Colostrum insulin supplementation does not influence immunoglobulin G absorption in neonatal Holstein bulls

Abstract

Graphical Abstract Summary: We enrolled 48 neonatal Holstein bulls to evaluate how linear increases in colostrum insulin concentration (from 12.9 to 149.7 μg of insulin/L) would influence immunoglobulin G (IgG) absorption in neonatal calves. At 2, 14, and 26 hours postnatal, calves were fed nonsupplemented colostrum or colostrum that had been supplemented with insulin and we analyzed serum IgG concentration at 0, 30, 60, 90, 120, 180, 240, 360, 480, and 600 minutes relative to the first and second meal. Colostral insulin concentration did not affect IgG absorption.