Table 6 Risk factors associated with the incidence of all-cause morbidity and mortality in lamb under three months of age in multivariable Cox proportional hazard regression model

Lamb sex (Male/Female)

0.265

0.000^b

0.137–0.510

–

a

–

Birth weight (kg) (≤2/2–2.5/2.6–3/3.1–3.5/≥3.6)

1.418

0.003^b

1.127–1.784

0.379

0.000^b

0.257–0.557

Lambing difficult (Yes/No)

–

a

–

4.926

0.047^b

1.024–23.700

Dams’ parity

–

a

–

0.223

0.007^b

0.075–0.668

Umbilical care (Yes/No)

0.473

0.028^b

0.243–0.921

–

a

–

Method of colostrum feeding (Suckling/Hand feed/Not feeding)

3.158

0.000^b

2.202–4.528

3.206

0.000^b

1.900–5.407

Time of colostrum feeding (<  6 h/ 6-12 h/12 hrs)

0.251

0.000^b

0.138–0.457

4.023

0.012^b

1.361–11.887