合物包括
(a) 选自
褪黑素或
吲哚类相关
化学物质(如前所述)或其混合物的有效量的活性成分,以及
(b) 兽医可接受的载体或赋形剂;
在相对于动物正常繁殖周期的预选时间;
在相对于动物正常繁殖周期的稍后预选时间,用上述兽用组合物对待处理的动物进行至少第二次处理。还提供了一种用于上述方法的组合物。