Fig 1.
Trends (daily least square means) in concentrations of milk urea across lactation in primiparous and multiparous cows.
Fig 2.
Variance components (A) and heritability (B) of MU in primiparous and multiparous cows.
Phenotypic variance in primiparous (PP), phenotypic variance in multiparous (PM), permanent environmental variance in primiparous (PeP), permanent environmental variance in multiparous (PeM), genetic variance in primiparous (GP), genetic variance in multiparous (GM).
Fig 3.
Correlation estimated in daily basis between MU and productive traits included in primiparous and multiparous cows within DIM.
Phenotypic correlation in primiparous (A) and multiparous (B), permanent environmental correlation in primiparous (C) and multiparous (D), genetic correlation in primiparous (E) and multiparous (F) cow.
Table 1.
Mean, minimum, maximum, and CV for MU, and milk production traits in primiparous (n = 51,345 test-day records on 7,850 lactations) and multiparous (n = 39,249 test-day records on 4,358 lactations) cows.
Table 2.
Phenotypic, permanent environmental, and genetic correlations between MU and milk yield and compositions in primiparous and multiparous cows.