Genetic relationships among longevity, milk production, and type traits in Swiss Brown cattle
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Genetic parameters for yield, fitness, and type traits in US Brown Swiss dairy cattle
2018, Journal of Dairy ScienceCitation Excerpt :The near-zero genetic correlations between yield traits and SCS in the current study were different than in some other literature, which reported that increased yield results in an elevated SCS in both Holsteins (Rupp and Boichard, 1999) and Brown Swiss (Samoré et al., 2010). Genetic correlations between yield traits and productive life were consistent with findings for Brown Swiss in Switzerland (Vukašinović et al., 1995) when herd life was unadjusted for yield, indicating that cows with higher yield were able to avoid voluntary culling. Days open had the lowest heritability of any trait in the analysis, consistent with estimates of <0.05 in Holsteins (Dematawewa and Berger, 1998; Dechow et al., 2004) and an estimate of 0.06 in Italian Brown Swiss (Tiezzi et al., 2011).
Comparison between sire-maternal grandsire and animal models for genetic evaluation of longevity in a dairy cattle population with small herds
2013, Journal of Dairy ScienceCitation Excerpt :Cows in the validation data set came from larger herds (≥10 cows per HY class) and were second-crop progeny of 63 sires. To focus on functional rather than true longevity, the effect of (relative) milk production was included to correct for culling due to low production, which is the major source of voluntary culling (e.g., Vukasinovic et al., 1995; Dürr et al., 1999). This effect was modeled through the definition of time-dependent groups mj(ti) with j (1 to 10) classes on peak milk yield m (defined as the highest value out of the first 2 milk recordings within the first 120 d of lactation).
A genome scan for quantitative trait loci affecting body conformation traits in Spanish Churra dairy sheep
2011, Journal of Dairy ScienceCitation Excerpt :In dairy cattle, body conformation traits are considered in breeding schemes as indicators of longevity because of moderate positive correlations between traits. Type traits, especially those describing feet and leg conformation, have been reported to show positive correlations with functionally productive life (Vukasinovic et al., 1995; Caraviello et al., 2004). Stature and body depth may influence feed intake and thus milk production in lactating animals (Veerkamp, 2002; Barillet, 2007).
Quantitative trait loci mapping of functional traits in the german Holstein cattle population
2003, Journal of Dairy ScienceGenetic relationships between lifetime profit and type traits in spanish Holstein cows
2002, Journal of Dairy Science