Backgrounding — the stocker or growing phase between weaning and feedlot entry — is a transition period with specific welfare considerations often overlooked relative to feedlot and cow-calf phases. Calves during this period are immunologically vulnerable, nutritionally adapting, and experiencing the accumulated stresses of weaning, transport, and commingling.
Backgrounding calves — typically 180-320 kg — are grazed on pasture or hay/grain rations for 60-180 days before reaching feedlot entry weight. This phase can occur on the farm of origin, on specialist backgrounding operations, or directly as "short-kept" calves in some feedlot systems. The variability in management quality is enormous.
Newly received stocker calves face elevated bovine respiratory disease (BRD) risk from the combined stresses of weaning, transport, commingling, and diet change. This is sometimes called "shipping fever" — the culmination of multiple stressors leading to immunosuppression and respiratory infection. Welfare-positive receiving management includes:
Preconditioning — vaccinating, weaning, castrating, and dehorning calves 30-45 days before sale — significantly reduces stress accumulation at the critical receiving period. Preconditioned calves have lower BRD morbidity and mortality, better growth performance, and better welfare outcomes than calves that experience multiple stressors simultaneously at the sale barn or feedlot.
Despite the welfare and economic benefits of preconditioning, adoption remains incomplete — many calves are sold unweanedand unvaccinated, experiencing weaning, transport, commingling, and vaccination all within days. Incentive programs that pay premiums for preconditioned calves drive welfare improvement.
Stocker calves on good pasture have high positive welfare potential — adequate space, natural behaviors, appropriate social grouping, and low disease pressure. Degraded pastures with inadequate forage, poor water access, or excessive parasite burden represent welfare failures. Regular parasite monitoring and strategic anthelmintic use improve welfare and production outcomes.
The transition from pasture-based backgrounding to feedlot creates another welfare transition — diet change, regrouping, confinement, and again BRD risk. Gradual diet step-up protocols reducing rumen acidosis risk and careful health monitoring during the receiving period at feedlots are welfare priorities for this transition.