Ovum pick up and in vitro production in the bovine after use in several generations: a 2005 status.
The first In Vitro Produced (IVP) calf was born in 1981 and the non-surgical Ovum Pick Up (OPU) technique for the bovine was adapted from the human in 1987. Since then, considerable research has been aimed at improving both technologies in the bovine. Both OPU and IVP can now be seen as mature technologies. It can be estimated that more than 200,000 IVP calves have been born world wide to date, and when the two technologies are combined they are capable of producing over 50 calves per donor cow per year, albeit with a large variation between donors. Not many new breakthroughs are expected for OPU. For IVP however, automation and miniaturization as well as a greater understanding of the embryo through the application of gene based technologies such as micro-arrays, may provide an in vitro environment that is more in vivo-like than traditional micro drop/well systems. This improved environment should result in higher embryo developmental rates as well as improved quality and welfare of subsequent offspring. The application of OPU/IVP has progressed from treating infertile high genetic multiple ovulation and embryo transfer (MOET) cows in commercial situations to enhancing breeding scheme designs. With the bovine genome being rapidly sequenced and bovine genes for traits of economic interest becoming available in the coming years, OPU/IVP will prove invaluable in rapidly multiplying rare genes or Quantitative Trait Loci (QTL) of high value. In due course, it is anticipated that Marker Assisted Selection or Gene Assisted Selection (MAS/GAS) schemes will be more widely implemented. In addition, OPU, and particularly IVP, provide the basis for more advanced technologies such as cloning and transgenics. This paper is dedicated to celebrate and recognize the significant contributions made by Theo Kruip (1939-2003) to the wide area of bovine OPU and IVP.
van Wagtendonk-de Leeuw
A M
AM
Livestock Improvement Corporation, Hamilton, New Zealand. janneke.vanwagtendonk@fonterra.com
D000818:Animals; D001947:Breeding / Q000379:methods*; D002417:Cattle / Q000196:embryology / Q000502:physiology*; D004624:Embryo Transfer / Q000662:veterinary; D004622:Embryo, Mammalian / Q000502:physiology*; D005260:Female; D009865:Oocytes / Q000502:physiology*; D006080:Ovarian Follicle / Q000502:physiology; D027724:Reproductive Techniques, Assisted / Q000662:veterinary*; D012641:Selection, Genetic; D020858:Tissue and Organ Harvesting / Q000662:veterinary