Colostrum replacement with 300 g of IgG does not result in excellent transfer of passive immunity in dairy calves
New standards for passive immunity in dairy calves from U.S. dairy operations recommend serum IgG concentrations of ≥ 25 g/L in at least 40% of the calves. To achieve this serum IgG level from maternal colostrum (MC), a single feeding of 300 g of IgG within 2 h or 400 g in multiple feedings within 24 h is recommended. However, similar recommendations do not exist when colostrum replacers (CR) need to be used. The objective of this study was to determine if feeding dairy calves 300 g of IgG by 2 different colostrum replacement protocols resulted in excellent transfer of passive immunity (serum IgG > 25 g/L).
Authors
- Thomas Passler (ORCID: https://orcid.org/0000-0002-9163-3190)
- Shollie M. Falkenberg (ORCID: https://orcid.org/0000-0002-9305-6307)
- Stephen Taylor (ORCID: https://orcid.org/0000-0002-3559-4334)
- Óscar Huertas (ORCID: https://orcid.org/0000-0003-2415-8972)
- J. R. Stockler
- Manuel F. Chamorro (ORCID: https://orcid.org/0000-0002-4155-5323)
- Miguel Saucedo (ORCID: https://orcid.org/0000-0003-4496-5990)
- Jenna E. Bayne (ORCID: https://orcid.org/0009-0008-6751-7190)
Institutions
- Auburn University (US)
Publication Details
- Journal
- American Association of Bovine Practitioners Conference Proceedings
- Published
- 2025-03-26
- DOI
- https://doi.org/10.21423/aabppro20249172
- Primary Topic
- Animal health and immunology
- Type
- article
- Field-Weighted Citation Impact
- 0.00