Fig. 7

Correlation between body weight and probability of fetal age exceeding the gestation length (G90) threshold of 250 days, i.e., 278 days—10%, where 278 is the overall median gestation length for Holstein cattle. The figure shows the median, 3rd quartile, 95th percentile, 99.5th percentile and maximum based on the data presented in Table 1. The 95% confidence interval (CI) (shaded) is shown only for the median (red) and 99.5th percentile (blue). The figure can be used to predict the probability of a Holstein fetus with a given body weight exceeding the G90 threshold based on a median GL of 278 days. For example, if a fetus has a body weight of 35 kg, the probability of the fetus exceeding G90 is 0.93 (95% CI 0.83–1.00) based on the median, and 0.37 (95% CI 0.19–0.54) based on the 99.5th percentile