Home the digest New cryopreservation procedure wins Brain Preservation Prize New cryopreservation procedure wins Brain Preservation Prize First preservation of the connectome demonstrated in a whole brain February 9, Left: Control rabbit brain, showing neuropil near the CA1 band in the hippocampus.
Linkedin Share Button Research in Assisted Reproductive Technologies Various 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.
Artificial Insemination and Cryopreservation Artificial insemination AI has been used to obtain offspring from genetically superior males for more than years. Improvements in methods to cryopreserve freeze and store semen have made AI accessible to more livestock producers.
In the same manner as cryopreservation of semen, embryo freezing allowed for the global commercialization of animals with high genetic qualities. Semen from bulls is especially amenable to freezing and long-term storage.
In the dairy industry, where large numbers of dairy cows are managed intensely, AI is simple, economical, and successful. More than 60 percent of dairy cows in the United States are bred by AI.
However, the situation is different for beef cattle, where breeding populations are usually maintained on range or pasture conditions. In the United States beef industry, AI accounts for less than 5 percent of inseminations.
For reasons that are not yet well understood, it is more difficult to freeze and store semen from other livestock species, including horses, pigs, and poultry, than it is to freeze cattle semen. Multiple Ovulation and Embryo Transfer Development of embryo transfer technology allows producers to obtain multiple progeny from genetically superior females.
Depending on the species, fertilized embryos can be recovered from females also called embryo donors of superior genetic merit by surgical or nonsurgical techniques. The genetically superior embryos are then transferred to females also called embryo recipients of lesser genetic merit.
In cattle and horses, efficient techniques recover fertilized embryos without surgery, but only one or sometimes two embryos are produced during each normal reproductive cycle.
In swine and sheep, embryos must be recovered by surgical techniques. To increase the number of embryos that can be recovered from genetically superior females, the embryo donor is treated with a hormone regimen to induce multiple ovulations, or superovulation.
Immature oocytes female eggs can be obtained from ovaries of infertile or aged females, or from regular embryo donors described above. Ovum egg pick up is a nonsurgical technique that uses ultrasound and a guided needle to aspirate immature oocytes from the ovaries. Sex Determination of Sperm or Embryos The beef industry in the United States prefers male calves, which tend to have higher body weights and higher feed efficiency compared to female or heifer calves when placed in feedlots for the growing and finishing stages of meat production.
In contrast, the dairy industry prefers heifer calves, which will ultimately produce offspring and milk for human consumption. Thus, methods are needed to determine the sex of sperm or embryos so producers can control the sex of the offspring of their livestock. In cattle, the X-bearing sperm contain 3.
In mammals, the presence of a Y chromosome and one X chromosome determines that the individual will be a male. Female mammals contain 2 X chromosomes.The International Research Conference Aims and Objectives The International Research Conference is a federated organization dedicated to bringing together a significant number of diverse scholarly events for presentation within the conference program.
N'Nan et al. Page International Journal of Agronomy and Agricultural Research (IJAAR) RESEARCH PAPER OPEN ACCESS Ultrastructural changes during cryopreservation of plumules.
Beads, Citrus, Cryopreservation, Encapsulation-dehydration, Liquid nitrogen, Re-culture, 2, 3, 5-triphenyl tetrazolium ABSTRACT Ex-situ conservation of the Citrus has been considered as problematic and early reports have found that Citrus was a sub orthodox .
This is because research in this area is recent and addressed by very few teams worldwide and because recalcitrance is a dynamic concept which involves research on the biology of species and improvement in classical storage procedures.
Cryopreservation, the process by which cells are preserved by cooling to sub-zero temperatures, provides a prolonged, efficient, and effective storage option for cells within research environments. View Sperm Cryopreservation Research Papers on yunusemremert.com for free.