نتایج جستجو برای: sheep embryo

تعداد نتایج: 107201  

2012
Ivanka B.R. Candappa Pawel M. Bartlewski

Artificial insemination (AI) and embryo transfer (ET) play an important role in the genetic improvement of sheep herds. This review primarily describes the methods that have recently been researched and/or adapted to circumvent the problematic anatomy of the ovine cervix, which prevents the widespread application of transcervical AI and ET in this species. A mechanism of cervical ripening at pa...

2012

Various assisted reproductive techniques have been developed and refined to obtain a large number of offspring from genetically superior animals or obtain offspring from infertile (or subfertile) animals. The embryo transfer is one assisted reproductive technique developed well, aimed at increased productivity of selected females, disease control, importation and exportation of livestock, rapid...

Ahmadi E Nazari H Ostadhosseini S, Shirazi A

Background: This study was designed to respond to the controversy regarding the necessity of oocyte activation after the ICSI procedure for normal embryo development in sheep. Materials and Methods: The effect of chemical stimulation with either 5mM ionomycin (I) for 5 minutes or ionomycin + 2 mM 6-dimethylaminopurine (6-DMAP) for 3 hours on the efficiency of ICSI, was compared in six experimen...

ژورنال: Anatomical Sciences Journal 2010
Kafilzadeh, Farokh, Soltani , Leila, Karami Shabankareh , Hamed, Kazemine Jasemi , Vida,

Purpose: The objective of this study was to evaluate the effects of myo-inositol alone or in combination with MEM vitamins on embryo development in sanjabi sheep.Materials and Methods: Sheep Cumulus Oocytes Complexes (COCs) were matured in vitro at 39ºC, in humidified 5% CO2 atmosphere for 22-24 h. There were three treatments, culture in synthetic oviductal fluid medium (treatment I), culture i...

2004
T. K. Stenbak C. Navanukraw H. R. Berginski M. J. Toutges J. D. Kirsch K. C. Kraft J. J. Bilski D. A. Redmer L. P. Reynolds

Through the use of assisted reproductive technology (ART), we will be able to extend the use of genetically superior animals, and perhaps increase the number of offspring. These technologies include such procedures as estrus synchronization, superovulation, artificial insemination, embryo transfer, in vitro fertilization (IVF), and cloning. Because they exhibit seasonal breeding and multiple ov...

Journal: :Journal of the College of Physicians and Surgeons--Pakistan : JCPSP 2014
Hady Khoshmohabat Javad Akhavan Moqadam Saeedeh Zienab Sohrabi Mohammad Hosein Kalantar Motamedi Taghi Azizi

Hydatid disease is a cyclozoonotic infection caused by the cestode genus Echinococcus. It occurs throughout the world and is especially common in sheep- and cattle-raising regions of Africa, Australia, New Zealand, India, the Middle East, South America, and the Mediterranean. The incidence of humans infected with hydatid disease is approximately 1-2:1000. It is higher in rural areas. Infection ...

Journal: :Differentiation; research in biological diversity 2002
James A Byrne John B Gurdon

Human cloning refers to the production of genetically identical humans. This cloning is possible via either ‘‘embryo splitting’’ or ‘‘nuclear transfer’’. Embryo splitting involves the separation of an early human embryo into two or more parts. Each of these parts has the potential to develop into a blastocyst (late embryo), which, if implanted, can develop into a child. This is how genetically ...

Journal: :Animal reproduction science 2000
J G Thompson

At the beginning of the 1990s, co-culture of cattle and sheep embryos was the most favoured method to support embryo development, but the use of this system has hampered progress in raising the efficiency of embryo production. Furthermore, little was known of the requirements of embryos and the biochemistry of early embryo development. As the decade progressed, energy metabolism studies improve...

Journal: :Journal of animal science 2008
Q Y Li H Guan J Hou X R An Y F Chen

The aim of this experiment was to examine whether a simplified mini-laparotomy technique is suitable for embryo transfer in ewes. In vitro produced blastocysts were transferred to the uterine horns of synchronous recipient ewes. Each recipient received 1 embryo by conventional laparotomy (n = 36), laparoscopy (n = 21), or by simplified mini-laparotomy (n = 33). Pregnancy rates for these 3 trans...

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