Genetic relationships between persistency and reproductive performance in first-lactation Canadian holsteins

Journal of Dairy Science
B L MuirL R Schaeffer

Abstract

The main objective of this study was to estimate genetic relationships between lactation persistency and reproductive performance in first lactation. Relationships with day in milk at peak milk yield and estimated 305-d milk yield were also investigated. The data set contained 33,312 first-lactation Canadian Holsteins with first-parity reproductive, persistency, and productive information. Reproductive performance traits included age at first insemination, nonreturn rate at 56 d after first insemination as a virgin heifer and as a first-lactation cow, calving difficulty at first calving and calving interval between first and second calving. Lactation persistency was defined as the Wilmink b parameter for milk yield and was calculated by fitting lactation curves to test day records using a multiple-trait prediction procedure. An 8-trait genetic analysis was performed using the Variance Component Estimation package (VCE 5) via Gibbs sampling to estimate genetic parameters for all traits. Heritabilities of persistency, day in milk at peak milk yield and estimated 305-d milk yield were 0.18, 0.09 and 0.45, respectively. Heritabilities of reproduction were low and ranged from 0.03 to 0.19. The highest heritability was for age at fir...Continue Reading

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Citations

Nov 8, 2011·The Journal of Dairy Research·Rúsbel R Aspilcueta-BorquisHumberto Tonhati
Apr 20, 2013·Animal : an International Journal of Animal Bioscience·K HagiyaM Suzuki
Nov 7, 2009·Genetics, Selection, Evolution : GSE·Klara L Verbyla, Arunas P Verbyla
Nov 16, 2013·Animal : an International Journal of Animal Bioscience·K HagiyaM Suzuki
Aug 6, 2015·The Journal of Dairy Research·Rodrigo Junqueira PereiraLucia Galvão de Albuquerque
Apr 11, 2015·Frontiers in Genetics·Eva M StruckenGudrun A Brockmann
May 21, 2005·Journal of Dairy Science·J JamrozikL R Schaeffer
May 19, 2009·Journal of Dairy Science·K Togashi, C Y Lin
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Dec 6, 2007·Reproduction in Domestic Animals = Zuchthygiene·H DobsonIm Sheldon
Aug 1, 2008·Animal : an International Journal of Animal Bioscience·O M OnyiroS Brotherstone
Aug 1, 2008·Animal : an International Journal of Animal Bioscience·H DobsonR F Smith
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Sep 8, 2020·The Journal of Dairy Research·Subrata Koloi, Ajoy Mandal
Dec 17, 2010·Tropical Animal Health and Production·Shahin Eghbalsaied
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