The distribution of maternal immunoglobulins in the mouse uterus and embryo in the days after implantation has been studied on sections incubated with sheep Fab anti-mouse immunoglobulins labeled with peroxidase. At the time of implantation the blastocyst is already surrounded by immunoglobulins that are also present in the blastocoel and early endoderm; uterine glands contain large amounts of ...

After infection with varicella-zoster virus, HeLa and human embryo lung cells developed a receptor for the Fc portion of human and rabbit immunoglobulin G. The receptor was detected by both hemadsorption and immunofluorescence, using antibody-coated erythrocytes and heat-aggregated immunoglobulin G. However, sheep erythrocytes sensitized with F(ab')2 of anti-sheep erythrocyte antibody did not a...

Natural scrapie transmission from infected ewes to their lambs is thought to occur by the oral route around the time of birth. However the hypothesis that scrapie transmission can also occur before birth (in utero) is not currently favoured by most researchers. As scrapie is an opportunistic infection with multiple infection routes likely to be functional in sheep, definitive evidence for or ag...

Nuclear transfer is a complex multistep procedure that includes oocyte maturation, cell cycle synchronization of donor cells, enucleation, cell fusion, oocyte activation and embryo culture. Therefore, many factors are believed to contribute to the success of embryo development following nuclear transfer. Numerous attempts to improve cloning efficiency have been conducted since the birth of the ...

Submit Manuscript | http://medcraveonline.com Abbreviations: AI: Artificial Insemination; ANFs: AntiNutritional Factors; BHP: Black Head Persian (sheep); BSE: Bovine Spongiform Encephalopathy; EAZ: East African Zebu; ET: Embryo transfer; FAO: Food and Agriculture Organization; LN: Liquid Nitrogen; MAS: Marker Assisted Selection; MARI: Mikocheni Agricultural Research Institute; MOET: Multiple Ov...

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...

In 1984 Sabine Meinecke-Tillmann [5] and Burkhard Meinecke [6] published their article ?Experimental Chimeras ? Removal of Reproductive Barrier Between Sheep and Goat? in Nature. Their study conquered the reproductive barrier between sheep [7] and goats through embryo manipulation. Their article appeared in Nature on the same day that a similar experiment, conducted by Carole Fehilly [8], Steen...