Final answer:
The best option for a calf that hasn't received colostrum in the first 24 hours is a colostrum replacer, which provides essential immunoglobulins to help boost the calf's immune system(option b).
Step-by-step explanation:
When a high-value calf doesn't receive any colostrum in the first 24 hours of life, the best option to support its health is to provide a b)colostrum replacer.
Colostrum is vital in the first few days postpartum because it is packed with immunoglobulins, which are crucial for the calf's immune system, protecting the newborn from pathogens in a nonsterile environment. An effective colostrum replacer is specially formulated to substitute natural colostrum, supplying the necessary immunoglobulins and nutrients.
The importance of colostrum to a newborn is mainly that it helps boost the newborn's immune system. Offering intravenous fluids, antibiotics, or Lactated Ringer's solution does not replace the specific immune and nutritional benefits provided by colostrum.