Hypogammaglobulinemia predisposing to infection in foals.

The research study investigates the cause and effects of low serum immunoglobulin levels, known as hypogammaglobulinemia, in foals less than 2 weeks old, attributing it to insufficient transfer of immunoglobulins from the mother horse to their offspring through colostrum. The inadequate levels lead to a susceptibility of infections, affecting growth and overall health of the foal.

Identification of Hypogammaglobulinemia in Foals

• The study began with the assessment of serum immunoglobulin levels in 46 foals that were less than two weeks old. This revealed that 9 of them suffered from hypogammaglobulinemia, a condition characterized by below-normal levels of immunoglobulins in the blood.
• The condition was identified to be caused by failure in the transmission of these crucial immunoglobulins from the mother (dam) to the foal via colostrum, which is the first form of milk produced immediately following the delivery of the newborn.

Effects of Hypogammaglobulinemia

• Three foals that did not nurse at all or only slightly experienced severe effects of hypogammaglobulinemia. Two of these foals died of infections only days after their birth. The third foal, which survived, did not grow as well as the normal foals, indicating the significant role of immunoglobulins in the health and development of newborn foals.
• Six foals, in spite of nursing in an apparently normal manner, also reportedly had hypogammaglobulinemia. Five of these six foals experienced nonfatal respiratory infections between their second and fifth week of age.

Transient Hypogammaglobulinemia

• The researchers discovered a case of transient hypogammaglobulinemia in one foal. This foal showed symptoms of simultaneous infections and hypogammaglobulinemia at 57 days of age. This age is usually when the foal should have produced ample amounts of immunoglobulin, regardless of the passive transfer from the dam.
• However, the foal eventually began producing normal amounts of immunoglobulin. Be that as it may, their cell-mediated immunity only reached normal levels when they were three months old.
• This led the researchers to determine that the foal’s temporary inability to manufacture immunoglobulins was responsible for these occurrences, hence, they classified this condition as transient hypogammaglobulinemia.