冷冻保护剂种类和胚胎发育阶段对绵羊冷冻胚胎移植受胎率的影响
2015-12-03胡艳芳梁景山耿宗帅杨福刘海军
胡艳芳+梁景山+耿宗帅+杨福+刘海军


摘 要: 对冷冻保护剂种类和胚胎发育阶段对绵羊冷冻胚胎受胎率的影响进行了研究。结果表明: 分别以乙二醇、甘油为冷冻保护剂冷冻保存绵羊囊胚,解冻后移植受胎率差异不显著,表明冷冻保护剂种类对绵羊冷冻胚胎移植受胎率未有明显影响;以乙二醇为冷冻保护剂,冷冻绵羊不同发育阶段的胚胎,囊胚、扩张囊胚解冻后移植受胎率均明显高于桑椹胚的,囊胚和扩张囊胚之间差异不显著,表明胚胎发育阶段对绵羊冷冻胚胎移植受胎率有显著影响。
关键词:乙二醇;甘油;胚胎发育阶段;移植受胎率;绵羊
中图分类号:S814.6 文献标识码:A DOI 编码:10.3969/j.issn.1006-6500.2015.11.008
Effects of Cryoprotectents Kinds and Embryonic Development Stages on Pregnancy Rates of Frozen Sheep Embryos
HU Yan-fang1, LIANG Jing-shan1, GENG Zong-shuai2, YANG Fu2, LIU Hai-jun3
(1. Xiaying Animal Sciences and Veterinary Medicine Station, Tianjin 300193,China; 2. Ji County Animal Health Supervision and Inspection Institute, Tianjin 301900 ,China; 3. Tianjin Institute of Animal Sciences and Veterinary Medicine, Tianjin 300384,China)
Abstract: The effects of cryoprotectents kinds and embryonic development stages on pregnancy rates of frozen sheep embryos were deermined. The results showed that when ethylene glycol and glycerol was used as cryoprotectents separately, no significant difference was found in pregnancy rates of frozen sheep blastocysts, so cryoprotectents kinds had no effects on pregnancy rates. When ethylene glycol was used as cryoprotectents, the pregnancy rates of frozen sheep blastocysts and expanded blastocysts were significantly higher than that of morulas, but no significant difference was found between blastocysts and expanded blastocysts, so cryoprotectents kinds had significant effects on pregnancy rates.
Key words: ethylene glycol; glycerol; embryonic development stages; pregnancy rates; sheep
绵羊胚胎冷冻作为一种引种的手段,在引进国外优良的肉羊品种如杜泊[1-2]、萨福克[3]、无角陶塞特[4]绵羊时,以及在细毛羊育种中[5-6]已经得到广泛应用。
影响胚胎冷冻效果的因素有多种,如胚胎质量、发育阶段、冷冻方法、冷冻保护剂种类、受体发情时间及营养状况等。徐小波等[2]的研究表明,冷冻桑椹胚和囊胚阶段的杜泊绵羊胚胎,移植后的受胎率囊胚显著高于桑椹胚。而王永军等[1]的研究表明,5、6日龄杜泊羊冻胚受胎率显著高于4、7日龄胚胎。 Cocero等[7]对用乙二醇和甘油冷冻保存绵羊的桑椹胚和囊胚的冷冻效果进行了比较,解冻后形态正常的胚胎移植后,用乙二醇冷冻的胚胎体内发育率高于甘油的。
本研究采用程序冷冻法,采用不同的冷冻保护剂,以及对绵羊不同发育阶段的胚胎进行了冷冻保存和移植,目的在于建立一个适宜的绵羊胚胎冷冻保存体系,以获得较为理想的胚胎存活和受胎率,为在绵羊胚胎移植产业化中大规模应用胚胎冷冻技术奠定基础。……
