Heritability of Herd-life and Relationship between herd-life and Milk Production, Type and Fertility Traits of Holstein Cows in Japan

Abstract

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Estimation of genetic parameters for longevity traits in dairy cattle: A review with focus on the characteristics of analytical models

“…HL is estimated based on the age of culling up to 84 months of age or the end of the fifth lactation period. In contrast, Hagiya et al (2002) and Fujita and Suzuki (2006) reported that HL and PL were positively correlated with fore-udder attachment and udder depth, and were negatively correlated with rump angle, using data from the same region. Kawahara et al (1996) estimated the genetic parameters of longevity traits (HL, PL, number of lactations and stay ability).…”

“…Longevity traits were negatively correlated with body capacity, body depth, rump width and strength. In contrast, Hagiya et al (2002) and Fujita and Suzuki (2006) reported that HL and PL were positively correlated with fore-udder attachment and udder depth, and were negatively correlated with rump angle, using data from the same region. Hagiya et al (2012a) suggested that the genetic correlations between HL and other traits (productive traits, angularity, and udder cleft) vary with birth year.…”

“…; Tsuruta et al . ; Fujita & Suzuki ). Longevity traits were highly genetic, and correlated with milk yield, fat yield, protein yield (correlation range: 0.54–0.85) and profit (0.46–0.50; Jairath et al .…”

“…The genetic correlations between longevity traits and milk yield were -0.11-0.84, those between longevity and fat yield were -0.17-0.76, and those between longevity and protein yield were -0.12-0.81 (Kawahara et al 1996;Vollema & Groen 1997;Weigel et al 1997;Hagiya et al 2002;Tsuruta et al 2004;Fujita & Suzuki 2006). Longevity traits were highly genetic, and correlated with milk yield, fat yield, protein yield (correlation range: 0.54-0.85) and profit (0.46-0.50; Jairath et al 1994).…”

Genetic correlations between the cumulative pseudo-survival rate, milk yield, and somatic cell score during lactation in Holstein cattle in Japan using a random regression model

“…The genetic correlation between longevity and milk yield varies among studies. Previous studies have reported that the genetic correlation between longevity and milk yield is positive (Haile-Mariam et al, 2003;Holtsmark et Pritchard et al, 2013), negative (González-Recio and Alenda, 2007;Onyiro et al, 2008;Tokuhisa et al, 2014), or weak (Tsuruta et al, 2005;Fujita and Suzuki, 2006;Hagiya et al, 2012b). These differences suggest that the genetic correlation between longevity traits and milk yield is dependent on the conditions of individual populations.…”