Moeini M M, Moghaddam A A, Bahirale A, Hajarian H
Department of Animal Science, Faculty of Agriculture, Razi University, Kermanshah, Iran.
Pak J Biol Sci. 2007 Nov 1;10(21):3801-7. doi: 10.3923/pjbs.2007.3801.3807.
A trial was conducted to evaluate the effects of FGA (Fluorogestone acetate) and CIDR (Controlled internal drug release) on the induction of estrus and pregnancy and fecundity rates of the Sanjabi and Lori sheep. A total of 360 Sanjabi and Lori sheep were randomly grouped into two treatments with intravaginal devices inserted for 13 days: Group FGA (40 mg FGA, n = 180) and Group CIDR (n = 180). All ewes received an i.m. injection of 400 IU eCG (equine chorionic gonadotrophin) at devices removal. Estrous was assessed by exposing all ewes to vasectomized rams at 12 h intervals. Cervical artificial insemination was performed 12 h after estrus onset. The overall estrus response was 72.5%. The source of progestin did not influence the efficiency of estrus response but a significant difference (p<0.05) was found between the breed groups (Lori: 88.6%, Sanjabi: 58.3%). Among the sheep that received either CIDR or FGA, estrus response was significantly (p<0.05) higher in the Lori (CIDR: 82.2%, FGA: 91.1%) than in the Sanjabi (CIDR: 64.4%, FGA: 52.2%) breed. The lambing and fecundity rates for all groups were 60.2% and 1.2 +/- 0.03, respectively. No significant differences in term of the lambing and fecundity rates were recorded between CIDR and FGA groups and among Lori and Sanjabi breed. The results of this study indicate the source of progestin or sheep breed did not influence the pregnancy and fecundity rates. The sheep breed influences the estrous response rate while the source of progestin did not affect the estrous response.
进行了一项试验，以评估醋酸氟孕酮（FGA）和控制内药物释放装置（CIDR）对桑贾比羊和洛里羊发情诱导、妊娠及繁殖率的影响。总共360只桑贾比羊和洛里羊被随机分为两组，阴道内置入装置13天：FGA组（40毫克FGA，n = 180）和CIDR组（n = 180）。所有母羊在取出装置时接受一次400国际单位马绒毛膜促性腺激素（eCG）的肌肉注射。通过每隔12小时让所有母羊接触输精管结扎的公羊来评估发情情况。发情开始后12小时进行子宫颈人工授精。总体发情反应率为72.5%。孕激素来源不影响发情反应效率，但品种组间存在显著差异（p<0.05）（洛里羊：88.6%，桑贾比羊：58.3%）。在接受CIDR或FGA的绵羊中，洛里羊（CIDR组：82.2%，FGA组：91.1%）的发情反应显著高于桑贾比羊（CIDR组：64.4%，FGA组：52.2%）。所有组的产羔率和繁殖率分别为60.2%和1.2±0.03。CIDR组和FGA组以及洛里羊和桑贾比羊品种间在产羔率和繁殖率方面未记录到显著差异。本研究结果表明，孕激素来源或绵羊品种不影响妊娠率和繁殖率。绵羊品种影响发情反应率，而孕激素来源不影响发情反应。
