Genetic components of days open under heat stress

Journal of Dairy Science
S OseniR Rekaya

Abstract

A reaction norm approach was used to estimate the genetic parameters of days open (DO) with a model that accounted for heat stress. Data included DO records for Georgia, Tennessee, and North Carolina in the Southeastern United States. A fixed effect model included herd-year, month of calving (MOC), age of cow, and a regression on 305-d milk yield. The reaction norm model additionally included the effect of animal with random regression on a heat stress index (HI), calculated as the standardized solutions to MOC derived from the fixed effect model; the residual variance was assumed to be a function of the HI. The shape of the distribution of the HI was close to a sinusoidal function with the highest value in March/April and the lowest value in September. Genetic and residual variances and heritabilities were highest for spring calvings and lowest for fall calvings. The variance associated with the random regression of the highest level of HI was 33% of the genetic variance of the regular animal genetic effect. Genetic correlation between these effects was 0.67. As a validation, DO data were grouped into 4 seasons of calving and treated as different traits. A 4-trait mixed linear model that included the fixed effects listed above...Continue Reading

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Dec 16, 2003·Journal of Dairy Science·S OseniR Rekaya

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Citations

Jan 26, 2008·Journal of Dairy Science·C HuangJ S Clay
Aug 25, 2009·Journal of Dairy Science·M PszczolaI Misztal
Jan 26, 2016·Journal of Dairy Science·Ahmed IsmaelPeter Løvendahl
Jul 11, 2012·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·A Menéndez-BuxaderaJ M Serradilla
Apr 4, 2019·Tropical Animal Health and Production·Saeid Ansari-MahyariLuiz F Brito

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