Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Genomic and phenotypic selection indices for decreased birth weight, shortening fattening period, and regulating total weight gain in beef cattle

  • Received : 2024.03.22
  • Accepted : 2024.07.01
  • Published : 2025.02.01
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Abstract

Objective: This study aimed to develop genomic and phenotypic indices for beef cattle selection that afford progeny with reduced birth weight and fattening period. The indices should also allow regulating total weight gain during the fattening period and avoid marked increases of inbreeding. Methods: Whether addition of constraint on total weight gain to constraints on body weight gain at up to four specific time points during the fattening process was effective for the weight gain until the end of the fattening period was examined in two selection indices with the selection trait being a phenotypic or a genomic breeding value random regression coefficient. Results: Both indices afforded cattle with desired weight gains at specific time points and desired total weight gains. One cycle of index-based selection made it possible to shorten the fattening period two weeks compared with that before selection while maintaining the same final fattening weight as before selection. The impact of constraining total weight gain was smallest when the number of weight gain constraints at specific time points was three or four. However, constraining total weight gain was necessary to avoid poor total weight gain when the number of weight gain constraints at specific time points was only one or two. Conclusion: The developed indices make it possible to regulate total weight gain during the fattening process and to achieve desired weight gains at specific time points. Importantly, the indices bring about genetic improvement without an excessive increase of inbreeding. Thus, we expect that these indices will contribute to sustainable genetic improvement in cattle while maintaining genetic diversity.

Keywords

Acknowledgement

K. Togashi thanks the staff members of the Livestock Improvement Association of Japan for their generous support; Drs. J.E.O. Rege and H.A. Fitzhugh, Jr., for their support and advice while K. Togashi was in Addis Ababa, Ethiopia; Dr. K. Hammond for the support and advice provided while K. Togashi was in Armidale, Australia. K. Togashi also thanks Drs. C.Y. Lin and K. Yokouchi for their enthusiastic support while they were in Sapporo.

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