... available data pertain to three random variables: two quantitative (e.g., calf’s birth weight and dam’s pelvic opening) and one binary (e.g., easy vs difficult calving) Let the data for birth weight and ... be a non-linear function of genetic and non -genetic variables (sire, breed, herd-year) and may also depend on quantitative response variates A possible course of action in the analysis of this ... pelvic opening and season of calving, sex and birth weight of the calf, and calving difficulty score (1: normal birth, 2: slight assistance, 3: assisted, 4: mechanical aid, and 5: cesarean) For the...