Lourens D C
Department of Theriogenology, Faculty of Veterinary Science, University of Pretoria, Republic of South Africa.
J S Afr Vet Assoc. 1988 Mar;59(1):41-3.
This paper describes a pilot trial carried out, to investigate the use of progesterone releasing intravaginal device(PRID) in controlled breeding in heifers under South African conditions. PRID's containing progesterone and oestradiol benzoate were employed for oestrus synchronization and reproductive management in ten 18-month-old, well-managed, heifers in a commercial Transvaal highveld dairy herd. PRID's were inserted into the vagina of each animal and removed after 12 days. Oestrus observation was done continuously and on the first observed oestrus the heifers were artificially inseminated once. Oestrus detection continued normally for returns to oestrus. Pregnancy was confirmed by rectal palpation eight weeks after breeding if no return to oestrus had occurred. The incidence of clinical oestrus within 3 days after removal of the PRID's (defined as the oestrus response) was 90%. The conception or pregnancy rate following the first artificial insemination was 77.8%.
本文描述了一项试点试验，该试验旨在研究在南非条件下，孕酮释放阴道装置（PRID）在小母牛同期发情配种中的应用。含有孕酮和苯甲酸雌二醇的PRID被用于一个商业性德兰士瓦高草原奶牛场中10头18月龄、管理良好的小母牛的发情同步化和繁殖管理。将PRID插入每头动物的阴道内，12天后取出。持续进行发情观察，在首次观察到发情时，对小母牛进行一次人工授精。对于返情的情况，继续正常进行发情检测。如果没有返情，在配种8周后通过直肠触诊确认妊娠。取出PRID后3天内临床发情的发生率（定义为发情反应）为90%。首次人工授精后的受孕率或妊娠率为77.8%。
