Location: Genetics and Animal Breeding
Title: Use of advanced reproductive technologies and inclusion of these records in genetic evaluationAuthor
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Submitted to: Beef Improvement Federation Proceedings
Publication Type: Proceedings Publication Acceptance Date: 5/17/2021 Publication Date: 7/1/2021 Citation: Thallman, R.M., Snider, A.P. 2021. Use of advanced reproductive technologies and inclusion of these records in genetic evaluation. In: Proceedings of the Beef Improvement Federation Symposium, June 22-25, 2021, Des Moines, Iowa. p. 42-50. Interpretive Summary: Embryo transfer (ET) is an important tool for genetic improvement of cattle. Most of the performance records of the millions of seedstock cattle produced by embryo transfer over the past 50 years have been excluded from national genetic evaluations. A topic entitled “Embryo Transfer: Data Collection and Utilization” was recently added to the Beef Improvement Federation Guidelines to provide recommendations on the utilization in genetic evaluation of records of cattle produced by embryo transfer. Background information on the use of embryo transfer in cattle breeding, various forms of ET and terminology used to describe them, and their relative advantages and disadvantages are provided. Based on this background, the rationale behind the recommendations in the current BIF Guidelines is explained. To the extent feasible, records of cattle produced by ET should be included in genetic evaluation but records produced using certain variants of ET should be excluded. The reasons for those exclusions are explained and actions that could allow more records to be included in future genetic evaluations are proposed. Technical Abstract: Most of the performance records of the millions of seedstock cattle produced by embryo transfer over the past 50 years have been excluded from national cattle evaluation (NCE). A topic entitled “Embryo Transfer (ET): Data Collection and Utilization” was recently added to the BIF Guidelines to provide recommendations on the utilization in genetic evaluation of records of cattle produced by embryo transfer. Here, we provide background information on the use of embryo transfer in cattle breeding, various forms of ET and terminology used to describe them, and their relative advantages and disadvantages. Based on this background, we explain the rationale behind the recommendations in the current BIF Guidelines. We also discuss a few topics related to ET, but not addressed in the current Guidelines and propose actions that could allow records of additional ET cattle to be included in future genetic evaluations. |
