Heifer rearing encompasses the period from birth to first calving, typically 24-28 months in dairy systems. Welfare during this period profoundly affects lifelong productivity, health, and wellbeing. Poor early-life experiences have lasting consequences — making investment in heifer welfare economically as well as ethically sound.
Adequate colostrum intake within the first hours of life is critical for passive immunity transfer. Failure of passive transfer (FPT) occurs when immunoglobulin levels are insufficient and leads to increased disease susceptibility, poorer growth, and higher mortality. Best practice: at least 3-4 litres of good quality colostrum within 6 hours of birth.
Traditional low-milk feeding programmes (4 litres/day) restrict growth and cause chronic hunger. Research supports enhanced nutrition (6-8 litres/day or ad libitum) for improved growth, health outcomes, and long-term production. Weaning should be gradual to reduce stress and rumen development disruption.
Individual housing is commonly used for disease control but restricts natural social behaviour. Pair housing and small-group housing improve social development, learning, and wellbeing without increasing disease risk if managed well. Group housing with good biosecurity is a viable alternative to individual hutches for older calves.
Disbudding (removing horn buds) is a painful procedure. Best practice requires effective local anaesthesia, sedation, and post-operative analgesia. Pain is multidimensional and long-lasting; inadequate pain management is a significant welfare concern. Horn bud removal should occur as early as possible (under 2 months) to minimise invasiveness.
Heifers should reach target weight and body condition before first service. Overconditioning increases calving difficulty; underconditioning delays puberty and impairs first lactation performance. Age at first calving (24-26 months) should be achieved without compromising animal welfare or reproductive health.