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Administration of equine Chorionic Gonadotrophin (eCG) to rams to improve the reproductive performance during the non-breeding season
Livestock Science ( IF 1.8 ) Pub Date : 2020-06-05 , DOI: 10.1016/j.livsci.2020.104125
Florencia Beracochea , Jorgelina Manes , María Noel Viera , Julián Santiago-Moreno , Rodolfo Ungerfeld

In most ram breeds, there are annual changes in testosterone serum concentration and semen quality. This study aimed to determine if eCG administration to rams during the non-breeding season improves the reproductive activity. In the first study, we compared the effects of administering three doses of eCG (0, 400 or 700 IU). In the second experiment we compared the effects of administering eCG to rams from two breeds originated in different latitudes, and thus, with different expected reproductive seasonal pattern (Highlander; HL and Texel; TEX). The first study was performed during the mid non-breeding season with three groups of rams: treated with 400 IU (group eCG400) or 700 IU of eCG (group eCG700), or untreated controls (group CON). Treated rams received three doses of eCG administered every 6 days. Testosterone concentration, testicular traits (scrotal circumference, testicular and sexual skin flush, and ultrasonographic testes pixel color intensity) and seminal characteristics were determined from five days before the first eCG administration until Day 24. Testosterone concentration was greater in eCG700 than in eCG400 (P <0.001) and CON (P <0.0001) rams, and in eCG400 than in CON rams (P = 0.0002). However, the treatment did not modify the testicular traits and seminal quality. The second study was performed with 15 HL and 17 TEX rams; while 8 HL and 9 TEX rams received two doses of 1000 IU of eCG (Days 0 and 5), the other rams remained as untreated controls. Scrotal circumferences, seminal traits (fresh and thawed semen, and cryopreservation ratio –CR-) as well as the sexual behavior were determined, twice before eCG administration and during 3 weeks. The treatment did not modify the scrotal circumference nor the fresh sperm traits evaluated. However, the CR of motile and progressive motile sperm were greater in eCG treated rams than in control rams on Day 7 (P = 0.01 for both). Treated rams had their second and third ejaculations earlier than control rams (P = 0.001 and P = 0.02; respectively). In conclusion, the administration of eCG during the non-breeding season stimulated testosterone secretion without modifying the main reproductive outcomes of rams. Reducing the interejaculatory intervals could be considered for intensive semen collection programs.



中文翻译:

将马绒毛膜促性腺激素(eCG)施用到公羊以提高非繁殖季节的繁殖性能

在大多数公羊品种中,睾丸激素血清浓度和精液质量每年都有变化。这项研究旨在确定在非繁殖季节对公羊施用eCG是否能改善生殖活动。在第一项研究中,我们比较了施用三剂eCG(0、400或700 IU)的效果。在第二个实验中,我们比较了对来自不同纬度的两个品种的公羊施用eCG的效果,因此,它们具有不同的预期繁殖季节模式(Highlander; HL和Texel; TEX)。首次研究是在非繁殖季节中期对三组公羊进行的:用400 IU(eCG400组)或700 IU eCG(eCG700组)或未经处理的对照组(CON组)治疗。经治疗的公羊每6天接受三剂eCG给药。睾丸激素浓度P <0.001)和CON(P <0.0001)ram,eCG400中的比CON ram(P  = 0.0002)。但是,该治疗并没有改变睾丸的性状和精液质量。第二项研究是用15个HL和17个TEX柱塞进行的;虽然8个HL和9个TEX公羊接受了两次1000 IU eCG剂量(第0和5天),但其他公羊仍作为未处理的对照。在eCG给药前两次和3周内测定阴囊周长,精液特征(精液和融化的精液以及冷冻保存率–CR-)以及性行为。该治疗没有改变阴囊周长,也没有评估新鲜的精子特征。然而,在第7天,经eCG处理的公羊的活动精子和进行性活动精子的CR大于对照公羊(P 两者均为0.01)。处理过的公羊比对照公羊早 两次射精(分别为P  = 0.001和P = 0.02)。总之,在非繁殖季节施用eCG可以刺激睾丸激素的分泌,而不会改变公羊的主要繁殖结果。对于密集的精液收集计划,可以考虑缩短射精间隔。

更新日期:2020-06-05
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