The rearing of dairy heifers from birth to first calving represents a 24-month investment in animal welfare and future productivity. Evidence consistently demonstrates that welfare during rearing — particularly in the first weeks of life — has lasting effects on lifetime health, production, and wellbeing. Optimising rearing welfare pays dividends across the cow's entire productive life.
Neonatal Period (0–2 weeks)
The neonatal period carries the highest mortality risk. Essential welfare management includes:
- Adequate colostrum intake: 4L in first 2 hours, 2L by 6 hours; Brix refractometer target ≥22°
- Navel disinfection with 7–10% iodine within 30 minutes of birth
- Temperature: calves are born unable to thermoregulate — deep bedding and calf jackets in cold conditions (<10°C)
- Individual housing in clean pens for first 2–3 weeks reduces pathogen exposure during the immunological gap period
Milk Feeding and Weaning
Calves fed high volumes of milk (≥6L/day) show better growth rates, immune development, and lifetime milk production compared to restricted feeding (4L/day). The key challenge is weaning transition:
- Gradual weaning over 2+ weeks reduces weaning stress compared to abrupt weaning
- Calves must be eating ≥1kg starter concentrate/day before weaning begins
- Water must be available from day 1 — water-sufficient calves consume more dry feed
Social Housing
Research consistently shows pair or group housing from 1–2 weeks of age provides welfare benefits — better social development, reduced fear, improved learning, and faster adaptation to milking herd. Paired calves are easier to wean and show less post-weaning stress. Transition from individual to group housing requires careful hygiene management.
Key Health Priorities
- Diarrhoea (scours) prevention: adequate colostrum, clean environment, group hygiene management; treatment requires electrolyte support and veterinary guidance
- Respiratory disease: good calf-level ventilation (natural or mechanical); avoid overcrowding; early detection and treatment
- Vaccination programme developed with vet: RSV, IBR, and Pasteurella vaccines at appropriate ages
Monitoring and Growth
Regular weight measurement (target daily liveweight gain 0.8–1.0 kg/day) identifies underperforming animals early. Height measurement provides additional growth monitoring. Body condition scoring throughout rearing ensures heifers are on target for calving at appropriate BCS (3.0–3.25 in UK scale) and body weight (target 90% of mature cow weight at first calving).