Genetic parameters and evaluations from single- and multiple-trait analysis of dairy cow fertility and milk production

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Effect of sire, age at first calving, season and year of calving and parity on reproductive performance of Friesian cows under semiarid conditions in Egypt. (2010, background): “Kassab and Salem (1993) reported highly significant effect of parity on FSP.”
Genetic correlations among body condition score, somatic cell score, milk production, fertility and conformation traits in dairy cows (2004, background): “Furthermore, the unfavourable effects of selection on milk production traits in early lactations may have an impact on fertility in later lactations (Kadarmideen et al., 2003).”
Selection indices in Holstein cattle of various countries. (2005, background): “Several studies have shown that selection for production alone causes negative effects on udder health (Heringstad et al., 2003) and reproductive performance (Veerkamp et al., 2001; Haile-Mariam et al., 2003; Kadarmideen et al., 2003).”