Colostrum quality varies, even on well-managed farms, which raises a practical question: what is the best use of a low-IgG batch? A University of Guelph trial (Lopez et al., 2023, Journal of Dairy Science) explored this in 80 newborn Holstein calves. Calves fed low-quality maternal colostrum (30 g IgG/L) averaged 11.8 mg/mL serum IgG at 24 hours, and 18.75% had failure of passive transfer (FPT). When the same colostrum was enriched to 60 g IgG/L with a bovine colostrum replacer, serum IgG rose to 19.9 mg/mL and no calves in the group had FPT. Apparent efficiency of absorption showed only a non-significant downward trend, and abomasal emptying stayed within the range seen in calves fed high-quality colostrum. However, enriching colostrum that was already adequate (60 to 90 g IgG/L) did not significantly increase serum IgG and reduced absorption efficiency, likely due to the meal's higher osmolality. Together, these findings position enrichment as an effective strategy for improving low-quality colostrum rather than boosting colostrum that is already adequate, reinforcing a simple principle for early life calf care: test first, then enrich where it counts.
SCCL supplied the colostrum and colostrum replacer for this study
