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首页> 外文期刊>Zootecnia Tropical >Estrus manifestation and pregnancy rate in Tropical Milking Criollo heifers synchronized with a low dose of PGF2
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Estrus manifestation and pregnancy rate in Tropical Milking Criollo heifers synchronized with a low dose of PGF2

机译：低剂量PGF2与热带挤奶Criollo小母牛的发情表现和妊娠率

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In order to determine estrus manifestation and pregnancy rates in Tropical Milking Criollo (CLT) heifers synchronized to estrus with a low dose (12,5 mg) of PGF2 fifty-four cyclic virgin CLT heifers were randomly assigned to two treatments: 1) Low dose (DB; n=27): i.m. injection of 12,5 mg PGF2 ; and 2) Complete dose (DC, n=27; control group): i.m. injection of 25 mg PGF2 . From 12 h after PGF2 and during five days estrus was detected every 4 h for 30 min to determine the start and end of estrus, estrus duration and estrus manifestation rate. Heifers were artificially inseminated (IA) 12 h after estrus detection and were monitored by transrectal ultrasonography every 4 h from the end of estrus until ovuation to determine time and rate of ovulation. Repeat breeder heifers received a second IA service. Pregnancy was diagnosed 45 days after IA. Estrus manifestation and ovulation rates were 100% in both treatments. No significant (P>0.0%) difference was found among treatments for time of estrus and ovulation, estrus duration or pregnancy rate at first IA service. Pregnancy rate at second IA service and overall pregnancy rate were significantly (P<0.05) higher for DB than for DC (77.7% and 74% vs 30% and 37%), respectively. Estrus synchronization with a low dose of PGF2 resulted in an acceptable overall pregnancy rate in CLT heifers, which is reflected in a lower cost of the estrus synchronization program.
机译：为了确定与低剂量（12.5 mg）PGF2发情同步的热带挤奶克里奥尔（Colol）小母牛（CLT）的发情表现和妊娠率，将五十四个循环初生CLT小母牛随机分配至两种处理方法：1）低剂量（DB; n = 27）：即时消息注射12,5 mg PGF2;和2）全剂量（DC，n = 27;对照组）：注射25 mg PGF2。从PGF2注射后12小时到五天内，每4小时检测一次发情30分钟，以确定发情的开始和结束，发情持续时间和发情表现率。发情检测后12 h，对小母牛进行人工授精（IA），从发情结束至排卵，每隔4 h通过经直肠超声检查以测定排卵的时间和排卵率。重复育种小母牛获得了第二次IA服务。 IA后45天诊断为妊娠。两种疗法的发情表现和排卵率均为100％。在首次IA服务时，发情和排卵时间，发情持续时间或妊娠率的治疗之间未发现显着差异（P> 0.0％）。 DB的第二次IA服务时的妊娠率和总妊娠率显着高于DC（分别为77.7％和74％和30％和37％）（P <0.05）。用低剂量的PGF2发情同步导致CLT小母牛的总体受孕率可接受，这反映在发情同步计划的较低成本上。

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