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https://hdl.handle.net/1959.11/18728
Title: | Using random regression models to optimize selection for yield, persistency and calving interval in Philippine dairy buffaloes | Contributor(s): | Flores, Ester B (author); Van Der Werf, Julius H (author) | Publication Date: | 2014 | Handle Link: | https://hdl.handle.net/1959.11/18728 | Abstract: | Eigenvalue (EV) decomposition of the genetic coefficient matrix from random regression analysis of milk test day yields in Philippine dairy buffaloes provided independent variables for use in selection. The 1st, 2nd and 3rd EVs explain 80.3%, 18.8% and 0.2% of the total genetic variance, respectively. Selection on the 2nd eigenvalue resulted in higher response in the latter half of lactation, thus better persistency. There was a 5% reduction in milk yield (MY), 5.6% higher net economic gain and improvement in persistency from 0.62 to 0.79 with an optimal index relative to selection on total lactation. There was also a high genetic correlation between calving interval (CI) and the 2nd EV for MY. As CI is mostly correlated with MY in late lactation, this suggests CI is mainly associated with lactation length and may not be a true measure of fertility. | Publication Type: | Conference Publication | Conference Details: | WCGALP 2014: 10th World Congress on Genetics Applied to Livestock Production, Vancouver, Canada, 17th - 22nd August, 2014 | Source of Publication: | Proceedings of the 10th World Congress on Genetics Applied to Livestock Production (WCGALP) (Genetics of Trait Complexes: Lactation (Posters)), p. 1-3 | Publisher: | American Society of Animal Science | Place of Publication: | Champaign, United States of America | Fields of Research (FoR) 2008: | 070201 Animal Breeding | Fields of Research (FoR) 2020: | 300305 Animal reproduction and breeding | Socio-Economic Objective (SEO) 2008: | 830399 Livestock Raising not elsewhere classified | Socio-Economic Objective (SEO) 2020: | 100407 Insects | Peer Reviewed: | Yes | HERDC Category Description: | E1 Refereed Scholarly Conference Publication | Publisher/associated links: | https://asas.org/docs/default-source/wcgalp-posters/609_paper_8838_manuscript_272_0.pdf |
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Appears in Collections: | Conference Publication |
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