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Table 1 Variables included in additive Bayesian network analysis of the bovine respiratory disease-calf-management practices relationship.

From: Additive Bayesian network analysis of the relationship between bovine respiratory disease and management practices in dairy heifer calves at pre-weaning stage

Variable

Variable description

Definition

Summary statisticsa

(N = 3185)

Colostrum

Whether colostrum, including colostrum stored at freezer, was fed calf at the first suckling after birth at the original dairy farmb

Binomial

(1: Yes ,0: No)

2556 (80.3%)

Parity

Dam parity of calf

Binomial

(1:Multiparous , 0: Primiparous )

2292 (72.0%)d

TP

Concentration of total protein in serum taken at introduction (g/dl)

Continuous

6.00 (SD= 0.73)

Introduction weight

Body weight at introduction (kg)

Continuous

42.69 (SD= 5.32)

Season

Introduction seasons divided into four terms

Multinomial

(Autumn: September - November, Winter: December - February, Spring: March - May, Summer: June - August)

Autumn: 792 (24.9%), Winter: 809 (25.4%), Spring: 776 (24.4%), Summer: 808(25.4%)

BRD

Whether the calf contracted BRD until weaning after introductionc

Binomial

(1: Yes ,0: No)

1409 (44.2%)e

ADG

ADG of body weight from introduction to the nursery farm to weaning (kg/day)

Continuous

0.94 (SD= 0.24)

  1. TP total protein, BRD bovine respiratory disease, ADG average daily gain
  2. a Percentage of records selecting each value for binomial and multinomial variables and the mean with standard deviation for continuous variables
  3. b All of calves without colostrum feeding were fed replacer instead of colostrum
  4. c BRD records suspected to be prophylactic treatment were ignored
  5. d Number of calves born from multiparous dam
  6. e Number of calves contracted BRD until waning after introduction