Enhanced comment feature has been enabled for all readers including those not logged in. Click on the Discussion tab (top left) to add or reply to discussions.
Embryo Transfer (ET): Data Collection And Utilization
THIS PAGE CONTAINS A DRAFT OF INFORMATION BEING EVALUATED FOR INCLUSION AS AN OFFICIAL GUIDELINE
Please do not cite this page until this message has been removed.
UNDER CONSTRUCTION
Motivation
Data from animals that result from embryo transfer can have non-genetic effects that must be accounted for in the genetic evaluation.
Recipient dam considerations
Age of dam
Birth Weight
Authors have reported effects of various embryo transfer technologies on birth weight.[1][2][3][4] Literature indicates that birth weight can vary according to whether the embryo was produced using in vivo or in vitro (IVF) fertilization, the type of medium used and incubation process (e.g., oxygen tension). In one study the calves produced using IVF were 10% heavier than calves born from artificial insemination.[5]. In another report, relatively small differences in the length of the incubation period had a significant impact on birth weight of calves.[6] There are even reports that the oxygen tension of the incubator can have an effect on birth weight.[NEED CITATION HERE].
In an ideal world, capturing data on these variables would permit the utilization of birth weight data for genetic evaluation. However, the number of variables and the complexity of collecting and recording these data are likely infeasible to reliably allow the use of birth weight and calving ease observations from ET calves. The literature also indicates that these effects have not been detected in traits measured later in life.
Model for genetic evaluations
Traits with maternal effects
Traints without maternal effects
Citations
- ↑ Behboodi, E., G.B. Anderson, R.H. BonDurant, S.L. Cargill, B.R. Kreuscher, J.F. Medrano and J.D. Murray. 1995. Birth of large calves that developed from in vitro-derived bovine embryos. Theriogenology v44 p227-232.
- ↑ Numabe T., Oikawa T., Kikuchi T. and Horiuchi T. 2000. Birth weight and birth rate of heavy calves conceived by transfer of in vitro or in vivo produced bovine embryos. Animal Reproduction Science, 64 (1-2), pp. 13-20.
- ↑ H. Jacobsen, M. Schmidt, P. Holm, P.T. Sangild, G. Vajta, T. Greve, H. Callesen. 2000. Body dimensions and birth and organ weights of calves derived from in vitro produced embryos cultured with or without serum and oviduct epithelium cells. Theriogenology, v53, Issue 9 p1761-1769. ISSN 0093-691X. https://doi.org/10.1016/S0093-691X(00)00312-5.
- ↑ Luiz Sergio Almeida Camargo, Celio Freitas, Wanderlei Ferreira de Sa, Ademir de Moraes Ferreira, Raquel Varela Serapiao, João Henrique Moreira Viana. 2010. Gestation length, birth weight and offspring gender ratio of in vitro-produced Gyr (Bos indicus) cattle embryos/ Animal Reproduction Science. Volume 120, Issues 1–4, p10-15. ISSN 0378-4320. https://doi.org/10.1016/j.anireprosci.2010.02.013.
- ↑ A.M van Wagtendonk-de Leeuw, B.J.G Aerts, J.H.G den Daas. 1995. Abnormal offspring following in vitro production of bovine preimplantation embryos: A field study. Theriogenology. Volume 49, Issue 5, p883-894. ISSN 0093-691X.https://doi.org/10.1016/S0093-691X(98)00038-7.
- ↑ Yong-Soo Park, So-Seob Kim, Jae-Myeoung Kim, Hum-Dai Park, Myung-Dae Byun. 2005. The effects of duration of in vitro maturation of bovine oocytes on subsequent development, quality, and transfer of embryos. Theriogenology. Volume 64, Issue 1, Pages 123-134. ISSN 0093-691X. https://doi.org/10.1016/j.theriogenology.2004.11.012.
